लिथियम आयन ब्याट्री सकारात्मक सामग्रीको ताप हानिको कारणहरूको विश्लेषण

Awdur: Iflowpower - Proveedor de centrales eléctricas portátiles

टेस्राले प्रतिनिधित्व गर्ने विद्युतीय सवारी साधनमा NCA, NCM811 वा NCM622 उच्च निकल-आधारित सामग्रीलाई लिथियम आयन ब्याट्री पोजिटिभ सामग्रीको रूपमा प्रयोग गरिन्छ। Txawm li cas los xij, cov khoom siv nickel-nickel zoo li zoo li cov khoom siv hluav taws xob muaj teeb meem kev nyab xeeb, Canadian lub teeb lub zog cia pab pawg Dr. Zhou Wei, Dr.

Wang Jian, Wang Jian, Chemical Imaging Line Station thiab lwm tus xibfwb ntawm Xiamen University of Science thiab Technology, thawj zaug, cov theem faib ntawm cov khoom siv hluav taws xob sib xyaw ua ke kom txog rau thaum cov khoom sib xyaw electrode cua sov tawm ntawm kev tswj, thiab ntau theem sib cais tshwm sim ua ntej thiab tom qab tshav kub poob. Qhov cuam tshuam yog pom los ntawm nano-theem, thiab nws pom tias thermal tawm ntawm kev tswj tau zoo sib xws nrog kev faib tawm ntawm cov neeg siv khoom thiab cov khoom sib khi. Lub roj teeb lithium ion sawv cev los ntawm NCA, NCM811 lossis NCM622 muaj qhov zoo ntawm lub peev xwm siab, tus nqi qis, thiab kev phom sij ib puag ncig.

Tam sim no, lub tsheb fais fab sawv cev los ntawm Tesla yog siv. Txawm li cas los xij, muaj ib qho teeb meem nyob rau hauv lub xub ntiag ntawm kev ruaj ntseg ntawm high nickel txheej zoo electrodes, tshwj xeeb tshaj yog nyob rau hauv high kub qis cov khoom decomposition, tso pa oxygen, ua rau thermal tawm ntawm kev tswj, ua rau lub roj teeb combustion tawg. Los ntawm qhov kev xav ntawm cov kev xav hauv paus, kev nkag siab tob tob ntawm cov theem sib cais ntawm cov khoom hauv lub xeev electrodes nyob rau hauv thermal tawm ntawm kev tswj yog ib qho tseem ceeb rau kev daws teeb meem kev ruaj ntseg ntawm cov khoom siv hauv qab no.

Los ntawm qhov kev xav ntawm kev tsom xam, tus cwj pwm ntawm txoj kev kawm theem yog sib cais nyob rau hauv qhov tseeb ntxeem tau cov electrode, thiab sib raug rau qhov loj ntawm cov khoom siv electrode, kev sib raug zoo ntawm crystal deg tswj, thiab nto passivation zaj duab xis, yog lub hauv paus kev tshawb fawb thiab daim ntawv thov theem. Muab txoj kev zoo tagnrho. Txawm li cas los xij, lub tswv yim no yuav tsum muaj tus cwj pwm zoo heev txhais tau tias yuav tsum tau ua tiav.

Dr. Zhou Wei, Canadian Light Source Storage Group, thiab Dr. Wang Jian nyob rau hauv Chemical Imaging Line chaw nres tsheb ua haujlwm nrog tus lwm thawj xibfwb ntawm txoj kev tus tuav ntaub ntawv ntawm Xiamen University of Technology los tsim kho cov kev sib txuas lus X-ray scanning ntawm cov ntsiab lus thiab orbit selectivity, tshuaj thiab hluav taws xob cov qauv.

MicroT (PEEM) yog siv los kawm txog tus cwj pwm ntawm theem kev sib cais ntawm thermostatic acid lithium lithium laminate hais nyob rau hauv cov ntxeem tau electrode. Txoj haujlwm no tau tshaj tawm raws li kev tshawb fawb tseem ceeb hauv daim ntawv ntawm Kev Sib Txuas Lus Chemical. Los ntawm cov tub ntxhais kawm nyob rau hauv situ, cov kws sau ntawv siv cov theem faib ntawm complex composite electrode tshav kub kom txog rau thaum lub complex composite electrode thermal tawm ntawm kev tswj, thiab cov correlation ntawm ntau theem sib cais phenomena nyob rau hauv lub correlation ua ntej thiab tom qab thermal out-of-tswj yog pom.

