Magnesium and silicon co-doped LiNi0.5Mn1.5O4 cathode material with outstanding cycling stability for lithium-ion batteries. (October 2018)

• Record Type: Journal Article
• Authors: Shu, Xiaohui; Zhao, Hongyuan; Hu, Youzuo; Liu, Jintao; Tan, Ming; Liu, Shanahan; Zhang, Meiling; Ran, Qiwen; Li, Hao; Liu, Xingquan
• Is Part Of: Vacuum. Volume 156(2018)
• Page Start: 1
• Page End: 8
• Publication Date: 2018-10
• Subjects: Cathode material -- LiNi0.5Mn1.5O4 -- Magnesium and silicon co-doping -- Cycling stability; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2018.07.007
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: The magnesium (Mg) and silicon (Si) co-doped LiNi0.5 Mn1.5 O4 sample has been obtained by sol-gel method. The effects of co-doping with magnesium and silicon ions on the phase structure, morphology and electrochemistry characteristics of LiNi0.5 Mn1.5 O4 are investigated by a series of physico-chemical characterizations. XRD results demonstrate that the magnesium and silicon ions successfully enter into the spinel structure and make the lattice parameter slightly increased. Moreover, the magnesium and silicon ions co-doped sample presents superior cycling stability. When cycled at 0.5 C, this sample still delivers 121 mAh g −1 after 100 cycles with outstanding retention of 98.86%, while the undoped LiNi0.5 Mn1.5 O4 sample only exhibits 104.5 mAh g −1 after 100 cycles with low retention of 79.17%. In addition, the Mg 2+ and Si 4+ co-doped sample shows outstanding rate capability and low charge transfer resistance. Highlights: MgSi co-doping strategy is firstly proposed to optimize the electrochemical performance of LiNi0.5 Mn1.5 O4 . MgSi co-doped LiNi0.5 Mn1.5 O4 possesses well-crystallized octahedron and truncated octahedron grains. MgSi co-doped LiNi0.5 Mn1.5 O4 delivers 121 mAh g −1 at 0.5 C after 100 cycles with outstanding retention of 98.86%. MgSi co-doped LiNi0.5 Mn1.5 O4 shows outstanding rate capability and low charge transfer resistance.