Dab tsi yog Qhov Kev Sib Tw Tshiab Hauv Kev Tshawb Fawb Kev Txhim Kho ntawm Cov Khoom Siv Hluav Taws Xob Lithium

Vim muaj kev txwv ntawm lub zog lithium roj teeb thev naus laus zis, lub zog tshiab tsheb muaj ntau yam tsawg, lub neej luv luv (tsawg them thiab tawm lub sijhawm), thiab tus nqi attenuation siab, uas cuam tshuam cov kev siv loj ntawm cov tsheb tshiab. Tsis ntev los no, Kaus Lim Qab Teb thiab Nyij Pooj tau tshaj tawm kev ua tiav hauv cov khoom siv hluav taws xob lithium roj teeb, thiab tus nqi ntawm cov roj teeb lithium yuav txo qis rau yav tom ntej.

Ntawm 5th National Science thiab Technology Innovation Conference thiab 4th Power Energy Summit Forum, xibfwb Wu Feng los ntawm Beijing Institute of Technology thiab cov qhua tuaj koom tau qhia txog kev tshawb fawb txog cov roj teeb lithium thiab cov ntaub ntawv muaj feem xyuam.

Qhov kev thov tseem ceeb ntawm lub teb chaws tau txhawb txoj kev vam meej tshiab hauv kev tsim cov roj teeb lithium fais fab. Thaum ua kom muaj kev nyab xeeb, hom tshiab ntawm cov roj teeb lithium roj teeb uas muaj lub zog siab, lub zog siab, lub neej ntev, tus nqi qis, thiab tsis muaj kuab paug yog tsim kev lag luam thiab nkag mus rau hauv kev lag luam raws li cov neeg siv khoom sib txawv. Wu Feng tau hais tias kev sib koom ua ke thev naus laus zis ntawm nickel hydrogen roj teeb, lithium ion roj teeb, lub zog tshwj xeeb lub zog tshiab roj teeb thiab supercapacitor tseem ceeb heev. Qhov kev koom ua ke thev naus laus zis no nws tus kheej kuj yog kev tsim kho thev naus laus zis. Nws yuav qhib tshooj tshiab rau kev txhim kho cov roj teeb thib ob hauv Suav teb ua ke nrog Is Taws Nem!

Hauv kev tsim cov roj teeb lithium fais fab, cov teeb meem hauv qab no tau ntsib: puas tuaj yeem tsim lub cim tshiab ntawm lub zog tshwj xeeb roj teeb? Peb puas tuaj yeem daws cov teeb meem kev nyab xeeb thiab kev ntseeg siab ntawm cov roj teeb? Lub neej ntev ntawm lub roj teeb puas tuaj yeem ua tiav? Cov nqi-zoo ntawm cov roj teeb puas tuaj yeem txhim kho?

Nyob rau hauv 2015, lub zog ceev Performance index ntawm lub hwj chim lithium-ion roj teeb yog 120-180Wh/kg, thiab cov khoom tseem ceeb yog lithium hlau phosphate graphite thiab ternary graphite. Lub zog ceeb toom ntsuas ntawm lub zog hluav taws xob ntawm lub zog lithium-ion roj teeb hauv 2020 yog: Rich Lithium (250mAh / g) - Silicon Calldode: Roj teeb meem Cell 300Wh.

Kev txhim kho ntawm lub zog ceev hauv lub zog hluav taws xob lithium-ion roj teeb tsis yog tsuas yog cuam tshuam nrog cov khoom zoo thiab tsis zoo electrode, tab sis kuj xav tau ntau dua rau cov khoom siv electrolyte. Wu Feng tau hais tias siv NCM ternary zoo electrode cov ntaub ntawv thiab Si / C tsis zoo electrode cov ntaub ntawv, lub zog tshwj xeeb lithium-ion roj teeb nrog lub zog ceev ntawm 319Wh / kg tuaj yeem npaj tau.

