Citation: Mengqiu Yang, Yuanpeng Ji, Yunfa Dong, Botao Yuan, Liwei Dong, Yuanpeng Liu, Sue Hao, Chunhui Yang, Xiaoqiang Wu, Qingquan Kong, Jiecai Han, Weidong He. Talcum-doped composite separator with superior wettability and heatproof properties for high-rate lithium metal batteries[J]. Chinese Chemical Letters, ;2023, 34(1): 107087. doi: 10.1016/j.cclet.2021.12.079 shu

Talcum-doped composite separator with superior wettability and heatproof properties for high-rate lithium metal batteries

Mengqiu Yang ^a ,
Yuanpeng Ji ^a ,
Yunfa Dong ^b ,
Botao Yuan ^b ,
Liwei Dong ^a ,
Yuanpeng Liu ^b ,
Sue Hao ^{a, c} ,
Chunhui Yang ^{a, c} ,
Xiaoqiang Wu ^d ,
Qingquan Kong ^d ,
Jiecai Han ^b ,
Weidong He ^{b, d, e, *,}

a.
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150080, China
b.
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, and Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China
c.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150080, China
d.
School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
e.
Chongqing Research Institute, Harbin Institute of Technology, Chongqing 401151, China

weidong.he@hit.edu.cn

Received Date: 26 November 2021
Revised Date: 20 December 2021
Accepted Date: 28 December 2021
Available Online: 4 January 2022

Figures(4)

Separator is supposed to own outstanding thermal stability, superior wettability and electrolyte uptake, which is essential for developing high-rate and safe lithium metal batteries (LMBs). However, commercial polyolefin separators possess poor wettability and limited electrolyte uptake. For addressing this issue, we put forward a composite separator to implement above functions by doping layered-silicate (talcum) into polyvinylidene fluoride (PVDF). With significant improvement of electrolyte absorption benefiting from the strong adsorption energy values (-1.64 ~ -1.70 eV) between talcum and the electrolyte in lithium metal batteries, PVDF/Talcum (PVDF/TM) composite separator owns a small contact angle and superior electrolyte uptake. PVDF/TM composite separator with 10 wt% talcum (T-10) owns a tiny contact angle of 8°, while those of polypropylene (PP) and PVDF are 48° and 20° with commercial electrolyte. Moreover, the addition of thermotolerant talcum endows the T-10 composite separator with great thermostability, whose thermal shrinkage is only 5.39% at 150 ℃ for 0.5 h. The cell with LiFeO₄ cathode and the T-10 composite separator reaches 91.7 mAh/g in discharge capacity at 4.8 mA/cm² (10 C), far superior to that with pure PVDF separator (56.3 mAh/g) and PP (51.4 mAh/g).
- Lithium metal batteries,
- Composite separator,
- PVDF,
- Talcum,
- Wettability,
- Thermal stability
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