Manipulating the stress of Sn in carbon structure to realize long-life high performance sodium ion battery anode material

Abstract

Abstract Stress is an important characteristic that affects the properties of materials. However, few reports on how stress affects sodium storage behavior. In this article, we manipulate the stress of Sn in carbon structure to inhibit the volume expansion of Sn. As an anode for SIBs, carbon-coated Sn@SnO2/CC exhibits a capacity of around 400 mAh/g at 1 A/g after 800 cycles. After further research, it is found that the existence of compressive stress can significantly improve the charge and discharge stability of the material. Meanwhile, it can stabilize the structure and morphology of material and maintain the stable charge transfer process between Sn and carbon structure. These results reveal the effect of stress on the behavior of sodium storage. It provides reference to the practical application of other materials with alloy reaction mechanism as high performance sodium ion battery anode material.