Hais txog kev tshawb fawb kev nce qib ntawm cov khoom siv ntawm 300Wh/kg fais fab lithium roj teeb, Wu Feng tau hais tias qhov cuam tshuam ntawm cov ntsiab lus nickel divalent ntawm lithium nickel sib xyaw tshwm sim hauv cov khoom siv nickel ternary cathode siab. NCM811 tau kawm. Nws tau pom tias ntxiv qhov sib piv stoichiometric ntawm lithium tuaj yeem nce cov ntsiab lus ntawm divalent npib tsib xee hauv cov khoom, yog li txo cov lithium npib tsib xee sib xyaw hauv cov khoom thiab txhim kho kev ua haujlwm ruaj khov ntawm cov khoom siv. Tsis tas li ntawd, cov khoom siv nickel ternary cathode siab (LiNi0.7Co0.15Mn0.15O2) nrog kev loj hlob zoo tshaj ntawm 010 siv lead ua dav hlau tau npaj, thiab kev ntsuas electrochemical pom tias cov khoom siv tau zoo heev. Thiab tsim thiab tsim cov qauv kheej kheej hierarchical nrog electrochemical active nto kom zoo dua qhov kev loj hlob, txhim kho tus nqi cycling yam ntxwv thiab tus nqi kev ua tau zoo ntawm lithium nplua nuj manganese raws li cov ntaub ntawv rau lithium-ion roj teeb.

Hauv kev tshawb fawb ntawm cov khoom siv hluav taws xob tsis zoo, SiO / CNx cov khoom siv hluav taws xob tsis muaj binders tau tsim los ntawm cov txheej txheem txheej ncaj qha. Nitrogen uas muaj cov pa roj carbon mesh tuaj yeem cuam tshuam nws qhov ntim hloov pauv thaum lub caij tsheb kauj vab, tsim kom muaj kev sib txuas lus zoo ntawm SiO thiab muab cov channel ruaj khov rau kev xa hluav taws xob. Thiab Si / Ni / graphite composite cov ntaub ntawv tau tsim los siv lub zog siab pob milling txoj kev. Hlau Ni thiab graphite interlaced los tsim ib tug zoo conductive network, thiab nanocrystalline Si tau embedded nyob rau hauv situ nyob rau hauv lub SiOx matrix, kev txhim kho cov electrochemical kev ua si ntawm SiOx.

Kev tshawb fawb txog kev ua haujlwm electrolytes, tsim thiab tsim ib hom tshiab ntawm cov av nkos electrolyte uas muaj lithium silicate, uas txhim kho kev nyab xeeb thiab kev ruaj ntseg ntawm cov khoom siv high-voltage lithium-ion roj teeb cathode. Tsis tas li ntawd, kev nyab xeeb ua haujlwm electrolytes thiab additives tau tsim: imidazolinone, pyridine nplhaib ionic kua, thiab nplaim retardant phosphate additives tau ua ke nrog film-forming additives xws li butene sulfite los tsim ib tug series ntawm functional electrolyte systems nrog nplaim retardancy thiab electrochemical compatibility. , txhim kho kev nyab xeeb, kev cia siab, thiab kev hloov pauv kub ntawm lithium-ion roj teeb (txog qhov ntsuas kub ntawm -20 degree rau +60 degree rau -40 degree rau +80 degree ) . Thiab cov khoom siv hluav taws xob hauv lub xeev nrog lub mesoporous SiO2+ ionic kua network qauv, uas muaj lub qhov rais dav electrochemical, siab thermal stability, thiab chav tsev kub ionic conductivity ntawm 10-3S / cm, tau tsim, muab cov ntaub ntawv txhawb nqa los daws cov teeb meem kev nyab xeeb ntawm cov roj teeb uas muaj zog tshiab.

Ntxiv nrog rau kev tshawb fawb ntawm cov khoom siv roj teeb, cov roj teeb theem nrab tau nkag mus rau ntau yam kev lag luam hauv lub tebchaws thiab tib neeg lub neej. Kev tsim cov roj teeb tau nce zuj zus, ua rau muaj kev cuam tshuam loj heev ntawm ib puag ncig thiab cov peev txheej hauv zej zog. Raws li kev kwv yees kev muag khoom ntawm lub zog tshiab tsheb hauv Suav teb, qhov kev thov rau lub zog lithium roj teeb ib leeg yuav ncav cuag 30 billion watt teev hauv 2020, thiab qhov cuam tshuam tsis zoo rau ib puag ncig yuav hnyav zuj zus. Cov peev txheej lithium kuj tseem yuav tsawg zuj zus. Los ntawm kev siv ib puag ncig tus phooj ywg zoo organic acid rov qab thev naus laus zis, ntsuab thiab zoo rov qab cov roj teeb lithium-ion tau ua tiav (nrog lithium thiab cobalt leaching tus nqi ntawm 98% thiab 94% raws li), uas yog superior rau cov txheej txheem technology siv zog acids txawv teb chaws. thiab tiv thaiv cov pa phem thib ob hauv kev kho cov kua qaub uas muaj zog.

