Izizathu zokuhlaziya ukujula kwamabhethri e-lithium ion

Awdur: Iflowpower - Proveedor de centrales eléctricas portátiles

Ngenxa yokuphila kwayo okuphezulu, ibhethri ye-lithium-ion isetshenziswa kabanzi, ngokunwetshwa kwesikhathi sokusetshenziswa, inkinga yokuqhuma, ukusebenza kokuphepha akulungile futhi ukuncipha kokujikeleza nakho kubi kakhulu, okubangela ukuhlaziya nokucindezelwa kokujula kwebhethri ye-lithium Ucwaningo. Ngokusho kocwaningo lokuhlola kanye nesipiliyoni sokuthuthukiswa, umbhali uhlukanisa izimbangela zamabhethri e-lithium zibe izigaba ezimbili, enye i-bulging ebangelwa ukushuba kwebhethri (okwesibili, ngenxa yokuqhuma kwe-electrolytic liquid oxidation). Kumasistimu ebhethri ahlukene, izici ezivelele zogqinsi lwebhethri zihlukile.

Isibonelo, kubhethri ye-electrode ye-lithium titanate negative, izici eziyinhloko zokuqhuma yizigubhu; ohlelweni lwe-electrode eyi-graphite negative, ukujiya kogqinsi kanye nokuqhuma koMthetho wokuhlinzeka ngegesi. Okokuqala, ubukhulu besigxobo se-electrode buyashintshwa ekusetshenzisweni kwamabhethri e-lithium, futhi ubukhulu besigxobo se-electrode bunoshintsho olukhulu, ikakhulukazi i-electrode eyi-graphite negative. Ngokusho kwedatha ekhona, ibhethri ye-lithium idlulile isitoreji esiphezulu sokushisa kanye nokujikeleza, okujwayele ukugubha, ngesilinganiso sokukhula kokuqina okungaba ngu-6% kuya ku-20%, lapho isilinganiso esihle sokunwetshwa kwe-polar singama-4% kuphela, futhi isilinganiso esibi sokwandisa singama-20%.

Imbangela eyinhloko yokuqunjelwa kogqinsi lwezinguquko zebhethri ye-lithium ithintwa ingqikithi yegraphite. I-electrode graphite eyinegethivu yakha i-LICX (LIC24, LiC12 ne-LIC6, njll.), kanye nokushintsha kwesikhala somugqa, okuholela ekwakhekeni kwengcindezi yangaphakathi ye-microscopic, okuholela ekunwebeni kwe-electrode engalungile.

Isibalo esingezansi siyishadi lesakhiwo sesakhiwo sepuleti le-electrode elingalungile legraphite endaweni kanye nokushaja nokukhipha. Ukunwetshwa kwe-electrode engalungile ye-graphite kubangelwa ikakhulukazi ukunwetshwa okungasebenzi. Le ngxenye yokwandiswa ihlobene kakhulu nesakhiwo sosayizi wezinhlayiyana, i-adhesive agent kanye neshidi lesigxobo.

Ukunwetshwa kwe-electrode engemihle kubangela ukuba umgogodla uwohloke, futhi i-electrode yakheka phakathi kwe-diaphragm, futhi izinhlayiya ze-electrode ezingezinhle zakha i-microcrack, ifilimu eqinile ye-electrolyte phase interface (SEI) iphukile futhi ihlanganiswe kabusha, idla i-electrolyte, futhi ivimbela ukusebenza okujikelezayo. Kunezici eziningi ezithinta izigxobo ze-electrode ezimbi, futhi uhlobo lwe-adhesive kanye nemingcele yesakhiwo seshidi le-polar yizinto ezimbili ezibaluleke kakhulu. Ingcina evame ukusetshenziswa ku-graphite negative electrode i-SBR, i-adhesive modulus elastic elastic, amandla ahlukene emishini, kanye nemiphumela ehlukene kugqinsi lwepuleti.

