Wei Zhixuan, Gao Yu, Wang Lei, Zhang Chaoyang, Bian Xiaofei, Fu Qiang, Wang Chunzhong, Wei Yingjin, Du Fei, Chen Gang
Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun, 130012, P.R. China.
Contemporary Amperex Technology Co., Limited, Fujian Province, 352100, P.R. China.
Chemistry. 2016 Aug 8;22(33):11610-6. doi: 10.1002/chem.201600757. Epub 2016 Jun 20.
Li-rich layered oxide Li1.18 Ni0.15 Co0.15 Mn0.52 O2 (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.
富锂层状氧化物Li1.18Ni0.15Co0.15Mn0.52O2（LNCM）首次被用作混合钠离子电池的正极，并通过恒电流充放电曲线、循环伏安法和倍率性能对其Na(+)存储特性进行了全面研究。所提出的钠离子电池中的LNCM表现出良好的倍率性能，在10C倍率下放电容量达到约90 mA h g(-1)，并且具有出色的循环稳定性，在5C倍率下200次循环的比容量约为105 mA h g(-1)。此外，非原位ICP-OES表明存在有趣的混合离子迁移过程：在最初的两个循环中，只有Li(+)能够嵌入LNCM阴极，而随着电化学循环的增加，Li(+)和Na(+)共同起作用。同时，通过各种充放电扫描结束时的非原位XRD图谱研究了LNCM的结构演变。从这项研究中获得的深刻见解可能有助于未来可充电钠离子电池新型层状阴极材料的设计。