Kev nce qib hauv kev tshawb fawb thiab tsim cov ntaub ntawv tshiab rau cov roj teeb lithium fais fab

Peb cia siab tias yuav ua tiav cov txiaj ntsig zoo ntawm cov khoom siv, uas nyuaj heev rau peb. Los ntawm qhov kev xav ntawm lub tuam txhab, kev nyab xeeb, kev ntseeg siab, thiab tus nqi kev ntsuas tau muab tso rau hauv ib qho kev xav tau, ntawm cov kab hauv qab thiab cov ntsuas kev loj hlob mus sij hawm ntev heev. Tsoom fwv thiab lub xeev tau muab tso rau hauv siab heev zog ceev yuav tsum tau rau lub hwj chim lithium roj teeb. Rau cov haujlwm xws li lub zog tshiab tsheb thiab cov phiaj xwm tshawb fawb tau tshaj tawm xyoo no, nws cia siab tias lub zog ceev ntawm lithium-ion roj teeb tuaj yeem ncav cuag 400Wh / kg, thiab lub zog ceev ntawm cov qauv roj teeb tshiab tuaj yeem ncav cuag 500Wh / kg. Rau lub tuam txhab, 300Wh / kg kuj tsis yooj yim, thiab ntau lub tshuab tshiab yuav tsum tau tsim. Qhov yuav tsum tau ua ntawm "Ua hauv Tuam Tshoj 2025" yog kom ua tiav qhov hnyav ntawm 400wh / kg lossis siab dua, thiab tseem muaj qhov sib txawv tseem ceeb ntawm cov lus tseem ceeb hauv qee qhov kev thov, uas yog cov roj teeb.

Los ntawm qhov kev xav ntawm cov khoom ntsuas, cia peb sib piv cov kev xav tau ntawm ntau lub tebchaws. Tsuas yog hais tias "Made in China 2025", hauv qab no yog kev sib tw ntawm Nyiv thiab Tebchaws Meskas. Xyoo no, peb txoj haujlwm tshwj xeeb tau tsim tawm, tag nrho cov no suav nrog cov roj teeb lithium.

Txhua tus cia siab tias yuav ua tiav 400wh / kg yav tom ntej, vim li cas peb thiaj li teeb tsa qhov ntsuas no? Feem ntau yog vim kev saib xyuas kev nyab xeeb ntawm lithium-ion roj teeb. Noj BAIC Tshiab Zog EV200 ua piv txwv, nws lub zog noj ib 100 mais yog 14 kWh, thiab nws txoj kev ua neej nyob yog 10 xyoo thiab 200000 mais. Txawm li cas los xij, tam sim no tus nqi tau txo qis heev. Kev txhim kho yav tom ntej ntawm lub hwj chim lithium-ion roj teeb yuav ua rau muaj nqi ntau dua rau kev ua tiav qhov sib txawv piv rau cov xwm txheej tam sim no. Yog li ntawd, yog tias lub zog lithium-ion roj teeb ntawm lub tsheb hluav taws xob tsis txhim kho lub zog siab, lawv yuav ntsib kev sib tw ntau dua hauv cov tsheb fais fab yav tom ntej, thiab tej zaum yuav dhau los ntawm cov roj teeb hluav taws xob.

Los ntawm qhov kev xav ntawm kev tsim kho, tag nrho txoj kev loj hlob qeeb thiab ruaj khov. Qhov tseem ceeb tshaj plaws yog kev txhim kho thiab hloov cov cuab yeej technology thiab cov khoom siv. Txawm hais tias peb ua raws li txoj kev, yog tias peb tuaj yeem ua raws li kev txhim kho tam sim no, koj tuaj yeem ua tiav 300 watt teev ib kilogram los ntawm 2020 thiab 390 watt teev ib kilogram los ntawm 2030. Peb yuav ua li cas maj mam ua tiav txoj kev no? Qhov thib ob, peb puas tuaj yeem ua tiav 400 watt teev ib kilogram lossis ntau dua?

