Role of a Topotactic Electrochemical Reaction in a Perovskite-Type Anode for Lithium-Ion Batteries

Perovskite-type CaMnO3 anode material for highly efficient and stable lithium ion storage

Lithium ion batteries are attracting ever increasing attention due to their advantages of high energy/ power density, environmental friendly, lifetime and low cost. As a star in the field of materials and energy, perovskites have received extensive attention due to their attracting physical and chemical properties. Herein, CaMnO₃, one material from the perovskite family is introduced as a novel anode material for lithium ion batteries, and its electrochemical performance at different temperatures is systematically investigated. CaMnO₃ has been synthesized using a liquid phase synthesis method followed by high temperature calcination. The as-obtained CaMnO₃ exhibits an initial high discharge capacity of 708.4 mAh g^-1, superior rate capability and stable cycling performance at room temperature, the specific capacity is 102.5 mAh g^-1 after 500 cycles at a current density of 0.1 A g^-1. Additionally, at an extreme temperature of 0 °C, the discapacity can reach 138.2 mAh g^-1 at a current density of 0.05 A g^-1. At high temperature of 50 °C, the reversible discharge capacity is up to 216.5 mAh g^-1under the same condition. It is believed that this contribution may lay the foundation for the application of perovskites in other rechargeable batteries and energy storage devices.