Premium
Low‐Cost and Heat‐Resistant Poly(catechol/polyamine)‐Silica Composite Membrane for High‐Performance Lithium‐Ion Batteries
Author(s) -
Zhu Tianming,
Chen Qiuyu,
Xie Dongming,
Liu Jiansheng,
Chen Xinli,
Nan Junmin,
Zuo Xiaoxi
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100256
Subject(s) - membrane , composite number , materials science , thermal stability , separator (oil production) , wetting , chemical engineering , polyethylene , coating , lithium ion battery , contact angle , composite material , chemistry , battery (electricity) , biochemistry , physics , power (physics) , quantum mechanics , engineering , thermodynamics
A composite membrane based on SiO 2 and a low‐cost poly(catechol/polyamine) (PCPA) multicomponent system was prepared by using a simple dip‐coating processes. The results indicate that the formation of an inorganic/organic composite coating on the surface of the polyethylene (PE) separator is beneficial for improving the comprehensive performance, especially for the thermal stability and wettability. Compared to the PE separator, the thermal stability of the PE@SiO 2 ‐PCPA composite membrane is greatly improved, showing a higher decomposition temperature (426 °C) and a smaller heat shrinkage rate at 160 °C. Moreover, the Li/LiCoO 2 battery assembled with the PE@SiO 2 ‐PCPA composite membrane shows an excellent initial discharge capacity and a remarkable capacity retention (171.5 mAh g −1 , 86.1 %) at 4.4 V after 200 cycles at 0.5 C, which much higher than the PE membrane (165.2 mAh g −1 , 61.4 %). This study provides a potential application for membranes with low cost, high thermal stability, and good wettability in the field of lithium‐ion batteries.