Isizathu somgomo wokusebenza webhethri ye-lithium ion kanye nembangela yokunciphisa

2022/04/08

Umbhali :Iflowpower -Umhlinzeki Wesiteshi Samandla Esiphathekayo

Ibhethri ye-lithium-ion ibhethri lesibili elishesha kakhulu ngemva kwebhethri le-cadmium ne-hydrogen-nickel. Abasebenzisi abasetshenzisiwe kufanele bonke bazi ukuthi ibhethri ye-lithium izonciphisa umthamo ngemuva kokusebenzisa isikhathi esithile. Lesi sihloko sifingqa futhi sihlaziye izizathu ezingenzeka zesimiso sokusebenza samabhethri e-lithium ion, kanye nokunciphisa umthamo, ngithemba ukukusiza.

Isimiso somsebenzi webhethri ye-lithium ion Ibhethri le-lithium ion ibhethri lesibili (ibhethri elishajekayo), elithembele kakhulu kuma-ion e-lithium ukuhamba phakathi kwama-electrode avumayo noma angalungile. Phakathi nenqubo yokushaja nokukhipha, i-Li + ifakwe futhi ishiywe phakathi kwama-electrode amabili: Uma ishaja, i-Li + ikhuphuka isuka ku-electrode enhle, futhi i-electrolyte ifakwe ku-electrode engalungile, isigxobo esingalungile sisesimweni se-lithium; ukukhishwa kuphambene. Ukukhishwa kwebhethri ye-lithium kusekelwe ekuphenduleni kwe-chemical oxidation.

Lapho ukukhishwa kukhishwa, kulapho sisebenzisa ibhethri ukuze sidle amandla, i-electrode yayo enhle izoshumeka i-lithium ion, i-electrode negative lithium ion. Uma ukushaja, okuphambene nakho. Une-voltage ethile yokwenza isilinganiso esithile samandla ukuze ibhethri ikhiqize ugesi.

Phakathi nomjikelezo ngamunye wokushaja nokukhipha, i-lithium ion (Li) isebenza njengesithwali sokuphatha samandla kagesi, umnyakazo osuka ku-electrode ephozithivu → i-electrode eyinegethivu → i-electrode ephozithivu evela ezintweni zikagesi ezinhle nezingezinhle, futhi iguqulela amandla amakhemikhali namandla kagesi ngabanye. Ukusebenzisa ukudluliswa kwenkokhelo, lesi isimiso esiyisisekelo "sebhethri ye-lithium ion". Ngenxa ye-electrolyte, ifilimu yokuhlukanisa, njll.

iyisivikeli se-electron, ngakho-ke lokhu kusakazwa akusuki emuva naphambili phakathi kwezigxobo ezinhle nezingezinhle, futhi zibamba iqhaza kuphela ekuphenduleni kwamakhemikhali kwe-electrode. Izimbangela zokuncishiswa komthamo webhethri le-lithium ibhethri lesibili elishesha kakhulu ngemva kwebhethri le-cadmium ne-hydrogen nickel. Ukusetshenziswa kwamabhethri e-lithium-ion kuncike kakhulu ekuzinzeni kwawo komjikelezo wokushaja nokukhipha, namanye amabhethri esibili , amabhethri e-Lithium-ion awanakugwenywa phakathi nomjikelezo.

1 Ukwakhiwa kwezingxenye. Ukuguqulwa kwezingxenye kungaholela kalula ekushintsheni kokudluliswa kwesigaba kanye nesakhiwo sesigaba somzimba. Ukuguqulwa kwesigaba se-electrode material kungabangela izinguquko kumingcele ye-lattice nokungafani kwe-lattice, ngaleyo ndlela kudala ukucindezeleka okubangelwa ukuchotshozwa kokusanhlamvu, futhi kubangela ukusakazeka kokuqhekeka, okuholela ekulimaleni kwemishini esakhiweni sento, ngaleyo ndlela kubangele ukuncishiswa kokusebenza kwe-electrochemical.

2. Izinto ezingezinhle ze-electrode ezivame ukusetshenziswa esakhiweni sezinto ezingezinhle ze-electrode yi-carbon material, i-lithium titanate, njll., leli phepha lihlaziya i-graphite engalungile evamile.

