Flower-like SnS2 composite with 3D pyrolyzed bacterial cellulose as the anode for lithium-ion batteries with ultralong cycle life and superior rate capability

Abstract

The enormous volume expansion during cycling and poor electron conductivity of SnS₂ limit its cycling stability and high rate capability. Herein, flower-like SnS₂ anchored on 3D carbon nanofiber structures were designed and synthesized by a simple hydrothermal method. Pyrolyzed bacterial cellulose as 3D carbon nanofibers can not only offer a continuous pathway of Li⁺ and electrons, but can also migrate the serious volume change of SnS₂ during charging and discharging. The obtained composite shows a specific capacity of 408.8 mA h g⁻¹ even after 1500 cycles at 10 A g⁻¹, and almost no specific capacity decay after 20 cycles with a retention of 97.5%.