Umthamo yipropathi yokuqala yebhetri,iiseli zebhetri lithiumumthamo ophantsi kwakhona yingxaki rhoqo adibana iisampulu, imveliso yobuninzi, njani ngokukhawuleza ukuhlalutya oonobangela iingxaki umthamo ophantsi badibana, namhlanje ukwazisa kuni zeziphi izizathu umthamo ophantsi iiseli lithium ibhetri?
Ukuhambelana kwezinto, ngokukodwa phakathi kwe-cathode kunye ne-electrolyte, kunempembelelo enkulu kumthamo weseli.Kwi-cathode entsha okanye i-electrolyte entsha, ukuba iimvavanyo eziphindaphindiweyo zityhila umthamo ophantsi we-lithium rhoqo xa iseli ivavanywa, ngoko ke kunokwenzeka ukuba izixhobo ngokwazo azihambelani.Ukungalingani kusenokuba ngenxa yefilimu ye-SEI eyenziwe ngexesha lokubunjwa ingabi xinene ngokwaneleyo, ingqindilili kakhulu okanye ingazinzanga, okanye iPC ekwi-electrolyte eyenza umaleko wegraphite ixobulwe, okanye uyilo lweseli lungakwazi ukuziqhelanisa nentlawulo enkulu/ Amazinga okukhupha ngenxa yoxinaniso olugqithisileyo lomphezulu woxinaniso.
I-diaphragms nayo yinto enempembelelo enokubangela umthamo ophantsi.Siye safumanisa ukuba isandla inxeba diaphragms ukuvelisa imibimbi kulwalathiso longitudinal phakathi umaleko ngamnye, apho lithium ayifakwanga ngokwaneleyo electrode negative yaye ngaloo ndlela kuchaphazela umthamo iseli malunga 3%.Nangona ezinye iimodeli ezimbini zisebenzisa i-semi-automatic winding xa ukushwabana kwe-diaphragm kungaphantsi kakhulu kwaye impembelelo kumthamo yi-1% kuphela, ayisosiseko sokuyeka ukusetyenziswa kwe-diaphragm.
Imida yoyilo lwesakhono esingonelanga nako kunokubangela umthamo ophantsi.Ngenxa yempembelelo ye-electrode efanelekileyo kunye nebi, impazamo ye-capacity divider kunye nefuthe le-adhesive kumthamo, kubalulekile ukuvumela umlinganiselo othile womthamo wamandla xa uyilwa.Xa uyila umda wamandla, kunokwenzeka ukuba ushiye i-surplus emva kokubala umthamo we-core kunye nazo zonke iinkqubo ngokuchanekileyo kumgca ophakathi, okanye ukubala i-surplus emva kokuba zonke izinto ezichaphazela umthamo zenzeke kumda ophantsi.Kwizinto ezintsha, uvavanyo oluchanekileyo lomdlalo wegram yecathode kuloo nkqubo ibalulekile.Isiphindaphindi samandla angaphelelanga, intlawulo yokunqunyulwa kwentlawulo yangoku, ukuphindaphinda kwentlawulo / ukukhupha, uhlobo lwe-electrolyte, njl., zonke zichaphazela ukudlala kwegram ye-cathode.Ukuba ixabiso loyilo lomsebenzi oncomekayo wegram liphezulu ngokuzenzela ukuze kuphunyezwe umthamo ekujoliswe kuwo, oku kukwalingana nomthamo woyilo onganelanga.Akukho nto iphosakeleyo ngojongano lweseli, kwaye akukho nto iphosakeleyo ngedatha yenkqubo iyonke, kodwa umthamo weseli uphantsi.Ngoko ke, izinto ezintsha kufuneka zivavanywe kwigrammage ye-cathode echanekileyo, njengoko ingekho i-cathode efanayo iya kuba negrammage njengayo nayiphi na i-cathode okanye i-electrolyte.
I-electrode engeyiyo eyongezelelweyo inokuchaphazela ukusebenza kwe-electrode efanelekileyo ukuya kumlinganiselo othile, ngaloo ndlela ichaphazela umthamo weseli.Umthwalo ogqithisileyo ongalunganga "ayikho nje ukuba akukho mvula ye-lithium".Ukuba i-overload engalunganga inyuswa ukuya kumda ophantsi we-non-lithium yokugqithiswa kwemvula, kuya kubakho ukunyuka kwe-1% ukuya kwi-2% ekusebenzeni kwegram enhle, kodwa nangona kunyuswa, ukugqithiswa okungalunganga kusanele ukuqinisekisa ukuba umthamo wemveliso uphezulu kangangoko.Xa ukugqithisa kwe-electrode engafanelekanga kuphezulu kakhulu, i-electrode efanelekileyo iya kudlala indima ephantsi kuba i-lithium engenakuguquleka iyadingeka kwikhemistri, kodwa ngokuqinisekileyo oku kunokwenzeka ukuba kwenzeke phantse akukho nanye.
