title: Na-doped Ni-rich LiNi0.5Co0.2Mn0.3O2 cathode material with both high rate capability and high tap density for lithium ion batteries.
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.
authors.affiliation: College of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu, 610065, China. xiaodong2009@scu.edu.cn wangxl@scu.edu.cn.
authors.forename: Weibo
authors.initials: W
authors.lastname: Hua
authors.forename: Jibin
authors.initials: J
authors.lastname: Zhang
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Zheng
authors.forename: Wenyuan
authors.initials: W
authors.lastname: Liu
authors.forename: Xihao
authors.initials: X
authors.lastname: Peng
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Guo
authors.forename: Benhe
authors.initials: B
authors.lastname: Zhong
authors.forename: Yan-Jie
authors.initials: YJ
authors.lastname: Wang
authors.forename: Xinlong
authors.initials: X
authors.lastname: Wang