Health & Environmental Research Online (HERO)


Print Feedback Export to File
8791046 
Journal Article 
Optimisation of conductivity of PEO/PVDF-based solid polymer electrolytes in all-solid-state Li-ion batteries 
Li, Jun; Zhu, K; Wang, J; Yan, K; Liu, J; Yao, Z; Xu, Y 
2020 
1 
Materials Technology
ISSN: 1066-7857 
WOS:000579043900001 
All-solid-state Li-ion batteries, have become increasingly important because of their highly reliable solid electrolyte materials. Flexible solid polyethylene oxide (PEO) based electrolytes have been widely studied. Nevertheless, this material exhibits low lithium-ion conductivity. Herein, we report the optimisation of the composition of PEO/polyvinylidene fluoride (PVDF)-based electrolytes to enhance ionic conductivity. When the weight ratio of lithium bis(trifluoromethane sulphonyl)imide and PEO/PVDF is 1:5 (LiTFSI:PEO/PVDF = 1:5), maximum conductivities are 2.98 x 10(-5)S cm(-1)at 30 degrees C and 5.56 x 10(-4)S cm(-1)at 60 degrees C. Furthermore, the all-solid-state battery using this solid electrolyte film, a Li metal anode, and a LiFePO(4)cathode delivers initial discharge capacities of 149.6 mAhg(-1)(0.1 C, 60 degrees C) and 130.2 mAh g(-1)(0.5 C, 60 degrees C). Meanwhile, the solid-state lithium battery also presents good cycling performance and excellent rate capability at 60 degrees C. 
All solid state; Li-ion battery; polymer electrolyte; polyethylene oxide; ionic conductivity