Cov kua electrolyte lithium-ion roj teeb tau tsim peb tiam, thiab xyoo tas los muaj cov ncauj lus kom ntxaws. Qhov tseem ceeb yog hais tias nyob rau hauv cov nqe lus ntawm zoo electrode cov ntaub ntawv, txhua tus yog upgraded thiab hloov, nce voltage los yog muaj peev xwm; Ib qho kev hloov pauv tseem ceeb hauv qhov tsis zoo ntawm electrode yog qhov kev taw qhia ntawm nano silicon carbon rau hauv cov electrolyte hauv cov roj teeb uas muaj zog, nrog rau qee cov tswv yim xws li ceramic coated separators. Lub roj teeb lithium-ion siab npaum li cas peb tab tom saib tam sim no ua tau? Tsawg zog ceev yog qhov zoo heev, nws txia rov ua dua tshiab, tsis hais txog kev nyab xeeb, thiab ua tiav lub zog siab. Txawm li cas los xij, nws tsis tau txhais hais tias kev rov ua dua tshiab tsis tuaj yeem txhim kho, tab sis nws yuav tsum muaj qee qhov kev tshawb fawb ntxaws thiab yooj yim. Qhov no yog lub tuam txhab tshawb fawb hauv Fabkis uas tau pom ntau thiab ntau cov kev xav ntawm cov ntaub ntawv. Tam sim no ntau pab pawg thiab cov npoj yaig tau paub txog nws, yog li kuv yuav tsis mus rau hauv kev nthuav dav.

Txawm li cas los xij, hais txog cov khoom siv roj teeb, muaj ntau yam teeb meem thiab kev ua tau zoo, thiab tsawg kawg yog 13 lossis ntau dua cov thev naus laus zis tau raug coj los siv los daws cov teeb meem no. Txhua lub xov hlau muaj ntau cov ncauj lus kom ntxaws thiab cov ntsiab lus. Thaum koj hloov cov khoom siv, tag nrho cov roj teeb yuav raug hloov pauv, thiab kev txhim kho ntawm cov khoom siv roj teeb no tshwj xeeb yog qeeb, feem ntau siv ntau tshaj kaum xyoo, Ntau pawg thiab tuam txhab lag luam twb tau tsim 300 watt teev ib kilogram lithium-ion roj teeb. Qhov teeb meem nyuaj tshaj plaws nyob rau hauv cheeb tsam no tam sim no yog qhov muaj peev xwm tsis zoo electrode ua rau muaj kev nthuav dav siab, uas yog qhov nyuaj heev rau koj los daws cov teeb meem ntawm cov roj teeb. Qhov teeb meem tseem ceeb yog yuav ua li cas los daws qhov ntim nthuav dav tom qab them nyiaj kom tau raws li cov kev xav tau ntawm cov tuam txhab roj teeb tam sim no. Tsis tas li ntawd, kev siv cov kev siv zog siab no tuaj yeem ua tau, tab sis lawv puas tuaj yeem nkag mus tau raws li cov ntawv thov? Kuv tsis paub meej tias qhov kev txwv sab saud yog dab tsi, tab sis muaj qee qhov kev daws teeb meem hauv nws. Peb yuav tsis tham txog lub sijhawm kev sib raug zoo hauv kev nthuav dav. Peb zoo siab tos txais txhua tus tuaj yeem muaj lub sijhawm los pauv cov cuab yeej technology hauv cheeb tsam no.

