An all-solid-state Li-organic battery with quinone-based polymer cathode and composite polymer electrolyte

Wenfei Wei, Long Li, Lei Zhang, Jianhe Hong, Gang He

Index: 10.1016/j.elecom.2018.03.006

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Abstract

Despite having promising Li storage properties such as multielectron reactions and fast kinetics, organic electrode materials exhibit poor cycling stability, which is partly caused by their tendency to dissolve in liquid electrolytes. In this work, an all-solid-state Li-organic battery with excellent cycling stability and high discharge voltage was designed, in which poly(2-chloro-3,5,6-trisulfide-1,4-benzoquinone) (PCTB) and poly(ethylene glycol) (PEO)-based composite polymer electrolyte (CPE) served as the cathode and electrolyte respectively. The PEO-LiClO4-10 wt% Li0.3La0.566TiO3 (LLTO) electrolyte has an excellent ionic conductivity of 7.99 × 10−4 S cm−1 at 343 K. Furthermore, the all-solid-state battery exhibited a high discharge capacity of 104 mAh g−1 with an average potential of 2.72 V at 343 K. After 300 cycles, 90% of the maximum capacity was retained. These results shed light on the application of carbonyl compounds in conjunction with PEO-based electrolytes for Li-ion batteries.