Lithium-Rich Layered Oxide Li1.18Ni0.15Co0.15Mn0.52O2 as the Cathode Material for Hybrid Sodium-Ion Batteries

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• 作者：Zhixuan Wei ; Dr. Yu Gao ; Lei Wang ; Chaoyang Zhang ; Xiaofei Bian ; Qiang Fu ; Prof. Chunzhong Wang ; Prof. Yingjin Wei ; Dr. Fei Du and Prof. Gang Chen
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：August 8, 2016
• 年：2016
• 卷：22
• 期：33
• 页码：11610-11616
• 全文大小：2412K
• ISSN：1521-3765

文摘

Li-rich layered oxide Li_1.18Ni_0.15Co_0.15Mn_0.52O₂ (LNCM) is, for the first time, examined as the positive electrode for hybrid sodium-ion battery and its Na⁺ storage properties are comprehensively studied in terms of galvanostatic charge–discharge curves, cyclic voltammetry and rate capability. LNCM in the proposed sodium-ion battery demonstrates good rate capability whose discharge capacity reaches about 90 mA h g⁻¹ at 10 C rate and excellent cycle stability with specific capacity of about 105 mA h g⁻¹ for 200 cycles at 5 C rate. Moreover, ex situ ICP-OES suggests interesting mixed-ions migration processes: In the initial two cycles, only Li⁺ can intercalate into the LNCM cathode, whereas both Li⁺ and Na⁺ work together as the electrochemical cycles increase. Also the structural evolution of LNCM is examined in terms of ex situ XRD pattern at the end of various charge–discharge scans. The strong insight obtained from this study could be beneficial to the design of new layered cathode materials for future rechargeable sodium-ion batteries.