Tsis tas li ntawd, tsoomfwv yuav tsum tsim 400wh/kg thiab 500wh/kg. Tom qab kev xam, muaj ib tug qauv uas muaj xws li graphite tsis zoo electrode thiab silicon tsis zoo electrode hlau lithium. Yog tias nws nce mus txog 800 watts lossis ntau dua, tseem muaj sijhawm. Tseem muaj qee qhov kev daws teeb meem rau 400wh / kg thiab 500wh / kg, tab sis nws nyuaj heev kom ua tiav. NC tuaj yeem ncav cuag li 200, qhov tsis zoo lithium tuaj yeem ncav cuag 300, thiab cov khoom siv tsis zoo electrode sib txawv yuav tsum muaj kev suav nrog, Los ntawm kev xam pom, nws zoo li tseem muaj qee qhov zoo thiab tsis zoo electrode cov ntaub ntawv uas ua tiav qhov ntom ntom los ntawm kev sib txuam. Cov kev suav yav dhau los yog tag nrho cov virtual, thiab kev ua haujlwm ntawm Suav Academy ntawm Kev Tshawb Fawb hauv qhov no. Txhawm rau ntxiv dag zog rau kev tshawb fawb thiab kev txhim kho kev ua tiav, txhawb kev txhim kho kev lag luam, thiab daws cov teeb meem ua tau zoo, Suav Academy ntawm Kev Tshawb Fawb tau tsim lub tswv yim kev tsav tsheb A-chav kawm. Ib qho ntawm cov haujlwm no yog qhov project nanomaterials, uas yog lub hom phiaj los muab kev txhawb nqa rau nanotechnology tshawb fawb los ntawm Academy dhau 20 xyoo dhau los. Nws vam tias qhov no yuav pab tau rau kev lag luam. Thawj ntawm cov haujlwm no yog lub zog lithium roj teeb, thiab cov khoom siv nano thiab nanotechnology zoo li yuav raug siv.

Cov kev cai rau hom haujlwm no tau thov los ntawm Tus Lwm Thawj Coj Yin thiab Jun, uas yog thawj lub luag haujlwm rau txoj haujlwm no. Peb txoj haujlwm yuav tsum muaj cov hom phiaj meej, siv tau, thiab ntsuas tau. Tom qab kev ntsuam xyuas thib peb, muaj ntau qhov ntsuas los ntsuas qib ntawm cov khoom siv thiab cov cuab yeej siv, seb puas muaj kev cuam tshuam, thiab qhov cuam tshuam rau lub peev xwm. Yog li ntawd, hom phiaj xwm no nyuaj heev. Nws tau thov cov ntsuas tshwj xeeb, thiab lub teb chaws tau thov kom ua tiav 300 watt teev ib kilogram los ntawm 2020 thiab 150 watt teev ib kilogram los ntawm 2015. Kev lag luam ntawm cov khoom siv roj teeb, xws li zoo electrode electrolytes, separators, thiab lwm yam, yuav tsum pib. . Txhawm rau ua kom tiav qhov project no, ntau txoj haujlwm tseem ceeb tau teeb tsa. Ib qho yog txhawm rau faib 60% ntawm cov peev nyiaj mus rau 70% ntawm cov nqi khiav lag luam rau cov roj teeb lithium-ion, tsim cov hluav taws xob zoo thiab tsis zoo electrodes, hluav taws xob hluav taws xob hluav taws xob, thiab cov khoom siv hluav taws xob muaj kev nyab xeeb sib xyaw ua ke hauv cov roj teeb lithium-ion. Nyob rau lub sijhawm ntev, peb yuav tsum tau teeb tsa cov roj teeb hauv lub xeev, thiab cov roj teeb cua kuj tau npaj rau qhov no. Tsis tas li, tag kis no, Xib Fwb Chen tau hais txog qib kev xeem. Tseem muaj qee qhov kev xeem hauv Suav teb, tab sis ob lub platform tau tsim. Cia kuv qhia luv luv txog qhov tshwm sim. Muaj 12 chav nyob nrog pab pawg tshawb fawb thiab txhim kho ntawm kwv yees li 300 tus neeg, suav nrog ntau yam. Ib qho yog silicon tsis zoo electrode, thiab kuv tau ua haujlwm ntawm kev tshawb fawb thiab thev naus laus zis thiab kev txhim kho hauv cheeb tsam no tau 19 xyoo, uas yog qhov nyuaj heev. Kuv tau tsim qhov project no los ntawm kev pom ntawm daim ntawv thov tsis ntev los no, thiab cov kev qhia tseem ceeb suav nrog ob pawg: SiOx / C thiab Nano Si. Qhov tseem ceeb tshaj plaws yog kom tsis tu ncua iterate los ntawm cov kev qhia dav dav. Tom qab tau txais kev txhawb nqa hauv xyoo 2013, peb tuaj yeem ua tiav ib pawg loj ntawm 500 kilograms, uas yog tsim los ntawm kev xav txog kev tsim qauv. Qhov kuv tab tom qhia ntawm no yog qhov peb lub tswv yim tsis yog qhov tseeb. Nws tseem nyuaj heev rau import additives thiab lwm yam, thiab qhov nyuaj ntawm kev sib tham nano yog yuav ua li cas kom tau 100 yuan ib kilogram ntawm nano silicon.

