多硫化物
环氧乙烷
复合数
无机化学
电解质
离子电导率
分离器(采油)
氢化物
材料科学
丙烯腈
氧化物
锂硫电池
化学
阳极
化学工程
金属
聚合物
冶金
复合材料
物理化学
工程类
物理
热力学
电极
共聚物
作者
Xiang Zhang,Tengfei Zhang,Yifei Shao,Hailin Cao,Zhenhua Liu,Shuai Wang,Xiaogang Zhang
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2021-04-07
卷期号:9 (15): 5396-5404
被引量:38
标识
DOI:10.1021/acssuschemeng.1c00381
摘要
Complex hydride LiBH4 is a promising solid-state electrolyte (SSE) for rechargeable batteries, owing to its great compatibility with the lithium metal anode and good mechanical properties. However, LiBH4 only exhibits high ionic conductivity (10–3 S cm–1) with the hexagonal structure at temperatures above 117 °C. To overcome this obstacle, composite poly(ethylene oxide)–hydride electrolytes were synthesized by a solution-casting method. PEO–Li4(BH4)3I (EO/Li+ = 10) delivers the highest ionic conductivity of 4.09 × 10–4 S cm–1 with high Li+ transference number of 0.45 at 70 °C. The addition of nano-SiO2 as an inorganic filler enhances the dendrite-free ability of electrolyte membranes dramatically and prolongs the cycle life of the Li symmetric battery from <100–360 h. In order to suppress the shuttling effect of polysulfide and volume expansion in lithium–sulfur (Li–S) batteries, sulfurized pyrolyzed poly(acrylonitrile) was selected as the cathode material for all-solid-state batteries, which presented a remarkable cycling stability of 232 (967 for sulfur content) mA h g–1 after 75 cycles. These attempts not only decrease the application temperature of LiBH4 but also broaden the utilization of hydride in SSEs.
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