Nyob zoo, phooj ywg! Koj puas paub tias lub zog tseem ceeb yog dab tsi hauv cov khoom siv hluav taws xob uas peb tsis tuaj yeem nyob tsis muaj txhua hnub, xws li xov tooj ntawm tes thiab laptops? Yog lawm, nws yog lithium roj teeb. Tab sis koj puas to taub qee qhov teeb meem tshwm sim hauv cov roj teeb lithium - lithium plating? Niaj hnub no, cia peb tshawb xyuas qhov tshwm sim ntawm lithium plating tshwm sim hauv cov roj teeb lithium, nkag siab tias nws yog dab tsi, nws cuam tshuam dab tsi, thiab peb tuaj yeem daws nws li cas.
I. Dab tsi yog lithium plating hauv lithium roj teeb?
Lithium plating hauv lithium roj teeb zoo li "me ntsis kev huam yuaj" hauv lub ntiaj teb roj teeb. Tsuas yog muab tso rau hauv ib qho xwm txheej tshwj xeeb, lithium ions hauv lub roj teeb yuav tsum nyob twj ywm zoo ntawm qhov tsis zoo electrode, tab sis hloov, lawv ua phem rau ntawm qhov tsis zoo ntawm electrode thiab tig mus rau hauv cov hlau lithium, ib yam li cov ceg ntoo me me. Peb hu qhov no lithium dendrite. Qhov tshwm sim no feem ntau tshwm sim nyob rau hauv qhov chaw uas muaj qhov kub thiab txias los yog thaum lub roj teeb rov ua dua thiab tso tawm. Vim tias lub sijhawm no, cov lithium ions khiav tawm ntawm qhov zoo electrode tsis tuaj yeem muab tso rau hauv qhov tsis zoo electrode thiab tuaj yeem tsuas yog "tshem tawm" rau ntawm qhov chaw ntawm qhov tsis zoo electrode.
II. Vim li cas lithium plating tshwm sim?
Qhov tshwm sim lithium plating tshwm sim tsis tshwm sim vim tsis muaj laj thawj. Nws tshwm sim los ntawm ntau yam ua haujlwm ua ke.
Ua ntej, yog tias "lub tsev me" ntawm qhov tsis zoo electrode tsis loj txaus, uas yog, lub peev xwm tsis zoo electrode tsis txaus kom haum rau tag nrho cov lithium ions khiav los ntawm qhov zoo electrode, ces cov lithium ions ntau dhau tuaj yeem tsuas yog los nag rau ntawm qhov chaw. qhov tsis zoo electrode.
Qhov thib ob, ceev faj thaum them nyiaj! Yog tias them nyiaj ntawm qhov kub qis, nrog rau qhov tam sim no loj, lossis overcharge, nws zoo li muaj ntau tus qhua tuaj rau "tsev me" ntawm qhov tsis zoo electrode tag nrho ib zaug. Nws tsis tuaj yeem tuav nws, thiab cov lithium ions tsis tuaj yeem muab tso rau hauv lub sijhawm, yog li qhov tshwm sim lithium plating tshwm sim.
Tsis tas li ntawd, yog tias cov qauv sab hauv ntawm lub roj teeb tsis tsim tsim nyog, xws li yog tias muaj wrinkles nyob rau hauv lub separator los yog lub roj teeb cell deformed, nws yuav cuam tshuam rau txoj kev hauv tsev rau lithium ions thiab ua rau lawv nrhiav tsis tau txoj kev, uas. tuaj yeem yooj yim ua rau lithium plating.
Tsis tas li ntawd, cov electrolyte zoo li "cov lus qhia me me" rau lithium ions. Yog hais tias tus nqi ntawm cov electrolyte tsis txaus los yog cov electrode daim hlau tsis tag nrho infiltrated, lithium ions yuav ploj, thiab lithium plating yuav ua raws.
Thaum kawg, SEI zaj duab xis nyob rau saum npoo ntawm qhov tsis zoo electrode kuj tseem ceeb heev! Yog tias nws dhau los ua tuab lossis puas lawm, lithium ions tsis tuaj yeem nkag mus rau qhov tsis zoo electrode, thiab lithium plating tshwm sim yuav tshwm sim.
III. Peb tuaj yeem daws lithium plating li cas?
Tsis txhob txhawj, peb muaj txoj hauv kev los daws cov lithium plating.
Peb tuaj yeem txhim kho cov qauv roj teeb. Piv txwv li, tsim lub roj teeb kom tsim nyog, txo qhov chaw hu ua Overhang, siv ntau lub tab tsim, thiab kho qhov N / P piv kom tso cai rau lithium ions ntws zoo dua.
Tswj lub roj teeb them thiab tshem tawm cov xwm txheej kuj tseem ceeb heev. Nws zoo li kev npaj tsim nyog "kev cai tsheb" rau lithium ions. Tswj cov kev them nqi thiab tawm qhov hluav taws xob, tam sim no, thiab qhov kub thiab txias kom cov lithium plating cov tshuaj tiv thaiv tsis tshua muaj tshwm sim.
Kev txhim kho cov muaj pes tsawg leeg ntawm cov electrolyte kuj zoo. Peb tuaj yeem ntxiv lithium ntsev, tshuaj ntxiv, lossis cov kuab tshuaj sib xyaw ua kom cov electrolyte zoo dua. Nws tuaj yeem tsis tsuas yog inhibit qhov decomposition ntawm electrolyte tab sis kuj tiv thaiv cov tshuaj tiv thaiv lithium plating.
