Indlela yokushajwa kwebhethri ye-lithium nezinyathelo zokunqanda ukushajwa (2)

Kuleli phepha, ukusebenza kokushajwa ngokweqile kwebhethri lesikhwama esingu-40Ah eline-electrode ephozithivu ye-NCM111+LMO kufundwa ngokuhlolwa nokulingisa.Imisinga yokushajwa ngokweqile ingu-0.33C, 0.5C no-1C, ngokulandelana.Usayizi webhethri ngu-240mm * 150mm * 14mm.(kubalwa ngokuya nge-voltage elinganiselwe engu-3.65V, amandla ayo athize acishe abe ngu-290Wh/L, asephansi kakhulu)

I-voltage, izinga lokushisa kanye nezinguquko zokumelana kwangaphakathi phakathi nenqubo yokukhokhiswa ngokweqile kuboniswa esithombeni 1. Ingase ihlukaniswe izigaba ezine:

Isigaba sokuqala: 1

Isigaba sesibili: 1.2

Isigaba sesithathu: 1.4

Isigaba sesine: I-SOC>1.6, ukucindezela kwangaphakathi kwebhethri kweqa umkhawulo, i-casing igqabuka, i-diaphragm iyashwabana futhi yonakale, kanye nokubaleka kwebhethri okushisayo.Ukujikeleza okufushane kwenzeka ngaphakathi kwebhethri, inani elikhulu lamandla likhishwa ngokushesha, futhi izinga lokushisa lebhethri likhuphuka kakhulu liye ku-780 ° C.

Ukushisa okukhiqizwa phakathi nenqubo yokukhokhiswa ngokweqile kuhlanganisa: ukushisa kwe-entropy okubuyisela emuva, ukushisa kwe-Joule, ukushisa okusabela kwamakhemikhali nokushisa okukhishwe yisekethe yangaphakathi emfishane.Ukushisa kokusabela kwamakhemikhali kuhlanganisa ukushisa okukhishwe ngokuhlakazeka kwe-Mn, ukusabela kwe-lithium yensimbi ne-electrolyte, i-oxidation ye-electrolyte, ukubola kwefilimu ye-SEI, ukubola kwe-electrode engemihle kanye nokubola kwe-electrode eyakhayo. (NCM111 kanye ne-LMO).Ithebula 1 libonisa ushintsho lwe-enthalpy namandla okuqalisa kokusabela ngakunye.(Le ndatshana ikuziba ukusabela okuseceleni kwama-binder)

Isithombe sesi-3 siqhathanisa izinga lokukhiqiza ukushisa phakathi nokushajwa okungaphezu kwamandla okushaja ahlukahlukene.Iziphetho ezilandelayo zingathathwa esithombeni3:

1) Njengoba ukushaja kwamanje kukhuphuka, isikhathi sokushisa esishisayo siyathuthuka.

I-2) Ukukhiqizwa kokushisa ngesikhathi sokushajwa ngokweqile kulawulwa ukushisa kwe-Joule.I-SOC<1.2, inani lokukhiqizwa kokushisa lilingana ngokuyisisekelo nokushisa kwe-Joule.

3) Esigabeni sesibili (1

4) I-SOC> 1.45, ukushisa okukhishwe ukusabela kwe-lithium yensimbi ne-electrolyte kuzodlula ukushisa kwe-Joule.

5) Uma i-SOC>1.6, ukusabela kokubola phakathi kwefilimu ye-SEI kanye ne-electrode eyinegethivu kuqala, izinga lokukhiqiza ukushisa lokusabela kwe-electrolyte oxidation likhuphuka kakhulu, futhi izinga lokukhiqiza ukushisa eliphelele lifinyelela inani eliphakeme.(Izincazelo ku-4 no-5 ezincwadini azihambisani ngandlela thize nezithombe, futhi izithombe lapha zizophumelela futhi zilungisiwe.)

I-6) Ngesikhathi senqubo yokukhokhiswa ngokweqile, ukusabela kwe-lithium yensimbi nge-electrolyte kanye ne-oxidation ye-electrolyte yizona eziyinhloko.

Ngokuhlaziya okungenhla, amandla e-oxidation e-electrolyte, amandla e-electrode engeyinhle, kanye nezinga lokushisa lokuqala lokubaleka kwe-thermal yimingcele emithathu ebalulekile yokushajwa ngokweqile.Isithombe sesi-4 sibonisa umthelela wamapharamitha amathathu abalulekile ekusebenzeni kokukhokhiswa ngokweqile.Kungabonakala ukuthi ukwanda kwamandla e-oxidation e-electrolyte kungathuthukisa kakhulu ukusebenza kokushajwa ngokweqile kwebhethri, kuyilapho amandla e-electrode engalungile enomthelela omncane ekusebenzeni kokushajwa ngokweqile.(Ngamanye amazwi, i-electrolyte ene-voltage ephezulu isiza ukuthuthukisa ukusebenza kwebhethri, futhi ukukhulisa isilinganiso se-N/P kunomphumela omncane ekusebenzeni kokushajwa ngokweqile kwebhethri.)

Izithenjwa

D. Ren et al.Ijenali Yemithombo Yamandla 364(2017) 328-340