Yuav ua li cas kom tusyees disperse nano silicon nyob rau hauv hais?

Qhov peb tab tom ua tiav tam sim no yog cov khoom siv uas disperses nano silicon rau hauv cov khoom thiab tuaj yeem nkag mus rau ntau lawm. Nyob rau hauv ib cov khoom ntawm 450 milliamperes ib teev, nws yog feem ntau ib tug high-muaj peev xwm load uas yuav cycled txog 500 zaug. Txawm li cas los xij, yav tas los tsim silicon oxide tseem tab tom txhim kho, tab sis qhov ua tau zoo yog tsawg thiab lub peev xwm ntawm nano silicon carbon tsis yog qhov kev daws teeb meem txaus siab. Yog li ntawd, peb tab tom tsim ib tiam tshiab ntawm silicon nplua nuj oxide cov ntaub ntawv, Txo cov kev cov nyom nws coj.

Lub tuam txhab khoom siv tshiab no tam sim no nyob rau qib thib peb lossis thib ob hauv Suav teb, uas daws cov teeb meem kev lag luam. Kuv yuav tsis mus rau hauv kom meej txog nws. Tau muaj kev vam meej hauv cov khoom siv electrode tsis zoo, tab sis peb tau sau me ntsis hauv cov ntaub ntawv zoo electrode. Tom qab kev txhawb nqa ntawm qhov project no, nws yog ib qho tseem ceeb uas yuav tsum tau tsom mus rau qib siab muaj peev xwm. Qhov nyuaj ntawm cov khoom no yog voltage attenuation. Hauv kev ua haujlwm no, nws yog ib qho tseem ceeb uas yuav tsum tau kho cov qauv saum npoo los daws qhov teeb meem ntawm qhov voltage attenuation. Yog li ntawd, nws tuaj yeem pib sim. Xyoo no, nws yog nyob rau theem ntawm 500 kilograms.

Lwm cov khoom siv yog high voltage spinel, uas yog ib qho yooj yim mus hloov dua. Qhov nyuaj tshaj plaws yog tias tom qab siv cov khoom siv no, cov khoom siv electrolyte thiab lwm yam yuav tsum tau hloov kho kom zoo, yog li qhov no tseem yuav tsum tau txhim kho, tshwj xeeb tshaj yog rau qhov teeb meem ntawm qhov kub thiab txias ntawm 55 degrees. Yuav kom daws tau qhov teeb meem ntawm high voltage lithium cov ntaub ntawv nplua nuj, qhov no yog qhov tseem ceeb heev thiab tseem nyuaj heev hauv Suav teb. Tam sim no, nws muaj peev xwm circulate kuj ruaj khov nyob rau hauv high voltage, thiab kuj muaj additives nyob rau hauv lub electrolyte. Peb xav tias kev siv cov khoom sib cais ncaj qha tseem muaj teeb meem me ntsis, yog li peb yuav tsum tsim cov khoom siv ceramic cais thiab siv cellulose ua substrate, uas tiv taus qhov kub thiab txias. Txawm li cas los xij, zoo li qhov no tsis tuaj yeem siv thaum kawg hauv peb cov roj teeb. Qhov tseem ceeb yog qhov sib xws thiab ruaj khov. Nws yog tam sim no nyob rau theem ntawm kev ntsuas me me mus rau nruab nrab, tab sis muaj qee qhov kev cia siab rau yav tom ntej. Qhov tseeb, peb kuj tau tsim ib qho ion conductive txheej cais nrog cellulose separator thiab ceramic hais.