Peb kuj tuaj yeem hloov kho cov khoom tsis zoo electrode. Nws zoo li muab "cov khaub ncaws tiv thaiv" rau ntawm qhov tsis zoo electrode. Los ntawm txoj kev xws li txheej txheej, doping, lossis alloying, peb tuaj yeem txhim kho qhov ruaj khov thiab tiv thaiv lithium plating muaj peev xwm ntawm qhov tsis zoo electrode.
Ntawm chav kawm, lub roj teeb tswj system kuj tseem ceeb heev. Nws yog zoo li tus ntse "butler" uas saib xyuas thiab ntse tswj cov txheej txheem them nqi thiab tawm hauv lub sijhawm tiag tiag kom ntseeg tau tias lub roj teeb ua haujlwm nyob rau hauv kev nyab xeeb, tsis txhob overcharging thiab tawm, thiab txo qhov kev pheej hmoo ntawm lithium plating.
IV. Dab tsi cuam tshuam lithium plating muaj rau cov roj teeb?
Lithium plating tsis yog qhov zoo! Nws yuav ua rau lithium dendrites loj hlob hauv lub roj teeb. Cov lithium dendrites no zoo li cov teeb meem me me. Lawv tuaj yeem nkag mus rau qhov sib cais thiab ua rau muaj kev cuam tshuam sab hauv, uas yog qhov txaus ntshai heev. Tej zaum nws yuav txawm ua rau thermal runaway thiab kev nyab xeeb xwm txheej. Ntxiv mus, thaum lub sij hawm lithium plating txheej txheem, tus naj npawb ntawm lithium ions txo, thiab lub peev xwm ntawm lub roj teeb kuj yuav poob, ua rau lub roj teeb lub neej ua haujlwm luv.
V. Dab tsi yog kev sib raug zoo ntawm qhov kub thiab txias ib puag ncig thiab lithium plating?
Nyob rau hauv ib puag ncig uas tsis kub, cov electrolyte yuav nplaum. Lithium nag lossis daus ntawm qhov tsis zoo electrode yuav hnyav dua, tus nqi hloov pauv impedance yuav nce ntxiv, thiab cov xwm txheej kinetic kuj yuav deteriorate. Cov xwm txheej no ua ke zoo li kev ntxiv roj rau qhov tshwm sim lithium plating, ua rau cov roj teeb lithium ntau dua rau lithium plating nyob rau hauv qhov kub thiab txias ib puag ncig thiab cuam tshuam rau kev ua haujlwm tam sim thiab kev noj qab haus huv ntawm lub roj teeb.
VI. Yuav ua li cas lub roj teeb tswj system txo lithium plating?
Lub roj teeb tswj system muaj zog heev! Nws tuaj yeem saib xyuas cov roj teeb tsis nyob hauv lub sijhawm, ib yam li ob lub qhov muag ntse, ib txwm saib lub roj teeb qhov xwm txheej. Tom qab ntawd kho lub tswv yim them nyiaj raws li cov ntaub ntawv los ua kom cov lithium ions mloog lus.
Nws tseem tuaj yeem txheeb xyuas qhov txawv txav ntawm lub roj teeb them nkhaus. Zoo li tus kws tshawb nrhiav ntse, nws tuaj yeem kwv yees lithium plating tshwm sim ua ntej thiab zam nws.
Kev tswj cua sov kuj tseem ceeb heev! Lub roj teeb tswj system tuaj yeem ua kom sov lossis txias lub roj teeb kom tswj tau qhov kub thiab txias thiab tso cai rau lithium ions txav ntawm qhov ntsuas kub kom txo tau qhov kev pheej hmoo ntawm lithium plating.
Kev them nyiaj sib npaug kuj tseem ceeb. Nws tuaj yeem ua kom ntseeg tau tias txhua lub roj teeb hauv lub pob roj teeb tau them tus nqi sib npaug, ib yam li tso cai rau txhua lub lithium ion nrhiav nws tus kheej "chav me".
Ntxiv mus, los ntawm kev nce qib hauv cov ntaub ntawv tshawb fawb, peb tuaj yeem ua kom zoo dua cov khoom siv hluav taws xob tsis zoo thiab cov qauv tsim ntawm lub roj teeb kom lub roj teeb muaj zog.
Thaum kawg, kho tus nqi them thiab kev faib tam sim no kuj tseem ceeb heev. Zam kev ua kom ntev dua qub thiab teeb tsa txoj kev txiav txim siab tsim nyog txiav tawm kom muaj kev nyab xeeb ntxig rau hauv qhov tsis zoo electrode.
Hauv kev xaus, txawm hais tias qhov tshwm sim ntawm lithium plating tshwm sim hauv cov roj teeb lithium yog qhov teeb meem me ntsis, tsuav yog peb nkag siab tob txog nws cov laj thawj thiab siv cov kev tiv thaiv thiab kev tswj xyuas zoo, peb tuaj yeem ua kom cov roj teeb lithium muaj kev nyab xeeb, muaj kev ua tau zoo dua, thiab muaj kev pabcuam ntev dua. Cia peb ua haujlwm ua ke los tiv thaiv peb cov roj teeb lithium!