Amandla aginqikayo ngemva kokumbozwa kokuqeda nawo athintwa ukushuba kwepuleti le-electrode elingalungile ebhethrini. Ngaphansi kwengcindezi efanayo, imodulus enwebekayo yokunamathisela ibe nkulu, iba yincane ishelufu yomzimba ye-polarity, lapho ishaja, ngenxa yokushumeka kwe-Li +, ukunwetshwa kwe-graphite lattice; ngesikhathi esifanayo, ngenxa yokuguqulwa kwezinhlayiya ze-electrode ezingalungile kanye ne-SBR, ukucindezeleka kwangaphakathi kukhishwa ngokuphelele , Yenza izinga lokukhulisa elibi likhuphuke kakhulu, i-SBR isesiteji sokuguqulwa kwepulasitiki. Le ngxenye yesilinganiso sokunwetshwa ihlobene ne-elastic modulus ye-SBR, eholela ekukhudlwana kwe-elastic modulus namandla e-SBR, kanye nokunwebeka okuncane okungenakuhlehliswa.

Uma inani le-SBR lingahambisani, ingcindezi ihlukile lapho i-polar roller icindezelwa, futhi umehluko wengcindezi ubangela ukucindezeleka okusalayo okukhiqizwa yisigxobo, kukhulu ukucindezeleka okusalayo, okuholela ekwandiseni kwe-shelving pre-physical, ugesi ogcwele kanye nesilinganiso sokwandisa amandla angenalutho; okuqukethwe kwe-SBR kuncane, ingcindezi yokugingqika incane, amashalofu angokwenyama ayancipha, isilinganiso sokunwetshwa kogesi wangaphambi kukagesi kanye ne-electrocositis engenalutho, ukunwebeka okungalungile kubangela ukuthi umgogodla uwohloke, kuthinte okungekuhle Izinga le-lithium yi-lithium ne-Li + izinga lokusabalalisa, ngaleyo ndlela idale umthelela ongathi sína ekusebenzeni komjikelezo webhethri. Okwesibili, ukungena kwegesi kwangaphakathi kwebhethri eningi okubangelwa igesi yebhethri yisinye isizathu esibalulekile esibangela ukuqhuma kwebhethri, kungakhathaliseki ukuthi umjikelezo wokushisa kwebhethri, umjikelezo wokushisa ophakeme, ukushisa okuphezulu okushisa, ukukhiqiza amadigri ahlukene egesi eqhumayo. Ngokwemiphumela yocwaningo lwamanje, ingqikithi yokuvuvukala komnyombo kagesi ibangelwa ukubola kwe-electrolyte.

Kunezimo ezimbili zokubola kwe-electrolyte, enye iwukungcola kwe-electrolyte, njengomswakama nokungcola kwensimbi ukubola uketshezi lwe-electrolytic, kanti enye iphansi kakhulu yoketshezi lwe-electrolytic, oludala ukubola ngesikhathi sokushaja, futhi kuma-electrolyte Solvents afana ne-EC, i-DEC akhiqizwa ngemuva kokuthola ama-electron, futhi imiphumela eqondile ye-ehydrocarbon, i-ehydrocarbon njll. Ngemuva kokuthi umhlangano webhethri ye-lithium usuqediwe, inani elincane legesi likhiqizwa ngesikhathi senqubo enqunywe kusengaphambili, futhi lawa magesi angenakugwemeka, kanye nalokho okubizwa ngokuthi umthombo wokulahlekelwa kwamandla kagesi ongenakuguqulwa. Phakathi nenqubo yokuqala yokushaja nokukhipha, ama-electron afinyelela isisombululo se-electrolytic ngesisombululo se-electrolytic se-electrode engalungile ngemva kwesifunda sangaphandle, enza igesi.

Kule nqubo, i-SEI yakheka ebusweni be-electrode engalungile ye-graphite, ngokushuba kokwanda kwe-SEI, ama-electron akakwazi ukungena kwi-oxidation eqhubekayo ye-electrolyte. Ngesikhathi sempilo yebhethri, umthamo wegesi wangaphakathi uzokhula kancane kancane, ngenxa yembangela yokungcola noma umswakama ku-electrolyte noma ku-electrolyte. Ukuba khona kwe-electrolyte kudinga ukukhishwa okukhulu, futhi ukulawulwa komswakama akuqinile.

