溶剂热制备CuSe纳米片及其储钠性能研究  

Solvothermal synthesis of CuSe nanoplates for sodium storage

作　　者：李云杰 马光耀 宋金梅 杨剑[1,2] 钱逸泰 Yunjie Li;Guangyao Ma;Jinmei Song;Jian Yang;Yitai Qian(School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China;Shenzhen Research Institute of Shandong University,Shenzhen 518057,China;School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]山东大学化学与化工学院,济南250100 [2]山东大学深圳研究院,深圳518057 [3]中国科学技术大学化学与材料科学学院,合肥230026

出　　处：《中国科学：化学》2021年第6期782-790,共9页SCIENTIA SINICA Chimica

摘　　要：由于资源储量丰富,钠离子电池已经成为下一代储能电池的有力候选方案之一.过渡金属硒化物由于具有易于制备、导电性能较好等优点而引起广泛关注.本文使用溶剂热方法成功地制备出六方相CuSe纳米片,并将其作为钠离子电池负极材料,结合多种测试及表征手段对其储钠性能与电化学反应机理进行了研究.电化学测试表明CuSe具有优异的电化学性能.在5 A g^(-1)电流密度下的可逆容量为183.5 mAh g^(-1),容量保持率为70.7%(相对0.1 A g^(-1)电流密度下的可逆容量而言).在2 A g^(-1)循环800圈后,容量保持率高达97.4%.非原位X射线粉末衍射和选区电子衍射测试结果表明,CuSe在储钠过程中会发生不可逆的转化反应生成Cu_(2-x)Se,后续的循环实际上是Cu_(2-x)Se进行钠离子的转化反应.Sodium-ion batteries have emerged as a promising candidate for energy storage devices,due to abundant reserves.Transitional metal selenides have attracted wide attention due to their easy preparation and good electric conductivity.Here,a simple and facile solvothermal method was used to prepare hexagonal CuSe nanoplates without using expensive reagents and complicated processes.The electrochemical performances and underlying reactions of CuSe nanoplates as the anode material for sodium-ion batteries were investigated in detail.CuSe nanoplates are capable of fast Na storage.They deliver a reversible capacity of 183.5 m Ah g^(-1)at a current density of 5 A g^(-1)and the capacity retention is~97.4%after 800 cycles at 2 A g^(-1).Ex-situ X-ray diffraction(XRD)and selected area electron diffraction(SAED)show that CuSe underwent a conversion reaction,leading to Cu_(2-x)Se in the first-charging process that then worked as the active material in the following cycles.

关 键 词：CuSe纳米片 溶剂热反应 钠离子电池 负极材料 电化学反应机理 

分 类 号：TQ131.21[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]