材料科学
电解质
锂(药物)
化学工程
电池(电)
氧化物
电化学
复合数
离子电导率
无机化学
复合材料
电极
冶金
化学
物理
工程类
内分泌学
物理化学
功率(物理)
医学
量子力学
作者
Samson Ho‐Sum Cheng,Chen Liu,Fangyan Zhu,Liang Zhao,Rong Fan,C.Y. Chung,Jiaoning Tang,Xierong Zeng,Yan‐Bing He
出处
期刊:Nano Energy
[Elsevier]
日期:2021-02-01
卷期号:80: 105562-105562
被引量:71
标识
DOI:10.1016/j.nanoen.2020.105562
摘要
Searching novel polyethylene oxide (PEO) based composite electrolyte that can be compatible with high voltage cathodes (> 4 V) at room temperature is a long-standing challenge, but essential to achieve high-energy-density for solid-state lithium (Li) metal batteries. Herein, we develop an advanced dual-salts reinforced PEO/garnet solid-state composite electrolyte (SCE) with high ionic conductivity of 9 × 10−4 S cm−1 and an electrochemical stability window up to ~ 4.7 V, where the lithium bis(oxalate)borate (LiBOB) is used as additive with LiClO4. The dual-salts reinforced SCE can achieve excellent room temperature cycling performance of LiNi0.8Co0.1Mn0.1O2 (NCM811)/Li metal batteries. The multiplied polymer-ion interactions and formation of Li‒B‒O/C‒O species originated from the (oxalato)borate group of LiBOB effectively promotes the electrochemical stability of the PEO based composite electrolyte and its wetting properties with electrodes. Unwanted non-conductive decomposition products, such as Li2O and Li2CO3, and NCM particles cracking during cycling are successfully suppressed. The NCM811 solid-state cells using the optimized dual-salts composite electrolyte delivers high specific capacity of 190 mA h g−1 and exhibit stable cycling performance for more than 200 cycles at 25 °C.
科研通智能强力驱动
Strongly Powered by AbleSci AI