Graphene tau tsim nyob rau lub sijhawm ntev, thiab cov txheej txheem txheej txheem tuaj yeem ua tiav qib ntau lawm ntawm kaum tawm tons. Lub roj teeb ua ntej tau tsim los siv tib yam khoom, uas tuaj yeem ua tiav 375 watt teev ib kilogram. Txawm li cas los xij, nws qhov kev rov ua dua tshiab tsis zoo, thiab nws lub peev xwm tsawg yog qhov zoo rau kev caij tsheb kauj vab. Qhov tseem ceeb yog yuav ua li cas los daws cov teeb meem ntawm cov khoom siv nyob rau hauv cov khoom ntim siab.

Thaum kawg, cia kuv qhia txog cov khoom siv-lub xeev hlau lithium. Nyob rau hauv cov nqe lus ntawm theoretical xam, muaj kev txhim kho nyob rau hauv lithium-ion roj teeb. Kuj tseem muaj peev xwm siv cov roj teeb lithium-ion, xws li cov roj teeb lithium-ion hlau thiab roj teeb cua, uas suav nrog cov roj teeb sib txawv xws li oxygen, dej, thiab carbon dioxide. Hauv cov txiaj ntsig tsuas yog suav, nws tuaj yeem pom tias ntsuab xim hlau lithium siab dua, thaum silicon tsis zoo electrode muaj zog dua. Yog tias 2000mAh silicon siv, Piv nrog rau kev nthuav dav ntawm ntau dua 200, kev nthuav dav ntawm lithium kuj yooj yim dua los daws. Yog tias nws cuam tshuam rau hluav taws xob hluav taws xob ntau dua, lub tswv yim ntawm kev siv lub roj teeb tom qab tseem tuaj yeem siv tau, tab sis tseem muaj qee qhov kev sib tw ntawm kev siv tshuab thiab lwm yam.

Cov roj teeb hlau lithium-ion tau tsim rau ntau tshaj 50 xyoo, tshwj xeeb tshaj yog nyob rau xyoo 1980 thiab 1990s thaum muaj teeb meem loj, thiab tam sim no tsis muaj pov thawj los qhia tias cov roj teeb lithium-ion muaj kev nyab xeeb. Qhov teeb meem ntawm kev siv cov roj teeb hlau lithium-ion rau kev hloov kho yog qhov tsis sib xws ntawm kev tso dej thiab nag lossis daus txawv ntawm graphite thiab silicon. Qhov thib ob, SEI zaj duab xis tsis ruaj khov, yog li ntau tus neeg tseem vam tias yuav siv cov kev daws teeb meem hauv lub xeev los daws qhov teeb meem no. Lub ntsiab lus tseem ceeb ntawm cov cuab yeej siv hluav taws xob hauv lub xeev yog tias nws tuaj yeem daws tau hauv txoj kev xav, yog li muaj ntau yam kev nyab xeeb thiab cov txiaj ntsig, nrog rau cov txiaj ntsig ntawm lub voj voog coefficient. Tsis tas li ntawd, nws tseem tuaj yeem siv rau hauv txoj hlua khi, xws li polymer raws li, thiab ntxiv qee cov kua electrolytes. Ntau lub tuam txhab tau nqis peev ntau hauv nws thoob ntiaj teb, tab sis los ntawm kev pom zoo, cov roj teeb muaj zog siab tsis tau tsim, Qhov teeb meem tseem ceeb ntawm no yog yuav ua li cas los daws qhov tsis zoo ntawm cov electrode.

Los ntawm txoj kev xav ntawm kev tsim kho kev lag luam, qhov sib txawv ntawm cov roj teeb hauv lub xeev yog cov khoom siv hauv lub xeev electrolytes, uas tuaj yeem siv cov roj teeb hlau lithium-ion. Cov roj teeb lithium ion kuj tseem muaj zog heev, uas yog qhov tseeb hauv kev txhim kho kev lag luam. Thaum cov ntaub ntawv tseem ceeb ntawm cov cuab yeej siv roj teeb tuaj yeem tawg, lawv tuaj yeem nkag mus rau hauv kev lag luam sai. Yog li ntawd, peb tau npaj ib co kev qhia, tej zaum qhov ntxov tshaj plaws los tsim cov roj teeb pob yog nyob rau hauv 2019, Nyob rau hauv 2020, nws muaj peev xwm mus ntsuam xyuas qib kev lag luam. Qee cov roj teeb hauv lub xeev tseem qeeb, thiab qhov tseeb tag nrho cov roj teeb hauv lub xeev yuav siv sij hawm ntev dua. Cov roj teeb uas muaj cov kua dej me ntsis yuav nrawm dua vim tias lawv sib npaug ntawm lub zog ceev thiab kev nyab xeeb.

