Tin-based organic sulfides with highly reversibility of conversion reaction synthesized at room temperature as anode for lithium storage

Increasing the degree of dispersion is of great significance for improving the electrochemical performance of tin-based materials. The smaller size is conducive to alleviating the volume effect and improving the reversibility of the conversion reaction, thus improving the cyclic stability and reversible capacity of tin-based anode materials. In this work, tin-based organic sulfide is synthesized by potassium ethyl xanthate, and graphene is added to enhance the conductivity of the electrode material. The anode material exhibits excellent performance with the residual capacity of 657 mAh g(-1) after 400 cycles at the current density of 200 mA g(-1). The differential charge capacity (dQ/dV) curves show that the conversion reaction of electrode materials has good reversibility and is maintained until the end of the cycle. We also investigated the effect of calcination temperature on the conversion reaction, and verified that it is important to maintain the tin-organic structure for the reversibility of the conversion reaction. (C) 2020 Elsevier Ltd. All rights reserved.