材料科学
阴极
氧化物
环氧乙烷
纳米技术
自行车
聚乙烯
接口(物质)
光电子学
化学工程
乙烯
复合材料
电气工程
化学
工程类
聚合物
冶金
共聚物
生物化学
催化作用
考古
毛细管数
毛细管作用
历史
作者
Keding Chen,Zidong Zhang,Zelin Liu,Jin Gong,Haoyu Xiao,Yang Li,Jingchao Chai,Yun Zheng,Yuyu Li,Zhihong Liu,Ming‐Hua Xie,Wei Zhang
标识
DOI:10.1016/j.nxmate.2024.100228
摘要
The poly (ethylene oxide) (PEO) solid polymer electrolytes suffer from narrow electrochemical stability window and cannot match high voltage lithium cobalt oxide (LCO) cathode. Herein, an ultrathin Al2O3 nanolayer was uniformly deposited on the surface of LCO via powder atomic layer deposition (PALD) to realize poly (ethylene oxide) polymer electrolyte cycling stability. The PEO solid polymer electrolyte contains 20 % (w/w) lithium difluoro(oxalate)borate (LiDFOB) and 7.5 % (w/w) lithium titanium aluminum phosphate (LATP) with cellulose nonwoven as a support substrate. The electrolyte exhibitsionic conductivity of 1.2×10−4 S cm−1, an electrochemical stability window of 4.5 V (vs. Li+/Li) and lithium-ion transference number of 0.38. Al2O3@LCO/PEO-LiDFOB20%-LATP7.5%/Li cell at high cut-off 4.5 V delivered better initial discharge specific capacity of 178.5 mAh g−1 and achieved a capacity retention ratio of 81.6 % after 200 cycles under 0.1 C at 50 °C. Further analysis showed that Al2O3 layer served as stable a protective layer to suppress the generation of strong oxidative Co4+ and O– species and separate from the PEO solid polymer electrolyte, inhibiting the side reactions at the cathode-side interface. Therefore, architecting precise and ultrathin protective nanolayer interface on high voltage LCO cathode via PALD is conducive to cycling performance of solid polymer electrolyte.
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