氮掺杂多孔炭负载Cu_(2)S复合材料的制备及其储锂性能研究  

Preparation and lithium storage performance of nitrogendoped porous carbon supported Cu_(2)S composite

作　　者：郭正好 周鹏[1] 徐平[1] 何立榕 黄启忠[1] 张明瑜[1] 吴飞翔[2] Guo Zheng-hao;Zhou Peng;Xu Ping;He Li-rong;Huang Qi-zhong;Zhang Ming-yu;Wu Fei-xiang(National Key Laboratory of Science and Technology on High-strength Structural Materials,Central South University,Hunan Changsha 410083,China;Engineering Research Center of the Ministry of Education for Advanced Battery Materials,Central South University,Hunan Changsha 410083,China)

机构地区：[1]中南大学轻质高强结构材料国家重点实验室,湖南长沙410083 [2]中南大学先进电池材料教育部工程研究中心,湖南长沙410083

出　　处：《炭素技术》2021年第4期31-35,共5页Carbon Techniques

基　　金：国家自然科学基金(U19A2088,51904344)。

摘　　要：过渡金属硫化物因价格低、比容量高而被认为是一种潜在的锂离子电池负极材料,但不理想的电导率和巨大的体积膨胀阻碍了其实际应用。利用溶胶-凝胶热解吹制法成功地在氮掺杂多孔炭中嵌入Cu_(2)S纳米粒子(Cu_(2)S@NC)。Cu_(2)S@NC作为负极具有良好的循环稳定性和高可逆比容量。氮掺杂多孔炭骨架作为导电桥确保了良好的电子导电性,薄壁结构缩短了锂离子扩散路径,增加了电极离子导电性。测试结果表明,1 A/g循环500次后比容量为407.6 mAh/g,0.1 A/g循环100次后比容量为623.3 mAh/g。该合成路线有望为开发低成本、高性能的转化型金属硫化物负极材料提供一种新的解决方案。Transition metal sulfide is a potential anode material for lithium-ion batteries due to its low price and high specific capacity, but its undesirable conductivity and huge volume expansion hinder its practical application. A new anode material of embedded Cu_(2)S nanoparticles in nitrogen-doped porous carbon(Cu_(2)S@NC) is successfully synthesized by sol-gel pyrolysis blowing method.The Cu_(2)S@NC as anode shows an excellent cycling stability and high reversible specific capacity. Nitrogen-doped porous carbon skeleton ensures the anode good electron conductivity as a conductive bridge. Meanwhile, thin-walled structure shortens the path of lithium-ion diffusion and increases the ionic conductivity. The test results show that specific capacities achieve 407.6 mAh/g after500 cycles at 1 A/g and 623.3 mAh/g at 0.1 A/g after 100 cycles. The proposed synthesis route is to afford a new way for the exploitation of low-cost and high-performance conversion-type metal sulfide anode materials.

关 键 词：多孔炭 金属硫化物 锂离子电池 负极材料 

分 类 号：TQ424[化学工程] TB332[一般工业技术—材料科学与工程]