| Autor: |
Hou, Junxian, Lu, Languang, Wang, Li, Ohma, Atsushi, Ren, Dongsheng, Feng, Xuning, Li, Yan, Li, Yalun, Ootani, Issei, Han, Xuebing, Ren, Weining, He, Xiangming, Nitta, Yoshiaki, Ouyang, Minggao |
| Předmět: |
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| Zdroj: |
Nature Communications; 10/9/2020, Vol. 11 Issue 1, p1-11, 11p |
| Abstrakt: |
Concentrated electrolytes usually demonstrate good electrochemical performance and thermal stability, and are also supposed to be promising when it comes to improving the safety of lithium-ion batteries due to their low flammability. Here, we show that LiN(SO2F)2-based concentrated electrolytes are incapable of solving the safety issues of lithium-ion batteries. To illustrate, a mechanism based on battery material and characterizations reveals that the tremendous heat in lithium-ion batteries is released due to the reaction between the lithiated graphite and LiN(SO2F)2 triggered thermal runaway of batteries, even if the concentrated electrolyte is non-flammable or low-flammable. Generally, the flammability of an electrolyte represents its behaviors when oxidized by oxygen, while it is the electrolyte reduction that triggers the chain of exothermic reactions in a battery. Thus, this study lights the way to a deeper understanding of the thermal runaway mechanism in batteries as well as the design philosophy of electrolytes for safer lithium-ion batteries. Concentrated electrolytes display superior thermal stability due to their non-flammability nature. Here, the authors show that LiN(SO2F)2-based concentrated electrolytes are incapable of solving the safety issues due to heat release during reaction between the lithiated graphite and electrolyte. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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