Na-doped Ni-rich LiNi0.5Co0.2Mn0.3O2 cathode material with both high rate capability and high tap density for lithium ion batteries

Weibo Hua; Jibin Zhang; Zhuo Zheng; Wenyuan Liu; Xihao Peng; Xiao-Dong Guo; Benhe Zhong; Yan-Jie Wang; Xinlong Wang

doi:10.1039/c4dt01611d

Na-doped Ni-rich LiNi0.5Co0.2Mn0.3O2 cathode material with both high rate capability and high tap density for lithium ion batteries

Dalton Trans. 2014 Oct 21;43(39):14824-32. doi: 10.1039/c4dt01611d.

Authors

Weibo Hua¹, Jibin Zhang, Zhuo Zheng, Wenyuan Liu, Xihao Peng, Xiao-Dong Guo, Benhe Zhong, Yan-Jie Wang, Xinlong Wang

Affiliation

¹ College of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu, 610065, China. xiaodong2009@scu.edu.cn wangxl@scu.edu.cn.

PMID: 25162932
DOI: 10.1039/c4dt01611d

Abstract

Na-doped Ni-rich LiNi0.5Co0.2Mn0.3O2 cathode material, Li0.97Na0.03Ni0.5Co0.2Mn0.3O2, is synthesized by a hydroxide co-precipitation route. The structural characterization reveals that the substitution of Na for Li results in a more ordered α-NaFeO2 structure, enlarges Li layer spacing, and reduces the degree of cation mixing. The Li0.97Na0.03Ni0.5Co0.2Mn0.3O2 material has a high tap density of 2.17 g cm(-3) that meets the commercial requirement in lithium ion batteries (LIBs). The galvanostatic charge/discharge results show that the electrochemical performance of the Li0.97Na0.03Ni0.5Co0.2Mn0.3O2 is significantly improved. At 0.2, 1, 10, 30 and 50 C, the specific capacities of the Li0.97Na0.03Ni0.5Co0.2Mn0.3O2 are 228.43, 163.12, 121.43, 95.56 and 60.09 mA h g(-1), respectively, which are superior to those of the undoped LiNi0.5Co0.2Mn0.3O2 due to the enlargement of Li layer spacing, the decreased degree of cation mixing, and the rapid diffusion of Li-ion in the bulk lattice after the substitution of Na for Li. Therefore, the Na-doped Ni-rich LiNi0.5Co0.2Mn0.3O2 material is a promising cathode candidate for the next generation of LIBs.