Thermal runaway of Lithium-ion batteries employing LiN(SO2F)2-based concentrated electrolytes

Junxian Hou, Languang Lu, Li Wang (), Atsushi Ohma, Dongsheng Ren, Xuning Feng, Yan Li, Yalun Li, Issei Ootani, Xuebing Han, Weining Ren, Xiangming He, Yoshiaki Nitta and Minggao Ouyang ()
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Junxian Hou: Tsinghua University
Languang Lu: Tsinghua University
Li Wang: Tsinghua University
Atsushi Ohma: Advanced Materials and Processing Laboratory, Nissan Motor Co., Ltd., 1, Natsushima-cho
Dongsheng Ren: Tsinghua University
Xuning Feng: Tsinghua University
Yan Li: Tsinghua University
Yalun Li: Tsinghua University
Issei Ootani: Advanced Materials and Processing Laboratory, Nissan Motor Co., Ltd., 1, Natsushima-cho
Xuebing Han: Tsinghua University
Weining Ren: Tsinghua University
Xiangming He: Tsinghua University
Yoshiaki Nitta: Advanced Materials and Processing Laboratory, Nissan Motor Co., Ltd., 1, Natsushima-cho
Minggao Ouyang: Tsinghua University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-18868-w

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