Effect of lithium salt on electrochemical properties of LAGP-PEO solid composite electrolyte and solid state LiFePO4 lithium-ion battery#br#

doi:10.12028/2095-4239.2016.0029

Abstract

Abstract: LAGP-PEO(LiX) solid composite electrolyte were prepared with Li1.5Al0.5Ge1.5(PO4)3, LiX as conductive components and poly(ethylene oxide) as the binder using solution casting method. Effect of lithum salt, such as LiClO4, LiTFSI and LiBOB, on the ionic conductivity and electrochemical window of solid composite electrolyte were studied. At the same time, chemical and electrochemical cycling stability of interface between solid composite electrolyte and lithium were also studied. The results show that the decomposition voltage of LAGP-PEO(LiX) was higher than 5 V, the ionic conductivity of LAGP-PEO(LiTSFI) is the highest and it is stable at room temperature, but LAGP-PEO(LiBOB) is more stable at 60 ℃. In addition, the rate capability and the cycling performance of solid state LFP lithium ion battery with LAGP-PEO(LiX) were studied. The best properties was present at room temperature when LAGP-PEO(LiTSFI) composite electrolyte was used in battery, while LAGP-PEO(LiBOB) shows its best performances at 60 ℃.

Key words: composite electrolyte, LAGP, PEO, solid state LFP lithium-ion battery, LiClO4, LiTFSI, LiBOB

YU Tao1,2, HAN Yu1, GUO Qinpeng1, WANG Hui1, XIE Kai1. Effect of lithium salt on electrochemical properties of LAGP-PEO solid composite electrolyte and solid state LiFePO4 lithium-ion battery#br#[J]. Energy Storage Science and Technology, 2016, 5(5): 735-744.

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