富钴多孔碳制备高性能氧化锡阳极

Preparation of High Performance Tin Oxide Anode with Cobalt-Rich Porous Carbon

通过一步碳化法制备富含氧化钴(CoO)的多孔碳(PC(Co))材料作为氧化锡(SnO2)的载体。PC(Co)材料具有丰富的多孔结构,能够高效承载SnO2。不仅如此,PC(Co)材料中的氧化钴能够作用于电化学反应,有效降低LiO2的生成。但CoO参与反应会消耗大量的锂离子,所以选择添加氟化锂(LiF),在补锂的同时能够增强SEI膜的稳定性。SnO2-PC(Co)/LiF电极活性物质的负载量高达1.51 mg·cm-2。电化学测试表明,在电流密度为100 mAh·g-1时,SnO2-PC(Co)/LiF电极首次放电比容量达到1653.63mAh·g-1,活性物质的利用率高达93.14%。循环100次后,放电比容量仍然达到1070.68 mAh·g-1,且库仑效率仍然保持在99.81%。

One-step carbonization method was used to prepare CoO rich porous carbon(PC(Co))materials as carrier of tin oxide(SnO2).PC(Co)materials have rich porous structure which can efficiently carry SnO2.Furthermore,the CoO in the PC(Co)materials can act on the electrochemical reaction,effectively reducing the formation of LiO2.Bu cobalt oxide can consume a lot of lithium ions,so we chose to add lithium fluoride(LiF)which can while replenish-ing lithium and enhance the stability of the SEI film.By calculation,the loading of the active substance was as high as 1.51 mg·cm-2.Electrochemical tests show that at a current density of 100 mAh·g-1,the first discharge specific ca-pacity reached 1653.63 mAh·g-1,and the utilization rate of the active material was as high as 93.14%.After 100 cy-cles,the specific discharge capacity still reached 1070.68 mAh·g-1,and the coulombic efficiency remained at 99.81%.