摘要
通过镁热还原SiO_(2)实现了纳米硅的制备,随后通过液相置换法将其与葡萄糖复合经过热处理获得硅/碳复合材料(Si/C)。在将制备的材料作为锂离子电池的负极材料,测试发现该材料展示了优异的循环性能(在100 mA/g的电流密度下,循环50次的比容量能维持在800 mAh/g左右)、高的倍率性能(在4200 mA/g的电流密度下保持在385 mAh/g的比容量)和不错的循环稳定性(在840 mA/g的电流密度下,循环120次其容量亦能维持在约459 mAh/g),远高于纯硅和纯碳的容量。可见碳的介入有效改善了硅的导电性,提升了其储锂性能,为Si/C复合材料在高性能锂离子电池的应用提供了一种新的策略。
Novel liquid phase displacement method was developed to prepare a silicon/carbon composite(Si/C)by directly reacting nano silicon(which was synthesized by magnesium thermal reduction of SiO_(2))and glucose.Subsequently,When the Si/C is used as the anode material for LIBs,the batteries display favorable discharge capacities(800 mAh/g after 50 cycles at 100 mA/g),high-rate performance(385 mAh/g at 4200 mA/g),and excellent stable cyclability(459 mAh/g after 120 cycles at 840 mAh/g).Which is much higher than the discharge capacity of pure silicon and carbon.Such results indicate that the intervention of carbon effectively conductivity improves of Si for the lithium storage performance increasing.Notably,the research might provide a new strategy for the application of Si/C composite materials in high-performance LIBs.
作者
陈雨鑫
周国永
王繁
符远翔
CHEN Yuxin;ZHOU Guoyong;WANG Fan;FU Yuanxiang(School of Chemical Engineering,Guizhou Minzu University,Guiyang 550025,China;School of Chemical Engineering/Key Laboratory of Energy Chemistry in Guizhou Universities,Guizhou Institute of Technology,Guiyang 550003,China)
出处
《华南师范大学学报（自然科学版）》
CAS
北大核心
2024年第3期9-14,共6页
Journal of South China Normal University(Natural Science Edition)
基金
贵州省自然科学基金项目(黔科合基础-ZK[2022]一般171&ZK[2022]一般216)
贵州理工学院高层次人才启动项目(2023GCC021)。
关键词
液相置换法
Si/碳材料
储锂性能
锂离子电池
liquid phase displacement method
Si/C composite
lithium storage performance
lithium-ion battery
