氮掺杂多孔炭负载Cu_(2)Se_(4)Sn/SnSe复合材料的制备及其储锂性能研究  

Preparationand lithium storage performance of nitrogen-doped porous carbon supported Cu_(2)Se_(4)Sn/SnSe composite

作　　者：邹壬灏 徐平[1] 戴开斌 邵俊杰 陆秀清 黄启忠[1] 苏哲安[1] Zou Ren-hao;Xu Ping;Dai Kai-bin;Shao Jun-jie;Lu Xiu-qing;Huang Qi-zhong;Su Zhe-an(National Key Laboratory of Science and Technology for National Defence on High-strength Structural 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防科技重点实验室,湖南长沙410083

出　　处：《炭素技术》2023年第2期37-42,55,共7页Carbon Techniques

摘　　要：金属硒化物由于比容量高,储量丰富而被认为是一种有潜力的新型锂离子电池负极材料,但其低电导率以及脱/嵌锂时巨大的体积膨胀限制了实际的应用。利用冷冻干燥法配合模板法成功制备了氮掺杂多孔炭负载Cu_(2)Se_(4)Sn/SnSe复合材料(Cu_(2)Se_(4)Sn/SnSe/N-PCs),对其进行电化学性能测试。结果显示,制备的Cu_(2)Se_(4)Sn/SnSe/N-PCs-2的首次库伦效率能接近90%;在0.5 A/g的电流密度下,200圈循环后仍保持931.7 mAh/g的可逆比容量。在3 A/g的电流密度下,能提供880.9 mAh/g的可逆比容量。由于氮掺杂炭骨架提供的高导电网络、稳定的结构以及Cu_(2)Se_(4)Sn与SnSe之间的协同效应,Cu_(2)Se_(4)Sn/SnSe/N-PCs作为负极材料时具有优异的电化学性能,具有广泛的应用前景。Metal selenide is considered as a potential new type of negative electrode material for lithium-ion batteries due to its high specific capacity and abundant reserves.However,its low conductivity and huge volume expansion during lithium extraction/intercalation process limit its practical application.The nitrogen-doped porous carbon supported Cu_(2)Se_(4)Sn/SnSe(Cu_(2)Se_(4)Sn/SnSe/NPCs)was successfully prepared by freeze-drying method and template method.Cu,Se,Sn/SnSe/N-PCs have excellent electrochemical performance when used as the negative electrode material.The results show that the first coulombic efficiency of the prepared Cu_(2)Se_(4)Sn/SnSe/N-PCs-2 can be close to 90%;at a current density of 0.5 A/g,it still maintains a reversible specific capacity of 931.7 mAh/g after 200 cycles.At a current density of 3 A/g,it can provide a reversible specific capacity of 880.9 mAh/g.Cu_(2)Se_(4) Sn/SnSe/N-PCs have excellent electrochemical performance as anode materials due to the highly conductive network,stable structure of nitrogen-doped carbon skeleton and synergistic effect between Cu_(2)Se_(4)Sn and SnSe,which is considered as a promising negative electrode material for lithium-ion batteries.

关 键 词：氮掺杂多孔炭 冷冻干燥法 模板法 复合材料 电化学性能 

分 类 号：TQ424.19[化学工程] TB332[一般工业技术—材料科学与工程] TM911.15[电气工程—电力电子与电力传动]