期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 41, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202103049
关键词
lithium salts; polymer; solid electrolytes; solid-state batteries; supramolecular design
类别
资金
- National Key R&D Program of China [2018YFB0104300]
- Beijing Municipal Natural Science Foundation [2202027]
- National Natural Science Foundation of China [51872026]
A novel polymer-in-salt solid electrolyte was developed through a supramolecular strategy, showing high ionic conductivity, wide electrochemical window, superior lithium-ion transference number, and good interface compatibility with electrodes. It provides a promising solution to high voltage compatibility and interfacial issues in solid-state batteries.
The stringent demands for lithium salts make the design of polymer-in-salt type solid electrolyte restricted since it was proposed in 1993. Herein, a novel polymer-in-salt solid electrolyte is developed via a supramolecular strategy based on poly(methyl vinyl ether-alt-maleic anhydride) (PME) and novel single-ion lithiated polyvinyl formal (LiPVFM)/lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) composite salts (Dual-Li). Hydroxyl of LiPVFM in Dual-Li forms a strong hydrogen bond with the carboxylic acid group generated by the partial ring-opening reaction of maleic anhydride in PME. Meanwhile, PME with abundant carbonyl enables the improved LiTFSI coordination in the polymer/salt composites. As a result, the greatly enhanced mutual solubility of PME and Dual-Li is of importance to build a polymer-in-salt solid electrolyte (PISE), which exhibits high ionic conductivity of 3.57 x 10(-4) S cm(-1), wide electrochemical window beyond 5 V, and superior lithium-ion transference number of 0.62 at 25 degrees C as well as excellent interfacial compatibility with electrodes. The as-assembled LiCoO2||Li solid batteries present prominent high-voltage cyclability with 89.2% capacity retention in 225 cycles. Furthermore, LiNi0.7Mn0.2Co0.1O2||Li pouch cells exhibit remarkable safety even under harsh conditions. The study offers a promising strategy to address the high voltage compatibility and interfacial issues using PISE in solid-state batteries.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据