材料科学
电化学
电解质
化学工程
复合材料
电导率
聚合物
电极
离子电导率
化学
工程类
物理化学
作者
Xiaona Pan,Peixia Yang,Yue Guo,Kejie Zhao,Baojuan Xi,Feng Lin,Shenglin Xiong
标识
DOI:10.1002/admi.202100669
摘要
Abstract Ionically conductive polymers are a promising family of electrolytes for electrochemical devices, including batteries, and flexible electronics. The polymer electrolytes with an excellent mechanical property probably can inhibit the dendrites growth during charging/discharging. Herein, the mechanical properties of an N −methyl− N −propyl piperidinium bis(trifluoromethanesulfonyl)imide/poly(vinylidene fluoride‐hexafluoropropylene) gel polymer electrolyte is improved through compositing with %TiO 2 nanoparticles. The gel polymer electrolyte shows increased loss modulus after compositing with 5 wt% TiO 2 , indicating that the inorganic nanoparticles can increase the viscous response of polymer electrolytes. The Li‐ion conductivity shows a noticeable dependence on %TiO 2 and the highest ionic conductivity is obtained at 5 wt% TiO 2 . The presence of TiO 2 in the gel polymer electrolyte also allows for smaller interfacial resistance and a more stable Li−electrolyte interface upon long‐term storage and battery cycling. As a result, when assembled with the LiFePO 4 and LiNi 0.6 Mn 0.2 Co 0.2 O 2 cathodes, the composite gel polymer electrolyte improves the full‐cell performance, such as higher Coulombic efficiency, improved cycling stability, and more stable electrode–electrolyte interface.
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