The Research Of High Specific Capacity Tin-based Anode Materials For Lithium-ion Battery

Tin-based anode materials have attracted great attention as high specific capacity anode materials for lithium-ion battery. For tin-based anode material, large volumetric change during during the charge-discharge process severely damaged its structural and electrochemical properties, resulting in a rapid capacity fading. At present, defects of tin-based material still restricted its rapid development, although a growing number of researchers involved in the study of tin-based anode material in the past.The first thing to improve the cycling performance of the material is to suppress the volume change since we have known the reason. Based on this, we modified the material by coating the surface of stannate.1. We used glucose as carbon source to prepare carbon coated Mn-Sn metal oxide composite (MTO@C) by hydrothermal reaction and subsequent carbonization. We found that the MTO’s cycle performance was improved significantly after coated the carbon layer, and the capacity remained at409mAh/g after200cycles. Therefore, the carbon layer formed on the MTO can improve its cycling performance.2. We synthesized CoSnO3@N-C by a simple hydrothermal reaction of carboxylated chitosan and subsequent carbonization approach. Compared to the pure CoSnO3material, the CoSnO3@N-C composite exhibits a high lithium storage properties and excellent cycle characteristics. The reversible capacity still maintains650mAh/g even after50cycles. The CoSnO3@N-C composite also shows a good rate performance, The excellent cycling ability and rate performance of the CoSnO3@N-C composite could be attributed to the small particles size of CoSnO3and the nitrogen-doped carbon coating.