CuS@Cu freestanding electrode via electrochemical corrosion for high performance Li-ion batteries

Abstract

3D porous CuS@Cu composite is prepared via a facile H2O2 aided electrochemical corrosion method, which shows prominent electrochemical performance as freestanding electrode for Li-ion batteries. It delivers no capacity fading at a specific current of 0.5Ag−1, showing discharge/charge of 845/834mAhg−1 after 500 cycles. After 50 cycles at various specific current from 0.1 to 1.5Ag−1, the CuS@Cu electrode can still exhibit no capacity fading over 300 cycles at 2Ag−1, delivering discharge capacity of 414mAhg−1.