Enhanced electrochemical performance in Ni-doped LiMn2O4-based composite cathodes for lithium-ion batteries

Deng, Y., Mou, J., Wu, H., Zhou, L., Zheng, Q., Lam, K. H. , Xu, C. and Lin, D. (2017) Enhanced electrochemical performance in Ni-doped LiMn2O4-based composite cathodes for lithium-ion batteries. ChemElectroChem, 4(6), pp. 1362-1371. (doi: 10.1002/celc.201600823)

Abstract

High-voltage and high-performance Ni-doped LiMn2O4-basedcomposite cathodes have been obtained from the nominal formula of Li2Mn1-xNixSiO4, synthesized by using a citric acid-assisted sol-gel method. The spinel Li(Mn,Ni)2O4 and layered Li2SiO3 coexist in the composites with x=0 and 0.05, whereas the materials with x=0.15 and 0.25 consist of Li(Mn,Ni)2O4, Li2SiO3 and layered LiNiO2; at x≥ 0.35, the impurity phases of NiO and Ni6MnO8 are detected. A significant improvement in discharge capacity and rate performance of the materials has been caused by the simultaneous existence of LiNiO2 and Li2SiO3. The composite with x=0.25 givesa very high initial discharge capacity of 168 mAh g−1 in the potential range of 3–5 V and exhibits an excellent rate performance. Our study shows that the composites consisting of Li(Mn, Ni)2O4, Li2SiO3, and LiNiO2may be promising candidates for high-voltage and high-performance lithium-ion batteries.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Lam, Dr Koko
• Authors: Deng, Y., Mou, J., Wu, H., Zhou, L., Zheng, Q., Lam, K. H., Xu, C., and Lin, D.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: ChemElectroChem
• Publisher: Wiley
• ISSN: 2196-0216
• ISSN (Online): 2196-0216

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