Xa umthamo wenaliti yolwelo usezantsi, umthamo wokugcinwa kolwelo ohambelana nawo uya kuba ngaphantsi.Xa umthamo wokugcinwa kwamanzi weseli uphantsi, ngoko umphumo we-lithium ion embedding kunye ne-de-embedding kwi-electrode efanelekileyo kunye nengalunganga iya kuchaphazeleka, ngaloo ndlela ibangele umthamo ophantsi.Nangona kuya kuba noxinzelelo oluncinci kwiindleko kunye neenkqubo ezinomthamo we-injection ephantsi, isiseko sokunciphisa umthamo we-injection kufuneka ukuba awuchaphazeli ukusebenza kweseli.Ngokuqinisekileyo, ukuthoba inqanaba lokuzalisa kuya kwandisa kuphela amathuba okuba ne-capacitance ephantsi ngenxa yokungonelanga kokugcinwa kolwelo kwiseli, kodwa akusiyo isiphumo esingenakuphepheka.Kwangaxeshanye, kokukhona kunzima ukufunxa ulwelo, kokukhona kufuneka kubekho i-electrolyte engaphezulu kokuqinisekisa ukuba unxibelelwano olungcono ne-electrode ngexesha lokumanzisa i-electrolyte.Ukugcinwa kweeseli okunganeleyo kuya kubangela ukuba i-electrode echanekileyo kunye neyomileyo ibe yomile kwaye ingqimba encinci ye-lithium precipitation phezu kwe-electrode engalunganga, enokuthi ibe yinto ephantsi kwe-capacitance ngenxa yokugcinwa kakubi.
I-electrode ekhatywayo encinci okanye engalunganga inokubangela ngokuthe ngqo isiseko somthamo ophantsi.Xa i-electrode efanelekileyo igqunywe kancinci, i-interface ye-core charged ngokupheleleyo ayiyi kuba yinto engaqhelekanga.I-electrode engalunganga, njengommkeli we-ion ze-lithium, kufuneka ibonelele ngenani elikhulu leendawo ezifakwe kwi-lithium kunenani lemithombo ye-lithium enikezelwa yi-electrode efanelekileyo, ngaphandle koko i-lithium engaphezulu iya kudlula phezu kwe-electrode engalunganga, okukhokelela kuluhlu oluncinci. imvula yelithium efanayo.Njengoko kukhankanyiwe ngaphambili, ngenxa yokuba ubunzima be-electrode engalunganga ayinakuthatyathwa ngokuthe ngqo kubunzima bokubhaka bee-cores, ngoko ke umntu unokwenza olunye uvavanyo lokufumana ubungakanani be-electrode negative weight gain ukuze kuthotywe ubunzima bokugquma ngobunzima bokubhaka be-negative. i-electrode cores.Ukuba i-electrode engalunganga yomthamo ophantsi womthamo unomaleko obhityileyo we-lithium precipitation, amathuba okuba ne-electrode engonelanga iphezulu.Ukongeza, i-cathode okanye i-electrode engalunganga yokwaleka icala le-cathode inokubangela umthamo ophantsi, kwaye i-electrode engalunganga yokwaleka kwicala elinye ilula kakhulu, kuba nokuba i-electrode efanelekileyo yokwambathisa inzima, nangona umdlalo wegram uya kuncitshiswa, kodwa umthamo uwonke uya kuncitshiswa. zingancitshiswa kodwa zinokunyuka.Ukuba i-electrode engalunganga igqunywe kwindawo engafanelekanga, uthelekiso oluthe ngqo lomlinganiselo wobunzima becala elinye neliphindwe kabini emva kokubhaka, okoko nje idatha ifana necala le-A liyi-6% khaphukhaphu kunokwaleka kwicala le-B. ngokusisiseko ukugqiba ingxaki, kunjalo, ukuba ingxaki umthamo ophantsi kakhulu kakhulu, kuyimfuneko ukuqhubela phambili ukubuyisela ingxinano yokwenene umphezulu kwicala A/B.Ukuba ingxaki ye-capacitance ephantsi inzima, kuyimfuneko ukuqhubela phambili ukuxinanisa ubuninzi becala le-A / B.Ukuqengqeleka kutshabalalisa isakhiwo sezinto eziphathekayo, nto leyo echaphazela umthamo.Ulwakhiwo lwemolekyuli okanye lweathom yento esona sizathu sibalulekileyo sokuba ineempawu ezifana nomthamo, amandla ombane, njl.njlUkuba i-electrode e-positive compaction inkulu kakhulu, isiqwenga se-electrode esilungileyo kulula ukuphuka emva kokuvunguza, okuya kubangela umthamo ophantsi.Nangona kunjalo, njengoko i-electrode compaction eyakhayo iya kubangela ukuba isiqwenga se-pole siphuke ngokukhawuleza xa sisongwa, i-electrode epholileyo yokushicilela i-roller ngokwayo ifuna uxinzelelo oluninzi, ngoko ke ukuphindaphinda kokudibana kwe-electrode compaction kuphantsi kakhulu kunokunciphisa i-electrode compaction.Xa i-electrode engalunganga idityanisiwe, i-strip okanye ibhloko ye-lithium precipitation iya kubumba kumphezulu we-electrode engalunganga, kwaye ubuninzi be-liquid egcinwe kwi-core iya kuncitshiswa kakhulu.
Umthamo ophantsi unokubangelwa sisiqulatho samanzi esigqithisileyo.I-Capacitance ephantsi inokwenzeka xa umthamo wamanzi we-electrode ngaphambi kokuzaliswa, indawo yombethe yebhokisi yeglavu ngaphambi kokuzaliswa, umthamo wamanzi we-electrolyte udlula umgangatho, okanye xa umswakama ungeniswa kwisitywina sesibini se-de-aerated.Ukulandelela amanani amanzi afunekayo ekubunjweni kwengundoqo, kodwa xa amanzi edlula ixabiso elithile, amanzi angaphezulu aya konakalisa ifilimu ye-SEI kwaye adle iityuwa ze-lithium kwi-electrolyte, ngaloo ndlela ukunciphisa umthamo we-core.Isiqulatho samanzi sidlula umgangatho weseli epheleleyo yentlawulo yekhosi engalunganga iqhekeza elincinci lomdaka omnyama.
Ixesha lokuposa: Aug-16-2022