Kaus Lim Qab Teb: 45% nce hauv lub zog lithium roj teeb muaj peev xwm

Raws li cov ntaub ntawv los ntawm online version ntawm phau ntawv xov xwm kev kawm "Natural Energy", pab pawg tshawb fawb los ntawm Ulsan Institute of Science thiab Technology (UNIST) hauv Kaus Lim Qab Teb tsis ntev los no tau tsim cov khoom siv cathode rau cov roj teeb thib ob, uas tuaj yeem ua kom cov roj teeb uas twb muaj lawm los ntawm 45%, ntxiv tsawg kawg yog 100 mais mus rau qhov tam sim no ntau tshaj 200 mais rau tsheb fais fab.

Pab neeg tshawb fawb tau ua tiav cov roj teeb muaj peev xwm los ntawm kev tsim cov khoom siv graphite silicon los hloov cov roj teeb uas twb muaj lawm nrog graphite electrodes. Cov electrode tshiab yog tsim los ntawm kev txhaj tshuaj 20 nanometer (1 billionth ntawm ib lub meter) qhov loj ntawm silicon hais ntawm graphite molecules. Ntxiv nrog rau kev nce ntau, cov thev naus laus zis tshiab ua rau lub sijhawm them thiab tawm lub sijhawm luv luv, thiab lub roj teeb them thiab tshem tawm ceev kuj tseem ntau dua 30% sai dua li cov roj teeb uas twb muaj lawm.

Kev lag luam cia siab tias kev tsim khoom loj ntawm cov roj teeb tshiab no yuav yooj yim dua thiab yuav muaj tus nqi sib tw zoo dua yav tom ntej.

Nyiv: Tsim cov roj teeb lithium-ion uas tsis xav tau cobalt

Raws li cov ntaub ntawv los ntawm Panasonic Electric, Nyiv tau tsim cov khoom siv tshiab rau cov roj teeb lithium-ion uas tsis xav tau cov hlau tsis tshua muaj cobalt, thiab kuj tau tsim ib hom tshiab lithium-ion roj teeb.

Pab pawg tshawb fawb coj los ntawm xibfwb Runichi Yoshida los ntawm Kyoto University of Panasonic Cov Khoom Siv Hluav Taws Xob hauv Nyij Pooj tau tsim cov khoom siv tshiab organic siv lithium thiab carbon, thiab ua tiav ib hom tshiab ntawm lithium-ion roj teeb uas tsis siv cobalt ua cov khoom siv electrode. Cov txiaj ntsig kev sim qhia tau hais tias cov roj teeb uas tsim los nrog cov khoom tshiab muaj peev xwm zoo ib yam li cov roj teeb lithium-ion nrog cobalt uas muaj cov khoom siv electrodes. Hom lithium-ion roj teeb no yuav tsum tawg tawm ntawm kev vam khom ntawm cobalt thiab txo cov nqi tsim khoom.

Lwm qhov zoo dua ntawm kev tsim cov roj teeb lithium-ion nrog cov khoom siv tshiab no yog tias lub roj teeb lub neej ntev dua thiab qhov lwj ntawm qhov qis dua. Cov txiaj ntsig kev sim qhia tau hais tias lub roj teeb lithium-ion uas tsim los ntawm cov khoom tshiab no tau raug them thiab tso tawm 100 zaug, tab sis lub peev xwm degradation ntawm lub roj teeb tsis tshaj 20%. Panasonic Electric npaj los txhim kho cov khoom tshiab no, vam tias yuav nce lub roj teeb them thiab tso tawm zaus mus rau 500 mus rau 1000 zaug, thiab tom qab ntawd pib ua lag luam ntau lawm.