Kev txhim kho qhov pib coulombic efficiency ntawm lithium-ion roj teeb yog ib qho nyuaj thiab tseem ceeb, uas yog ncaj qha ntsig txog kev siv lub zog thiab kev ua tau zoo ntawm lub roj teeb. Cov hauv qab no yog ib qho kev ntsuam xyuas qhov tob ntawm qhov cuam tshuam rau thawj coulombic efficiency ntawm lithium-ion roj teeb los ntawm ntau qhov kev xav, thiab tawm tswv yim cov kev daws teeb meem.
1.Qhov cuam tshuam rau thawj coulombic efficiency ntawm lithium-ion roj teeb
(1) Anode khoom yam ntxwv
①Specific deg cheeb tsam: Qhov loj dua qhov chaw tshwj xeeb ntawm cov graphite anode electrode, ntau lithium ions yuav tsum tau tsim cov khoom electrolyte interface zaj duab xis (SEI zaj duab xis), yog li txo cov thawj coulombic efficiency.
②Material hom: Txawm hais tias silicon-raws li anode electrode cov ntaub ntawv muaj peev xwm lithium siab, lawv cov ntim loj hloov tau yooj yim ua rau SEI zaj duab xis tsis ruaj khov, ntxiv txo cov thawj coulombic efficiency.
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(2) Electrolyte muaj pes tsawg leeg
①Solvent type: Hom kuab tshuaj nyob rau hauv cov electrolyte muaj kev cuam tshuam tseem ceeb ntawm kev tsim thiab ruaj khov ntawm SEI zaj duab xis. Piv txwv li, ib qho electrolyte nrog cov ntsiab lus siab ntawm ethylene carbonate (EC) yog qhov tsim nyog rau kev tsim cov yeeb yaj kiab SEI ruaj khov, tab sis cov ntsiab lus siab dhau los yog qis dhau yuav ua rau txo qis hauv thawj coulombic efficiency.
②Additives: Film-forming additives nyob rau hauv cov electrolyte, xws li vinylene carbonate (VC), tuaj yeem txhawb kev tsim ntawm SEI zaj duab xis thiab txhim kho nws ruaj khov, yog li txhim kho thawj coulombic efficiency.
(3) Tsim
①Charging voltage thiab tam sim no: Qhov voltage thiab tam sim no nqis thaum lub sij hawm tsim them ncaj qha cuam tshuam rau kev tsim zoo thiab thickness ntawm SEI zaj duab xis. Kev siv hluav taws xob ntau dhau thiab tam sim no tuaj yeem ua rau SEI zaj duab xis tuab heev thiab tsis sib xws, yog li ua rau kev noj cov lithium ions thiab txo cov thawj coulombic efficiency.
②Formation peev: Lub peev xwm tsim nqi yog qhov tseem ceeb cuam tshuam rau SEI zaj duab xis tsim nyhuv. Qhov tsim nyog tsim muaj peev xwm tuaj yeem ua kom muaj qhov zoo ntawm SEI zaj duab xis thaum tsis txhob siv lithium ion ntau dhau.
(4) Cov txheej txheem tsim khoom roj teeb
①Coating thiab calendering: Txheej thickness thiab compaction ceev ntawm cathode thiab anode muaj ib qho tseem ceeb ntawm kev thauj cov lithium ions thiab tsim ntawm SEI zaj duab xis. Cov txheej tsis sib xws thiab kev sib txuam ntau dhau tuaj yeem ua rau txo qis hauv thawj coulombic efficiency.
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②Winding thiab sib dhos: Cov yam ntxwv xws li kev tswj nruj thiab kev sib haum xeeb thaum lub caij winding, kev huv huv thaum sib dhos tuaj yeem cuam tshuam rau cov qauv sab hauv thiab kev ua haujlwm ntawm lub roj teeb, yog li cuam tshuam rau thawj coulombic efficiency.
