Li∕Polymer Electrolyte∕Water Stable Lithium-Conducting Glass Ceramics Composite for Lithium–Air Secondary Batteries with an Aqueous Electrolyte

By Tao Zhang, N. Imanishi, S. Hasegawa, A. Hirano, Jian Xie, Y. Takeda, O. Yamamoto, N. Sammes. 2008

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A water-stable Li metal anode with water-stable lithium-conducting glass ceramics, Li 1+x+y Ti 2-x Al x Si y P 3-y O 12 (LTAP), and a lithium-conducting polymer electrolyte, PEO 18 Li(CF 4 SO 2 ) 2 N (PEO 18 LiTFSI), was proposed as the lithium anode for lithium-air batteries with an aqueous solution at the air electrode. LTAP was unstable when in direct contact with Li metal, and the cell resistance of Li/LTAP/Li rapidly increased as a function of the contact time. The Li/PEO 18 LiTFSI/LTAP/PEO 18 LiTFSI/Li symmetrical cell showed no change in the total resistance (around 800 Ω cm 2 at 60°C) over a period of 1 month. The PEO 18 LiTFSI membrane served as a protective interlayer to suppress the reaction between the water-stable glass ceramics LTAP and Li metal effectively. The Li/PEO 18 LiTFSI/LTAP/aqueous LiCl/Pt air cell showed a stable open-circuit voltage of 3.70 V at 60°C for 2 months. The open-circuit voltage was comparable with that calculated from the cell reaction of 2Li + 1/2O 2 + H 2 O = 2LiOH. The cell exhibited a favorable discharge and charge performance at 0.25 mA cm -2 and 60°C.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/957950058d37d6b087abfa364d9f9bc053449e3f

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