Yang Guanhua, Yan Zhixiong, Cui Lisan, Qu Yonghao, Li Qingyu, Li Xin, Wang Yiyan, Wang Hongqiang
School of Chemical and Pharmaceutical Sciences, Guangxi Normal University Guilin 541004 China.
Guangxi Key Laboratory of Low Carbon Energy Materials, Guangxi Normal University Guilin 541004 China.
RSC Adv. 2018 Apr 24;8(28):15427-15435. doi: 10.1039/c8ra01940a. eCollection 2018 Apr 23.
A Sn-Ni/graphite sheet composite is synthesized by a simple electroless plating method as an anode material for lithium ion batteries (LIBs). The microstructure and electrochemical properties of the composite are characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), and AC impedance spectroscopy. The results show that the as-prepared composite has Sn-Ni nanoparticles around 100 nm in size, where metallic Ni acts as an "anchor" to fix metallic Sn. The reunion phenomenon of Sn is alleviated by adding metallic Ni between the metallic Sn and graphite sheets. The Sn-Ni/graphite sheet electrode exhibits a good rate performance with a capability of 637.4, 586.3, 466.7, 371.5, 273.6, 165.3 and 97.3 mA h g at a current density of 0.1, 0.2, 0.5, 1.0, 2.0, 5.0 and 10 A g, respectively. The good electrical conductivity of Ni, high specific capacity of Sn and excellent cycling capability of the graphite sheets have a synergistic effect and are the main reasons behind the superior electrochemical performance. Furthermore, the as-prepared composite exhibits excellent lithium storage capacity and the reversible capacity increased as the cycle number increased.
通过一种简单的化学镀方法合成了一种Sn-Ni/石墨片复合材料，作为锂离子电池（LIBs）的负极材料。采用场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）、循环伏安法（CV）和交流阻抗谱对该复合材料的微观结构和电化学性能进行了表征。结果表明，所制备的复合材料具有尺寸约为100nm的Sn-Ni纳米颗粒，其中金属Ni起到“锚定”作用以固定金属Sn。通过在金属Sn和石墨片之间添加金属Ni，减轻了Sn的团聚现象。Sn-Ni/石墨片电极在电流密度分别为0.1、0.2、0.5、1.0、2.0、5.0和10A g时，表现出良好的倍率性能，其比容量分别为637.4、586.3、466.7、371.5、273.6、165.3和97.3 mA h g。Ni的良好导电性、Sn的高比容量以及石墨片的优异循环性能具有协同效应，是其卓越电化学性能的主要原因。此外，所制备的复合材料表现出优异的储锂容量，且可逆容量随着循环次数的增加而增加。