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2. Txoj hauv kev los txhim kho thawj coulombic efficiency ntawm lithium-ion roj teeb
(1) Ua kom zoo dua cov khoom siv anode
① Txo qhov tshwj xeeb ntawm thaj chaw: Los ntawm kev ua kom zoo dua qhov particle morphology thiab particle loj faib ntawm cov khoom siv electrode, nws qhov chaw tshwj xeeb tuaj yeem raug txo, yog li txo cov lithium ions xav tau rau SEI zaj duab xis tsim.
② Ntxiv stabilizers: Qhia cov stabilizers xws li carbon txheej rau hauv cov khoom siv electrode los txhim kho nws cov qauv kev ruaj ntseg thiab kev ruaj ntseg ntawm SEI zaj duab xis.
(2) Kho cov txheej txheem electrolyte
① Optimize hnyav piv: Kho qhov sib piv ntawm txhua qhov hnyav hauv cov electrolyte raws li cov yam ntxwv ntawm cov khoom siv electrode los ua ib qho ruaj khov thiab ntom ntom SEI zaj duab xis.
② Ntxiv cov yeeb yaj kiab-forming additives: Ntxiv qhov tsim nyog ntawm cov yeeb yaj kiab-forming additives xws li VC rau cov electrolyte los txhawb kev tsim ntawm SEI zaj duab xis thiab txhim kho nws ruaj khov.
(3) Optimize qhov tsim
①Txoj kev tswj qhov hluav taws xob thiab tam sim no: Precisely tswj qhov voltage thiab tam sim no teeb tsa thaum tsim them raws li tus yam ntxwv ntawm cov khoom siv electrode thiab roj teeb tsim.
②Optimize tsim muaj peev xwm: Txiav txim siab qhov zoo tshaj plaws tsim nqi peev ntau los ntawm kev sim los xyuas kom meej qhov zoo ntawm SEI zaj duab xis tsim thiab zam dhau lithium ion noj.
(4) Txhim kho cov txheej txheem tsim roj teeb
① Txhim kho txheej txheej thiab compaction raug: Siv cov txheej txheem txheej thiab cov khoom siv calendering thiab thev naus laus zis los txhim kho qhov sib xws ntawm txheej tuab thiab compaction ntom ntawm qhov zoo thiab anode electrodes.
② Ua kom muaj kev huv huv thiab kev tswj xyuas kom zoo: Txhim kho kev huv huv thiab kev tshuaj xyuas zoo thaum lub sijhawm tsim cov roj teeb kom ntseeg tau tias lub roj teeb ntawm cov qauv sab hauv thiab kev ua haujlwm ruaj khov.
(5) Siv cov tshuab ua ntej lithiation
Anode electrode pre-lithiation: Ib txheej lithium yog pre-deposited ntawm lub anode electrode nto los ntawm pre-lithiation technology los them rau cov lithium ions noj thaum SEI zaj duab xis yog tsim, yog li txhim kho thawj coulombic efficiency. Cov txheej txheem ua ntej lithium feem ntau suav nrog kev tsim ntxov ntawm anode electrode thiab txau lithium hmoov rau ntawm anode electrode.
3. Cov lus xaus
Kev txhim kho thawj coulombic efficiency ntawm lithium-ion roj teeb yuav tsum muaj ntau txoj hauv kev. Ua tib zoo xav txog yam xws li cov khoom siv anode, cov khoom siv electrolyte, tsim thiab them nyiaj, thiab cov txheej txheem tsim roj teeb. Los ntawm kev ua kom zoo dua cov yam ntxwv no thiab siv cov thev naus laus zis ua ntej lithium, thawj coulombic efficiency ntawm lithium-ion roj teeb tuaj yeem txhim kho tau zoo thiab lawv cov kev ua tau zoo tag nrho tuaj yeem txhim kho. Nws yuav tsum raug sau tseg tias cov tswv yim los txhim kho thawj coulombic efficiency yuav txawv raws li cov khoom sib txawv thiab cov txheej txheem, yog li kev sim thiab kev ua kom zoo yuav tsum tau ua raws li cov xwm txheej tshwj xeeb.
