g-C_(3)N_(4)复合Ge锂离子电池负极材料的制备及其性能  

Preparation and properties of g-C_(3)N_(4) composite Ge cathode material for lithium ion battery

作　　者：殷立雄[1] 李书航 宋佳琪 黄剑锋[1] 赵津 白培杰[1] YIN Li-xiong;LI Shu-hang;SONG Jia-qi;HUANG Jian-feng;ZHAO Jin;BAI Pei-jie(School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi′an 710021, China)

机构地区：[1]陕西科技大学材料科学与工程学院陕西省无机材料绿色制备与功能化重点实验室,陕西西安710021

出　　处：《陕西科技大学学报》2022年第2期109-113,137,共6页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51772178);陕西省科技厅重点研发计划项目(2020GY-257);陕西省创新能力支撑计划项目(2021TD-16);陕西省西安市科技计划项目(2019216514GXRC001CG002-GXYD1.8)。

摘　　要：锗由于有较高的质量容量(1600 mAh/g)、良好的电子传导率和锂离子扩散性等优点,在电极材料领域广受关注.然而锗基材料充电时巨大的体积膨胀极其影响电池寿命.以三聚氰胺为碳源,利用简单工艺制备出氮化碳(g-C_(3)N_(4))复合锗(Ge)材料(Ge/CN).研究了不同水热温度对Ge/CN复合电极形貌及储锂性能的影响.通过SEM和电化学性能测试发现,当水热温度为180℃时,Ge/CN-2电极形貌为孔隙丰富的层级结构且储锂性能最好.于0.1 A/g的电流密度下第一圈放电比容量高达1275.7 mAh/g,经100圈循环后容量仍有684.2 mAh/g,电化学性能良好.Germanium(Ge)has attracted much attention in the field of electrode materials because of its high mass capacity(1600 mAh/g),good electron conductivity and lithium ion diffusion.However,the huge volume expansion of germanium based materials during charging greatly affects the battery life.Carbon nitride(g-C_(3)N_(4))composite germanium(Ge)material(Ge/CN)was prepared by simple process with melamine as carbon source.The effects of different hydrothermal temperatures on the morphology and lithium storage properties of Ge/CN composite electrode were studied.SEM and electrochemical performance tests show that when the hydrothermal temperature is 180℃,the morphology of Ge/CN-2 electrode is a hierarchical structure with rich pores,and the lithium storage performance is the best.The first discharge specific capacity is 1275.7 mAh/g when current density is 0.1 A/g.The specific capacity can stay at 684.2 mAh/g after 100 cycles,showing good electrochemical performance.

关 键 词：锗 锂离子电池 复合材料 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]