Kev pom kev. Lub tshav kub poob ua ntej thiab tom qab theem sib cais nyob rau hauv ib tug tib electrode particle theem exhibits unpredictable unevenness. Qhov no tsis yog-uniformization thiab particle loj, siv lead ua deg qauv tsis pom tseeb, tab sis kev faib cov khoom siv hluav taws xob thiab cov binders zoo sib xws.

Qhov no yog thawj zaug kom ua tiav nano pom kev sib cais los ntawm tib cov khoom ua ntej thiab tom qab lub tshav kub poob, thiab koom nrog nws qhov chaw electrode. Qhov no txhais tau hais tias ntawm kev ua kom tob zuj zus ntawm thermal hloov pauv tus cwj pwm ntawm cov khoom laminated yog qhov tseem ceeb, tsim nyog rau kev txhawb nqa cov txheej txheem reactive, attenuation mechanism ntawm lwm cov tshuab electrode los kawm cov thermal tawm ntawm kev tswj. Tsab xov xwm ua ntej siv lub ntsiab lus ntawm cov ntsiab lus ntawm PEEM nrog rau cov khoom siv hluav taws xob, suav nrog lithium cobaltate, PVDF, thiab kev faib hluav taws xob hluav taws xob carbon dub.

Ua ntej lub tshav kub poob, tus neeg sawv cev conductive thiab cov binder yog sib xyaw uniformly coexist, tab sis qhov no agglomeration yog uneven nyob rau hauv lub nto ntawm lithium cobaltate hais thiab hais. Lub thermal poob ntawm PVDF yog qhov pom tseeb, thaum cov pa roj carbon dub tseem sib xyaw ua ke hauv lithium cobalt acid nyob rau hauv daim ntawv ntawm agglomeration. PEEM tuaj yeem ncav cuag qhov kev daws teeb meem ntawm 100 nm, thiab tuaj yeem ua duab rau ntawm 50 um electrode nto.

High spatial daws teeb meem thiab high-imaging lub sij hawm ua tau siab daws teeb meem imaging ntawm multi-particles. Lub morphology ntawm lithium cobaltate hais tuaj yeem siv los kawm txog kev hloov pauv thermal ntawm tib lub electrode hais ua ntej thiab tom qab ntsuas kub. Qhov kev tshawb pom tshiab tshaj plaws ntawm cov khoom siv hluav taws xob, kev faib tawm ntawm cov ntaub ntawv yuav ua rau cov roj teeb lithium-ion zoo cov khoom siv thermal tawm-ntawm-tswj daim duab 1.

Cov txheej txheem kev faib tawm thiab kev sib raug zoo thiab kev sib raug zoo ntawm daim duab ntsuas kub tom qab ntsuas kub (A, B) (C, D) raug muab cais rau hauv txhua qhov Kev nqus spectrum ntawm cobalt caij ntawm pixel chav tsev cobalt siv ib theem, suav nrog cov spectral decomposition haum ntawm CO2 + (thermal tawm-tswj tso pa oxygen tsim), CO3 + (LCO) tag nrho cov nqi CO3 + (LCO) Kev tsis sib xws ntawm theem sib cais yog qhov zoo nyob hauv daim duab C thiab D.

Yog tias daim ntawv qhia kev sib cais theem tau txais nrog cov txiaj ntsig ntawm qhov profile, qhov kev sib cais ntawm theem no muaj kev sib raug zoo nrog kev faib tawm ntawm cov pa roj carbon dub ua ntej thiab tom qab thermal poob. Lub ntsuas sov tau txo qis qhov loj ntawm theem sib cais. Nws txawv ntawm qhov kev txiav txim siab tau txais los ntawm kev them nyiaj tshuaj lom neeg tom qab kev them nyiaj tshuaj lom neeg los ntawm kev siv tshuaj lom neeg yav dhau los.

Qhov cuam tshuam ntawm electrode hais, qhov loj me, thiab siv lead ua qhov taw qhia qhov chaw nyob deb tsawg dua qhov chaw ib puag ncig, tshwj xeeb tshaj yog cov nyhuv ntawm cov khoom siv hluav taws xob.