Four volts class solid lithium polymer batteries with a composite polymer electrolyte

Abstract

Polyethylene oxide (PEO)-based polymer electrolytes with BaTiO 3 as a filler have been examined as electrolytes in 4 V class lithium polymer secondary batteries. A mixture of 90 wt.% LiN(CF 3SO 2) 2–10 wt.% LiPF 6 was found to be the best candidate as the salt in PEO, and showed high electrical conductivity, good corrosion resistance to the aluminum current collector and low interfacial resistance between the lithium metal anode and the polymer electrolyte. The cyclic performance of the cell, Li/[PEO 10–(LiN(CF 3SO 2) 2–10 wt.% LiPF 6)]–10 wt.% BaTiO 3/LiNi 0.8Co 0.2O 2/Al, showed good charge–discharge cycling performance. The observed capacity fading on charging up to 4.2 V at 80 °C in the cell was about 0.28% per cycle in the first 30 cycles, compared to that of 0.5% for the polymer electrolyte without LiPF 6 in the lithium salt.