Citation: Miaomiao Su, Yifu Chen, Suqing Wang, Haihui Wang. Bifunctional separator with high thermal stability and lithium dendrite inhibition toward high safety lithium-ion batteries[J]. Chinese Chemical Letters, ;2023, 34(5): 107553. doi: 10.1016/j.cclet.2022.05.067 shu

Bifunctional separator with high thermal stability and lithium dendrite inhibition toward high safety lithium-ion batteries

Miaomiao Su ^a ,
Yifu Chen ^a ,
Suqing Wang ^{a, *,} ,
Haihui Wang ^{b, *,}

a.
School of Chemistry & Chemical Engineering, South China University of Technology, Guangzhou 510640, China
b.
School of Chemical Engineering, Tsinghua University, Beijing 100084, China

cesqwang@scut.edu.cn

Received Date: 19 April 2022
Revised Date: 10 May 2022
Accepted Date: 20 May 2022
Available Online: 23 May 2022

Figures(4)

Coating inorganic ceramic particles on commercial polyolefin separators has been considered as an effective strategy to improve thermostability of separator. However, the introduction of the coating layer could induce pore blockage on the surface of the polyolefin separator. Herein, a ceramic composite layer that consists of alumina nanoparticles (n-Al₂O₃) and halloysite nanotubes (HNTs) is designed to modify the polyethylene (PE) separator (the modified separator is denoted as AH-PE). The HNTs with hollow nanotubular structure construct a light skeleton and provide fast ion transport channels while Al₂O₃ particles function as heat-resistant fillers to inhibit the shrinkage of the separator at elevated temperatures. The total thickness of AH-PE separator is only 14 µm. Consequently, the mass increment of AH-PE separator decreases from 5 g/m² to 3.5 g/m², and the Gurley value reduces by 23%, compared with Al₂O₃ coated PE separator (A-PE). Due to the synergistic effects of Al₂O₃ and HNTs, AH-PE separator exhibits highly improved thermal stability (almost no shrinkage at 170 ℃ for 30 min), high Li⁺ transference number (up to 0.47), and long cycle life of 450 h for Li|Li cells. Moreover, the LiFePO₄/Li cells assembled with AH-PE separators demonstrate improved rate capability and safety performance.
- Separator,
- Lithium dendrite,
- Thermal stability,
- Halloysite nanotubes,
- Lithium-ion batteries
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