Peev xwm yog thawj cov cuab yeej ntawm lub roj teeb,lithium roj teeb cellmuaj peev xwm tsawg kuj yog ib qho teeb meem nquag ntsib hauv cov qauv, ntau lawm, yuav ua li cas tam sim ntawd txheeb xyuas qhov ua rau muaj teeb meem tsis muaj peev xwm ntsib, hnub no los qhia koj txog dab tsi yog vim li cas lub peev xwm ntawm cov roj teeb lithium?
Kev sib txuam ntawm cov ntaub ntawv, tshwj xeeb tshaj yog nyob nruab nrab ntawm cov cathode thiab cov electrolyte, muaj kev cuam tshuam loj rau lub peev xwm ntawm tes.Rau cov cathode tshiab los yog cov electrolyte tshiab, yog tias qhov kev sim rov ua dua qhia cov lithium nag lossis daus uas tsis muaj peev xwm txhua zaus cov cell raug kuaj, ces nws muaj feem ntau tias cov ntaub ntawv lawv tus kheej tsis sib xws.Qhov tsis sib haum xeeb tuaj yeem yog vim SEI zaj duab xis tsim thaum lub sijhawm tsim tsis tuab txaus, tuab heev lossis tsis ruaj khov, lossis lub PC hauv cov electrolyte ua rau cov graphite txheej tev tawm, lossis cov qauv tsim ntawm tes tsis tuaj yeem hloov mus rau cov nqi loj / tso tawm tus nqi vim yog overdensity compaction.
Diaphragms kuj yog ib qho kev cuam tshuam uas tuaj yeem ua rau muaj peev xwm tsawg.Peb tau pom tias txhais tes qhov txhab diaphragms tsim wrinkles nyob rau hauv lub longitudinal kev taw qhia nyob rau hauv nruab nrab ntawm txhua txheej, qhov twg cov lithium tsis txaus embedded nyob rau hauv lub tsis zoo electrode thiab yog li cuam tshuam lub peev xwm ntawm tes los ntawm ib ncig ntawm 3%.Txawm hais tias lwm tus qauv siv ib nrab tsis siv neeg winding thaum lub diaphragm wrinkling tsawg dua thiab qhov cuam tshuam ntawm lub peev xwm tsuas yog 1%, nws tsis yog lub hauv paus rau kev txiav kev siv cov diaphragm.
Kev tsim peev txheej tsis txaus tuaj yeem ua rau muaj peev xwm tsawg.Vim tias qhov cuam tshuam ntawm qhov zoo thiab qhov tsis zoo electrode txheej, qhov yuam kev ntawm lub peev xwm faib thiab qhov cuam tshuam ntawm cov nplaum ntawm lub peev xwm, nws yog ib qho tseem ceeb uas yuav tsum tau tso cai rau qee qhov peev txheej thaum tsim.Thaum tsim cov peev txheej, nws muaj peev xwm tawm ntawm qhov seem tom qab xam lub peev xwm ntawm cov tub ntxhais nrog txhua cov txheej txheem raws nraim hauv nruab nrab kab, los yog xam cov nyiaj seem tom qab txhua yam cuam tshuam rau lub peev xwm tau tshwm sim ntawm qhov qis dua.Rau cov ntaub ntawv tshiab, kev ntsuam xyuas raug ntawm cov gram ua si ntawm cathode hauv qhov system yog qhov tseem ceeb.Ib feem muaj peev xwm multiplier, tus nqi txiav tawm tam sim no, tus nqi / tso tawm ntau, hom electrolyte, thiab lwm yam, txhua yam cuam tshuam rau cathode gram ua si.Yog hais tias tus tsim tus nqi ntawm qhov zoo gram kev ua tau zoo yog artificially siab nyob rau hauv thiaj li yuav ua tau lub hom phiaj muaj peev xwm, qhov no kuj sib npaug rau ib tug tsis txaus tsim peev xwm.Tsis muaj dab tsi tsis ncaj ncees lawm nrog lub interface ntawm lub xov tooj ntawm tes, thiab tsis muaj dab tsi tsis ncaj ncees lawm nrog cov ntaub ntawv txheej txheem tag nrho, tab sis lub peev xwm ntawm lub xov tooj ntawm tes yog tsawg.Yog li ntawd, cov ntaub ntawv tshiab yuav tsum raug soj ntsuam rau qhov tseeb cathode grammage, vim tsis yog tib lub cathode yuav muaj tib grammage li cov cathode lossis electrolyte.
