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Sandwich-Like Poly(propylene carbonate)-Based Electrolyte for Ambient-Temperature Solid-State Lithium Ion Batteries

Yue, Hongyun, Li, Jingxian, Wang, Qiuxian, Li, Chengbin, Zhang, Jian, Li, Qianhui, Li, Xiangnan, Zhang, Huishuang, Yang, Shuting
ACS sustainable chemistry & engineering 2018 v.6 no.1 pp. 268-274
ambient temperature, anodes, electrochemistry, electrolytes, lithium, lithium batteries, polypropylenes, propylene
A poly(propylene carbonate) (PPC)-based sandwich-like composite solid polymer electrolyte (SE) was designed and applied to solid-state lithium ion batteries at 25 °C. The sandwich-like structure of the composite SE was composed of three parts. A polypropylene separator was used as a support membrane to enhance the strength of the SE membrane. Succinonitrile in the PPC-based SE was used to increase the ionic conductivity. Pure PPC as a buffer layer was closed to the lithium anode, which could improve the interface compatibility, Coulombic efficiency, and cycle life of batteries. The sandwich-like composite SE exhibited good comprehensive properties such as a high ion transference number (0.65), sufficient ionic conductivity (2.18 × 10–⁴ S cm–¹ and 5.77 × 10–⁴ S cm–¹ at 25 and 55 °C, respectively), and outstanding electrochemical stability at ambient temperature. Furthermore, a Li/LiFePO₄ cell with the sandwich-like composite SE delivered a discharge capacity close to 140 mA h g–¹ (0.1 C) at 25 °C. The results suggested that a sandwich-like PPC-based electrolyte is a promising SE for solid-state batteries.