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Preparation and performance of poly(ethylene oxide)‐based composite solid electrolyte for all solid‐state lithium batteries
Author(s) -
Li Xiaolong,
Wang Xianyou,
Shao Dingsheng,
Liu Lei,
Yang Li
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.47498
Subject(s) - crystallinity , materials science , ethylene oxide , electrolyte , composite number , oxide , chemical engineering , lithium (medication) , electrochemistry , polymer , polarization (electrochemistry) , polypropylene , crystallization , thermal decomposition , polymer chemistry , composite material , chemistry , organic chemistry , copolymer , medicine , electrode , engineering , metallurgy , endocrinology
Poly(ethylene oxide)‐based solid electrolyte is attractive for using in all solid‐state lithium batteries. However, the polymer has a certain degree of crystallization, which is adverse to the conduction of lithium ions. In order to overcome this drawback, a flexible composite polymer electrolyte (CPE) containing TiO 2 nanoparticles is elaborately designed and synthesized by tape casting method. The effects of different molar ratios of EO: Li and mass fraction of TiO 2 on the physical and electrochemical performances are carefully studied. The results show the CPE10 having 10 wt % TiO 2 has the lowest degree of crystallinity of 9.04%, the lowest activation energy of 8.63 × 10 −5 eV mol −1 . Besides, the CPE10 shows a lower polarization and higher decomposition voltage. Thus, prepared all solid‐state battery LiFePO 4 /CPE10/Li shows a high initial capacity of 160 mAh g −1 at 0.1 C, 134 mAh g −1 at 0.5 C and higher capacity retention of 93.2% after 50 cycles at 0.5 C (1 C = 170 mAh g −1 ). © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47498.