Ukusebenza kwebhetri ye-lithium ephantsi-imeko ephantsi

Ilizwe eliqinileyoiibhetri ze-lithium ezinobushushu obuphantsibonisa ukusebenza kwe-electrochemical ephantsi kumaqondo obushushu aphantsi.Ukutshaja kwebhetri ye-lithium-ion kubushushu obuphantsi kuya kuvelisa ubushushu kwimpendulo yekhemikhali yee-electrode ezilungileyo nezingalunganga, okukhokelela kubushushu obugqithisileyo be-electrode.Ngenxa yokungazinzi kwee-electrodes ezintle kunye nezibi kumaqondo aphantsi, kulula ukubangela ukuba i-electrolyte reaction ivelise ama-bubbles emoyeni kunye ne-lithium precipitation, ngaloo ndlela itshabalalise ukusebenza kwe-electrochemical.Ngoko ke, ukushisa okuphantsi kuyinkqubo engenakuphepheka kwinkqubo yokuguga yebhetri.

Ubushushu bokukhutshwa buphantsi kakhulu

Iqondo lobushushu lokutshaja ibhetri ye-lithium-ion liphantsi kakhulu kwiqondo lobushushu eliphantsi, eliya kwenza ingozi kwii-electrode ezilungileyo nezingalunganga.Xa iqondo lobushushu lokutshaja ibhetri lingaphantsi kobushushu begumbi, i-electrode eqinisekileyo yebhetri isabela kwaye ibole ngokufudumeleyo, kwaye igesi kunye nobushushu obuveliswayo buqokelelana kwirhasi eyenziwe kwi-electrode elungileyo, ibangela ukuba iseli yande.Ukuba iqondo lokushisa liphantsi kakhulu ngexesha lokukhupha, izibonda ziya kuba zizinzile.Ukuze kugcinwe umsebenzi we-electrode engafanelekanga kunye ne-electrode efanelekileyo, ibhetri kufuneka ihlawulwe ngokuqhubekayo, ngoko ke, i-electrode esebenzayo esebenzayo kufuneka igcinwe kwindawo ethile kangangoko kunokwenzeka xa ishaja.

Ukubola kwamandla

Umthamo webhetri ubola ngokukhawuleza ngexesha lobushushu obuphantsi bokuhamba ngebhayisikile kwaye kunempembelelo ebalulekileyo kubomi bebhetri.Ukutshaja okuphantsi kobushushu kukhokelela ekutshintsheni umthamo ogqithisileyo kwi-electrode elungileyo kunye nengalunganga, nto leyo ekhokelela ekubunjweni kwe-lithium dendrites kwaye ngaloo ndlela ichaphazela ukusebenza kwebhetri.Ilahleko yamandla kunye nokuthotywa kwamandla ngexesha lomjikelo wokutshaja/wokukhutshwa kukwayeyona nto iphambili echaphazela ubomi bebhetri, kwaye ukubola kweLiCoSiO 2 cathode kunye neLiCoSiO 2 cathode kumaqondo obushushu aphezulu kuvelisa irhasi kunye namaqamza kunye ne-electrolyte eqinileyo, echaphazela amandla ombane. ubomi bebhetri.Ukusabela kwee-electrode ezilungileyo nezingalunganga nge-electrolyte kwiqondo lobushushu eliphantsi kuvelisa amaqamza aphazamisa i-electrode eyakhayo kunye nengalunganga ngexesha lomjikelo webhetri, nto leyo ebangela ukuba umthamo webhetri ubole ngokukhawuleza.

Ubomi bomjikelo

Ukongezwa kobomi bomjikelezo kuxhomekeke kwimeko ekhutshweyo yebhetri kunye ne-lithium ion concentration ngexesha lokutshaja.Uxinzelelo oluphezulu lwe-lithium ion luya kuthintela ukusebenza kwebhayisikile yebhetri, ngelixa ugxininiso lwe-lithium ephantsi luya kuthintela ukusebenza kwebhayisikile yebhetri.Njengoko ukutshaja kubushushu obuphantsi kuya kubangela ukuba i-electrolyte isabele ngobundlobongela, ngaloo ndlela ichaphazele i-electrode reaction, enokuthi ibangele unxibelelwano phakathi kwezinto ezisebenzayo kunye ne-negative electrode, nto leyo ebangela ukuba i-electrode engalunganga isabele kwaye ivelise isixa esikhulu segesi kunye negesi. amanzi, ngaloo ndlela ukwandisa ubushushu bebhetri.Xa i-lithium ion concentration ingaphantsi kwe-0.05%, ubomi bomjikelezo ngamaxesha angama-2 kuphela / ngosuku;xa ibhetri yokutshaja iphezulu kune-0.2 A / C, inkqubo yomjikelezo inokugcina amaxesha angama-8-10 / imini, ngelixa i-lithium dendrite concentration ingaphantsi kwe-0.05%, inkqubo yomjikelezo inokugcina amaxesha angama-6-7 / imini. .

Ukunciphisa ukusebenza kwebhetri

Kwiqondo lokushisa eliphantsi, ukulahlekelwa kwamanzi kuya kwenzeka kwi-electrode engafanelekanga kunye ne-diaphragm yebhethri ye-Li-ion, eya kukhokelela ekunciphiseni kokusebenza komjikelo kunye nomthamo wokutshaja webhetri;i-polarization yezinto ezilungileyo ze-electrode nazo ziya kubangela i-brittle deformation yezinto ezimbi ze-electrode, okubangelwa ukungazinzi kwe-lattice kunye ne-fenomenon transfer transfer;Ukuguquka kwamanzi, ukuguquguquka, ukuchithwa, i-emulsification kunye nemvula ye-electrolyte kuya kukhokelela ekunciphiseni ukusebenza komjikelo webhetri.Kwiibhetri ze-LFP, izinto ezisebenzayo kumphezulu webhetri ziyancipha ngokuthe ngcembe njengoko inani lentlawulo kunye nokukhutshwa landa, kunye nokunciphisa izinto ezisebenzayo kuya kubangela ukuhla kwamandla ebhetri;ngexesha lokuhlawula kunye nenkqubo yokukhupha, njengoko inani lentlawulo kunye nokukhutshwa landa, izinto ezisebenzayo kwi-interface iphinda ihlangane kwisakhiwo esiqinileyo nesithembekileyo sebhetri, esenza ibhetri ibe yinto ehlala ihleli kwaye ikhuselekile.


Ixesha lokuposa: Nov-15-2022