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Heat‐Resistant Trilayer Separators for High‐Performance Lithium‐Ion Batteries
Author(s) -
Feng Chao,
Wang Xuchang,
Zeng Guangfeng,
Chen Dongjiang,
Lv Weiqiang,
Han Yupei,
Jian Xian,
Dou Shi Xue,
Xiong Jie,
He Weidong
Publication year - 2020
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900504
Subject(s) - separator (oil production) , materials science , thermal runaway , hexafluoropropylene , thermal stability , polyolefin , overcharge , flammable liquid , electrolyte , battery (electricity) , composite material , electrode , chemical engineering , polymer , layer (electronics) , waste management , chemistry , engineering , tetrafluoroethylene , power (physics) , physics , quantum mechanics , copolymer , thermodynamics
High‐performance rechargeable lithium‐ion batteries (LIBs) are central for electric vehicles and portable electronics. However, battery thermal runaway and explosion accidents in practical applications have aroused considerable debates on battery safety. The safety issues are directly associated with the flammable polyolefin separators and organic liquid electrolytes. Herein, a poly(vinylidene fluoride‐co‐hexafluoropropylene)/Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 /poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP/LLZTO/PVDF‐HFP) trilayer separator with remarkable flammable retardancy and thermal stability is designed. The outer PVDF‐HFP layers lead to compatible interfaces with battery electrodes, and the inner LLZTO layer enhances the thermal stability with subtle deformation at 300 °C. LiFePO 4 half batteries assembled with the trilayer separator own a discharge capacity up to 153 mAh g −1 at 0.5 C and capacity retention up to 95% over 200 cycles. This work provides a new avenue to safe and high‐performance LIBs.