Lithium bhatiri overcharge michina uye anti-overcharge zviyero (2)

Mubepa rino, kuwandisa kwekuita kwe40Ah pouch bhatiri ine yakanaka electrode NCM111 + LMO inodzidzwa kuburikidza nekuyedza uye simulations.Iwo machaji ekuwedzera ari 0.33C, 0.5C uye 1C, zvichiteerana.Saizi yebhatiri ndeye 240mm * 150mm * 14mm.(yakaverengerwa zvinoenderana neyakayerwa voltage ye3.65V, vhoriyamu yayo chaiyo simba ingangoita 290Wh/L, iyo ichiri yakadzikira)

Iyo voltage, tembiricha uye yemukati kuramba shanduko panguva yekuchaja maitiro inoratidzwa muMufananidzo 1. Inogona kukamurwa zvakaganhurwa kuita nhanho ina:

Danho rekutanga: 1

Nhanho yechipiri: 1.2

Nhanho yechitatu: 1.4

Nhanho yechina: SOC> 1.6, kudzvanywa kwemukati kwebhatiri kunodarika muganhu, casing inoputika, diaphragm inodzikira nekuremara, uye bhatiri rinopisa rinomhanya.Dunhu pfupi rinoitika mukati mebhatiri, huwandu hukuru hwesimba hunoburitswa nekukurumidza, uye tembiricha yebhatiri inokwira zvakanyanya kusvika 780 ° C.

Kupisa kunogadzirwa panguva yekuwedzeresa kunosanganisira: reversible entropy heat, Joule heat, chemical reaction heat uye kupisa kunoburitswa nemukati pfupi dunhu.Kupisa kwemakemikari reaction kunosanganisira kupisa kunoburitswa nekuparara kweMn, kuita kwesimbi lithium ine electrolyte, oxidation ye electrolyte, kuparara kweSEI firimu, kuparara kweiyo negative electrode uye kuparara kweiyo yakanaka electrode. (NCM111 uye LMO).Tafura 1 inoratidza shanduko ye enthalpy uye activation simba rekuita kwega kwega.(Chinyorwa ichi hachicherechedze maitiro epadivi evanosunga)

Mufananidzo 3 kuenzanisa kweyero yekugadzira kupisa panguva yekuwedzeredza neyakasiyana yekuchaja mafungu.Mhedziso dzinotevera dzinogona kutorwa kubva Mufananidzo3:

1) Sezvo iyo yekuchaja ikozvino inowedzera, iyo yekupisa yekumhanya nguva inofambira mberi.

2) Kugadzirwa kwekupisa panguva yekuwedzeredza kunotongwa neJoule kupisa.SOC <1.2, iyo yakazara kupisa kugadzirwa kwakaenzana neJoule kupisa.

3) Muchikamu chechipiri (1

4) SOC> 1.45, kupisa kunobudiswa nekuita kwesimbi lithium uye electrolyte kuchapfuura Joule kupisa.

5) Kana SOC> 1.6, decomposition reaction pakati peSEI film nenegative electrode inotanga, kupisa kwekugadzirwa kwe electrolyte oxidation reaction kunowedzera zvakanyanya, uye huwandu hwese hwekugadzira kupisa hunosvika pakukosha kwepamusoro.(Tsanangudzo dziri muna 4 ne5 muzvinyorwa hadzienderane nemifananidzo, uye mifananidzo iri pano ichakunda uye yakagadziridzwa.)

6) Munguva yekuwedzera kwekuita, kuita kwesimbi lithium ine electrolyte uye oxidation ye electrolyte ndiyo maitiro makuru.

Kuburikidza nekuongorora kuri pamusoro, kugona kweoxidation ye electrolyte, kugona kweelectrode yakaipa, uye tembiricha yekutanga yekumhanya kwekushisa ndizvo zvinhu zvitatu zvakakosha pakuchajisa.Mufananidzo 4 unoratidza kukanganisa kwematatu akakosha paramita pane yakawandisa kuita.Zvinogona kuonekwa kuti kuwedzera kwekugona kwe oxidation ye electrolyte kunogona kuvandudza zvakanyanya kushanda kwepamusoro kwebhatiri, nepo kukwanisa kwe electrode yakaipa kune zvishoma pakuita kwekuwedzerwa.(Nemamwe mazwi, iyo yakakwira-voltage electrolyte inobatsira kuvandudza kuwedzeredza kuita kwebhatiri, uye kuwedzera chiyero cheN/P hakuna zvazvinoita pakushaja kuita kwebhatiri.)

References

D. Ren et al.Zvinyorwa zveMagetsi eMasimba 364(2017) 328-340