Tshaj tsis zoo electrode tuaj yeem cuam tshuam kev ua haujlwm ntawm qhov zoo electrode rau qee qhov, yog li cuam tshuam rau lub peev xwm ntawm tes.Tsis zoo overload tsis yog "tsuas yog tsis muaj lithium nag lossis daus".Yog hais tias qhov tsis zoo overload yog nce mus rau qis qis ntawm cov tsis-lithium nag lossis daus overload, yuav muaj 1% mus rau 2% nce hauv qhov zoo gram kev ua tau zoo, tab sis txawm tias nws nce ntxiv, qhov tsis zoo overload tseem txaus los xyuas kom meej tias. lub peev xwm tso zis ntau li ntau tau.Thaum qhov tsis zoo electrode ntau dhau lawm, qhov zoo electrode yuav ua lub luag haujlwm qis dua vim tias ntau dua lithium xav tau rau chemistry, tab sis tau kawg qhov tshwm sim ntawm qhov tshwm sim yuav luag tsis muaj.
Thaum cov kua ntim ntim qis dua, cov kua ntim ntim cov kua dej kuj yuav qis dua.Thaum cov kua tuav ntim ntawm lub xovtooj yog tsawg, ces cov nyhuv ntawm lithium ion embedding thiab de-embedding nyob rau hauv qhov zoo thiab tsis zoo electrodes yuav raug cuam tshuam, yog li ua rau muaj peev xwm tsawg.Txawm hais tias yuav muaj tsawg dua ntawm cov nqi thiab cov txheej txheem nrog lub ntim ntim qis dua, lub hauv paus ntawm kev txo qis qhov ntim yuav tsum yog tias nws tsis cuam tshuam rau kev ua haujlwm ntawm tes.Tau kawg, txo qis cov qib sau yuav tsuas yog nce qhov tshwm sim ntawm qhov tsis tshua muaj peev xwm vim muaj cov kua dej tsis txaus hauv lub xov tooj ntawm tes, tab sis tsis yog qhov tshwm sim uas yuav tshwm sim.Nyob rau tib lub sijhawm, qhov nyuaj dua nws yog nqus cov kua, qhov ntau dua electrolyte yuav tsum tau ua kom muaj kev sib cuag zoo nrog cov electrode thaum lub sij hawm ntub dej electrolyte.Kev tuav pov hwm ntawm tes tsis txaus yuav ua rau qhov zoo thiab qhov tsis zoo ntawm cov electrodes qhuav thiab nyias txheej ntawm lithium nag lossis daus nyob rau sab saum toj ntawm qhov tsis zoo electrode, uas tuaj yeem ua rau muaj qhov tsis zoo vim qhov tsis zoo.
