Development of a lithium-oxygen battery with an improved redox mediator applicable to gel polymer electrolytes

초록

Lithium-oxygen batteries (LOBs) are next-generation electrochemical power sources with significantlyhigh capacities and energy densities. In particular, Li2O2 produced during charging exhibits a low electri cal conductivity and insolubility, which leads to low energy efficiency in LOBs. Thus, various catalysts arestudied to solve essential problems such as the sluggish decomposition rate of Li2O2. In this study, a redoxpolymeric catalyst (RPC-FePc) is fabricated on an air electrode by combining iron(Ⅱ) phthalocyanine(FePc) as the redox mediator and polyvinylidene fluoride as the binder. The RPC-FePc applied to liquidelectrolyte- and gel polymer electrolyte-based LOBs exhibit improved electrochemical properties, thatis, increased cycling efficiencies and a reduced IR drop, compared to an RPC-free LOB

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