摘要
为了提高纯锡(Sn)作为锂离子电池(LIB)负极材料时的循环性能,循环稳定性更好的锡基合金被广泛研究。本试验中,在铜箔上通过脉冲沉积制备了一种锡基负极(Sn+Co),其中Co主要作用是在Sn表面形成致密保护层。该致密的电惰性层不仅可以缓冲Sn的体积变化,还避免了充放电过程中Sn与电解质的反应,提高了固体电解质界面(SEI)的稳定性。材料的结构表征主要通过XRD、SEM和EDX来研究。试验结果表明,Sn+Co负极比Sn-Co合金负极具有更大比容量和更优异的循环性能。Sn+Co电极在0.1C电流密度下的首次放充电比容量分别为541.66mAh/g和483.97mAh/g。且Sn+Co电极在0.1C的电流密度下循环120次后容量保持率高达81.43%,远高于Sn-Co合金电极60.48%的保持率。
To improve the cycleability of pure tin(Sn)as anode material of lithium-ion battery(LIB),the Sn-based alloys with better cycling stability have been widely investigated.In this work, a tin based anode(Sn+Co)was prepared by a dense protective cobalt layer on the tin surface through a pulse deposition on copper foil.The dense electrically inert layer can buffer the volume change of tin and avoid the tin and electrolyte reactions during the charge-discharge processes, improve the stability of the solid electrolyte interphase(SEI).The structure of the material is investigated by XRD,SEM and EDX.The results that Sn+Co anode possessed a large specific capacity and a superior cycleability than that of the Sn-Co alloy electrode.The first charge-discharge specific capacities of Sn+Co electrode at 0.1 C are 541.66 mAh/g and 483.97 mAh/g respectively.And its capacity retention is 81.43% after 120 cycles at 0.1 C,which is higher than of Sn-Co alloy electrode 60.48%.
作者
肖开元
XIAO Kai-yuan(Hunan Metallurgy Material Institute Co.,Ltd.,Changsha 410129,China)
出处
《湖南有色金属》
2022年第3期47-51,共5页
Hunan Nonferrous Metals