Isixazululo se-electrolytic ngokwaso asiqinile, futhi iphakethe lebhethri alifakwanga ngokuqinile emanzini, ukukhishwa kwe-angular kubangelwa, futhi ukusetshenziswa ngokweqile kwebhethri kuzosheshisa ukukhiqizwa kwegesi yebhethri. Isivinini, okubangela ukwehluleka kwebhethri. Kumasistimu ahlukene, inani lokukhiqizwa kwebhethri lihlukile.

Kubhethri ye-electrode engalungile ye-graphite, imbangela yokukhiqizwa kwegesi ngokuyinhloko ibangelwa ukwakheka kwefilimu ye-SEI, umswakama ebhethri weqiwe, futhi ukugeleza kwamakhemikhali akuvamile, iphakheji impofu, futhi isilinganiso se-florescent yebhethri ku-lithium titanate Isistimu yebhethri ye-NCM kufanele ibe yingozi kakhulu. Ngaphandle kokungcola, umswakama kanye nezinqubo ku-electrolyte, omunye umehluko ovela ku-graphite negative electrode ukuthi i-lithium titanate ayikwazi ukufana nebhethri ye-electrode engalungile ye-graphite, eyenza ifilimu ye-SEI ebusweni bayo, ivimbele ukusabela kwayo kwe-Electrolyte. I-electrolyte ihlale ixhumene ngokuqondile ne-Li4Ti5O12 ngesikhathi sokushaja nokukhipha, okuholela ekunciphiseni okuqhubekayo kobuso bezinto ze-Li4Ti5O12, okungenzeka kube yimbangela ye-Li4Ti5o12 yebhethri flatulence.

Izingxenye eziyinhloko zegesi yi-H2, CO2, CO, CH4, C2H6, C2H4, C3H8, njll. Lapho i-lithium titanate icwiliswa ngokwehlukana ku-electrolyte, i-CO2 kuphela ikhiqizwa, futhi ngemva kokulungiselela ibhethri ngezinto ze-NCM, amagesi akhiqizwayo ahlanganisa i-H2, CO2, CO, kanye nenani elincane lama-hydrocarbons angamagesi, futhi ngemva kwebhethri, kuphela emjikelezweni Lapho ishaja futhi ikhipha, i-H2 ikhiqizwa, futhi ku-5% okuqukethwe kwegesi kudlula i-H2%. Lokhu kubonisa ukuthi igesi ye-H2 ne-CO izokhiqizwa ngesikhathi sokushajwa nokuphuma.

I-LIPF6 ikhona ku-electrolyte: PF5 iyi-asidi enamandla kakhulu, okulula ukubangela ukubola kwe-carbonate, futhi inyuse inani le-PF5 ngokukhuphuka kwezinga lokushisa. I-PF5 isiza ekuboleni kwe-electrolyte, ikhiqize i-CO2, i-CO ne-CXHY igesi. Ngokocwaningo olufanele, ukukhiqizwa kwe-H2 kutholakala emanzini okulandelela ku-electrolyte, kodwa okuqukethwe kwamanzi ku-electrolyte evamile cishe ku-20 ¡Á 10-6, okuphansi kakhulu ku-Isivuno se-H2.

Ukuhlolwa kwe-Shanghai Jiaotong University Wu Kai kwasetshenziswa njengebhethri legraphite / NCM111. Isiphetho saphetha ngokuthi umthombo we-H2 ukubola kwe-carbonate ngaphansi kwamandla aphezulu. Njengamanje, kunezixazululo ezintathu zokucindezelwa kwamabhethri e-lithium titanate.

, Uhlelo lokuncibilikisa; okwesithathu, ngcono inqubo yebhethri ubuchwepheshe.