Synthesis and electrochemical study of Zr-doped Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ as cathode material for Li-ion battery

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• 作者：Hao Chen ; Qiyang Hu ; ^{Qiyanghucsu@163.com" class="auth_mail" title="E-mail the corresponding author} ; Zimo Huang ; Zhenjiang He ; Zhixing Wang ; Huajun Guo ; Xinhai Li
• 关键词：Lithium ion battery ; Cathode material ; Zr-doping
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：263-269
• 全文大小：2836 K

文摘

Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ materials doped with different Zr contents are studied using X-ray diffractometry (XRD), energy dispersive X-ray analysis (EDX), scanning electron microscopy (SEM), charge–discharge measurements, AC impedance spectroscopy as well as cyclic voltammetry. These results demonstrate that the element Zr is distributed uniformly in these materials. With the increase of Zr content, the lattice parameters a, c and lattice volume V become larger. The discharge cycling curves of cells show that Zr doping enhances cycle life compared with the undoped one. The sample with x=0.01 shows the highest capacity and best cycling performance, especially at high current density. The Li[Li_0.2Mn_0.54−x/3Ni_0.13−x/3Co_0.13−x/3Zr_x]O₂ (x=0.01) delivers a capacity of 133.6 mA h g⁻¹ (after 100 cycles) at the current density of 250 mA g⁻¹, corresponding to the capacity retention of 83.8%. The favorable performance of the doped samples could be attributed to its enhanced structural stability and Li⁺ mobility.