Affiliation:
1. School of Chemistry Engineering Research Center of Energy Storage Materials and Chemistry for Universities of Shaanxi Province State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an Shaanxi 710049 China
2. Department of Environmental Science and Engineering Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China
Abstract
AbstractAs a potential alternative to liquid organic electrolytes, solid polymer electrolytes provide good processability and interfacial properties. However, insufficient ionic conductivity limits its further development. To overcome these challenges, we propose the solution of synthetic clay Laponite as a filler in this work. Specifically, the ionic conductivity increases to 1.71×10−4 S cm−1 (60 °C) after adding 5 wt.% of Laponite to the PEO−LiClO4 system. The Laponite surface‘s negative charge enhances lithium ions dissociation and transport in the electrolyte: the lithium‐ion transference number increases from 0.17 to 0.34, and the exchange current density increases from 46.84 μA cm−2 to 83.68 μA cm−2. The improved electrochemical properties of composite electrolytes improve the symmetric cell‘s stability to at least 600 h. Meanwhile, the Li||LiFePO4 cells′ rate and long‐cycle performance are also significantly enhanced. This work‘s concept of Laponite filler demonstrates a novel strategy to enhance ion transport in polymer‐based electrolytes for solid‐state batteries.
Funder
National Natural Science Foundation of China