Ib qho yooj yim coated zoo los yog tsis zoo electrode tuaj yeem ua rau lub peev xwm tsis tshua muaj zog.Thaum qhov zoo electrode yog maj mam coated, lub interface ntawm cov ntsiab lus them tag nrho yuav tsis txawv txav.Qhov tsis zoo electrode, raws li tus neeg tau txais kev pab ntawm lithium ions, yuav tsum muab ntau dua ntawm cov lithium embedded txoj hauj lwm tshaj li cov lithium qhov chaw muab los ntawm qhov zoo electrode, txwv tsis pub tshaj lithium yuav precipitate rau saum npoo ntawm qhov tsis zoo electrode, uas ua rau nyias txheej. ntawm ntau uniform lithium nag lossis daus.Raws li tau hais ua ntej, vim tias qhov tsis zoo electrode qhov hnyav tsis tuaj yeem coj ncaj qha los ntawm qhov hnyav ntawm cov cores, yog li ib tus tuaj yeem ua lwm yam kev sim kom pom qhov sib piv ntawm qhov tsis zoo electrode qhov hnyav nce txhawm rau txiav cov txheej hnyav los ntawm qhov hnyav ntawm qhov tsis zoo. electrode cores.Yog tias qhov tsis zoo electrode ntawm cov tub ntxhais muaj peev xwm tsawg muaj ib txheej nyias ntawm lithium nag lossis daus, qhov ua tau ntawm cov electrode tsis txaus yog siab.Tsis tas li ntawd, cov cathode los yog tsis zoo electrode txheej cathode sab kuj tuaj yeem ua rau muaj peev xwm tsawg, thiab qhov tsis zoo electrode ib sab txheej yog lub teeb, vim tias txawm tias qhov zoo electrode txheej hnyav, txawm hais tias qhov kev ua si gram yuav raug txo, tab sis tag nrho lub peev xwm yuav tsis raug txo tab sis tseem yuav nce ntxiv.Yog hais tias qhov tsis zoo electrode coated nyob rau hauv qhov chaw tsis ncaj ncees lawm, kev sib piv ncaj qha ntawm tus txheeb ze qhov hnyav piv ntawm ib leeg thiab ob sab tom qab ci, tsuav yog cov ntaub ntawv zoo ib yam li A sab yog 6% sib zog dua B sab txheej, tuaj yeem Hauv paus txiav txim siab qhov teeb meem, ntawm chav kawm, yog tias qhov teeb meem ntawm lub peev xwm tsawg heev, nws yog ib qho tsim nyog yuav tsum rov thim rov qab qhov tseeb qhov ntom ntom ntawm A / B sab.Yog tias qhov teeb meem ntawm qhov tsis tshua muaj peev xwm loj heev, nws yog qhov yuav tsum tau ua kom pom qhov tseeb qhov ceev ntawm A / B sab.Rolling rhuav tshem cov qauv ntawm cov khoom, uas nyob rau hauv lem cuam tshuam lub peev xwm.Lub molecular lossis atomic qauv ntawm cov khoom siv yog qhov laj thawj vim li cas nws muaj cov khoom muaj peev xwm, qhov hluav taws xob, thiab lwm yam. Thaum qhov ceev ntawm qhov zoo electrode rolls tshaj tus nqi txheej txheem, qhov zoo electrode yuav ci heev thaum lub hauv paus yog dismantled.Yog tias qhov zoo electrode compaction loj dhau lawm, qhov zoo electrode daim yog yooj yim tawg tom qab winding, uas yuav ua rau muaj peev xwm tsawg.Txawm li cas los xij, raws li qhov zoo electrode compaction yuav ua rau cov ncej tawg sai li sai tau thaum nws yog folded, qhov zoo electrode cov menyuam xovxwm nws tus kheej yuav tsum muaj ntau lub siab, yog li qhov zaus ntawm kev sib ntsib zoo electrode compaction yog qis dua qhov tsis zoo electrode compaction.Thaum cov electrode tsis zoo yog compacted, ib tug sawb los yog thaiv ntawm lithium nag lossis daus yuav tsim nyob rau ntawm qhov chaw ntawm qhov tsis zoo electrode, thiab cov kua uas khaws cia rau hauv cov tub ntxhais yuav raug txo kom tsawg.
Tsis muaj peev xwm kuj tuaj yeem tshwm sim los ntawm cov dej ntau dhau.Tsawg capacitance yog ua tau thaum cov dej cov ntsiab lus ntawm electrode ua ntej sau, lub lwg taw tes ntawm lub hnab looj tes ua ntej sau, cov dej cov ntsiab lus ntawm cov electrolyte tshaj tus qauv, los yog thaum ya raws yog nkag mus rau hauv lub de-aerated thib ob foob.Cov dej ntau npaum li cas yuav tsum tau ua rau kev tsim cov tub ntxhais, tab sis thaum cov dej ntau tshaj ib qho nqi, cov dej ntau dhau yuav ua rau cov yeeb yaj kiab SEI puas thiab haus cov lithium ntsev hauv cov electrolyte, yog li txo lub peev xwm ntawm cov tub ntxhais.Cov ntsiab lus dej tshaj tus qauv ntawm lub xov tooj ntawm tes tag nrho cov nqi tsis zoo ib qho me me ntawm cov xim av tsaus.
Post lub sij hawm: Aug-16-2022