Ukuncishiswa komthamo webhethri ye-lithium kwenzeka okokuqala, kulesi sigaba, i-SEI yakheka ebusweni be-electrode engalungile, idla ingxenye ye-lithium ion. Njengoba kusetshenziswa ibhethri ye-lithium, ukuguqulwa kwesakhiwo se-graphite nakho kungabangela ukwehla kwamandla ebhethri. Nakuba i-morphology ye-graphite igcinwa, ingxenye ye-crystal surface yayo (002) inkulu, okuholela ekutheni kube nosayizi omncane wokusanhlamvu endaweni ye-C-axis, futhi ukuguqulwa kwesakhiwo se-crystal kubangela ukuqhekeka kwe-carbon material, okubuye kube khona. iphazamisa ubuso bendawo engalungile.

Ifilimu futhi ikhuthaza ukulungiswa kwefilimu ye-SEI, ukukhula ngokweqile kwefilimu ye-SEI kudla i-lithium esebenzayo, ngaleyo ndlela kubangele ukuncishiswa kwamandla okungahlehlisi amabhethri e-lithium. 3. I-electrolyte ikakhulukazi ihlanganisa izingxenye ezintathu ze-solvent, i-electrolyte kanye nezithasiselo.

Ukubola kwe-solvent, ukubola kwe-electrolyte kungabangela ukulahlekelwa umthamo webhethri ye-lithium. Ukubola nokusabela ohlangothini kwe-electrolyte kuyisici esiyinhloko sokuncishiswa kwamandla ebhethri ye-lithium. Kungakhathaliseki ukuthi iyiphi impahla ye-electrode enhle nengalungile, okuyinto inqubo, ngokujikeleza kwebhethri ye-lithium, ukubola kwe-electrolyte kanye nesixhumi esibonakalayo phakathi kwezinto ezivamile nezingalungile ze-electrode Ukusabela kungabangela ukuncishiswa kwamandla.

4, ukusabela okunembayo okuqondile kuphansi kakhulu uma i-electrode esebenzayo ehlobene ne-electrode eyinegethivu esebenzayo iphansi kakhulu, kulula ukuyishaja. Uguquko oluhle lwebhethri ye-lithium lubangele ukulahleka kwamandla ikakhulukazi ngenxa yokukhiqizwa kwezinto ezingenasici ze-electrochemical (ezifana ne-CO3O4, MN2O3, njll.), zicekela phansi ibhalansi yamandla phakathi kwama-electrode, futhi ukulahlekelwa kwawo amandla akubuyiseleki emuva.

I-5, ukungazinzi kwe-electrode ku-electrode enhle ukungazinzi kwezinto ezisebenzayo ngesikhathi sokushaja, kusabela ngokusabela kwe-electrolyte. Kuthinta izici ezingaguquki zempahla ye-electrode ephozithivu, ukonakala kwesakhiwo sempahla ye-electrode ephozithivu, okuqukethwe kwekhabhoni emnyama, ephakeme kakhulu yamandla okushaja, lapho isici esihle sesakhiwo se-electrode kuyisisindo sezici. Njengoba indawo etholakalayo yebhethri ye-lithium incishisiwe, amandla okugcwalisa ayancipha, futhi isikhathi sokushaja siyafinyezwa kancane kancane.

Ezimweni eziningi, umthamo webhethri ye-lithium ukubola ngokomugqa ngenxa yomjikelezo womjikelezo nokuguga. 6. Ukushaja izinga lokushisa kwesitoreji kanye nomjikelezo wokukhipha akusona isizathu kuphela sokunciphisa umthamo webhethri ye-lithium, futhi ibhethri ye-lithium ekushiseni okuphezulu kungabangela nokunciphisa umthamo.

Ibhethri ye-lithium eshajwe ngokugcwele izobangela ukulahlekelwa umthamo ongu-35% esimweni esingu-40 ° C (104 ° F) unyaka owodwa ngaphandle kokusetshenziswa. Ukushaja okushesha kakhulu nakho kuyingozi ebhethrini, okuzonciphisa impilo yebhethri, okusobala kakhulu kumabhethri e-lithium e-monomer. Iphakethe lebhethri le-lithium lingaphezulu kwamandla, kodwa licashile ikakhulukazi ngenxa yomehluko wamabhethri eseli.

Izidingo zebhethri le-lithium zivame ukubala ukuncishiswa komthamo walo kanye nempilo yokugcina. Ukuncishiswa kwamandla ukuya ku-80% kudinga ukushintshwa kwamaphakethe ebhethri, futhi umkhawulo wokugcina wempilo wephakethe lebhethri le-lithium kufanele ushintshe ngokuya ngokusetshenziswa kohlelo lokusebenza, kanye nokuthandwa ngumsebenzisi kanye nesiqinisekiso senkampani.

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