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Sol-Gel Synthesis of Silicon-Doped Lithium Manganese Oxide with Enhanced Reversible Capacity and Cycling Stability

1
School of Mechanical & Electrical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China
2
Research Branch of Advanced Materials & Green Energy, Henan Institute of Science and Technology, Xinxiang 453003, China
3
School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(8), 1455; https://doi.org/10.3390/ma11081455
Received: 12 July 2018 / Revised: 2 August 2018 / Accepted: 14 August 2018 / Published: 15 August 2018
(This article belongs to the Section Energy Materials)
A series of silicon-doped lithium manganese oxides were obtained via a sol-gel process. XRD characterization results indicate that the silicon-doped samples retain the spinel structure of LiMn2O4. Electrochemical tests show that introducing silicon ions into the spinel structure can have a great effect on reversible capacity and cycling stability. When cycled at 0.5 C, the optimal Si-doped LiMn2O4 can exhibit a pretty high initial capacity of 140.8 mAh g−1 with excellent retention of 91.1% after 100 cycles, which is higher than that of the LiMn2O4, LiMn1.975Si0.025O4, and LiMn1.925Si0.075O4 samples. Moreover, the optimal Si-doped LiMn2O4 can exhibit 88.3 mAh g−1 with satisfactory cycling performance at 10 C. These satisfactory results are mainly contributed by the more regular and increased MnO6 octahedra and even size distribution in the silicon-doped samples obtained by sol-gel technology. View Full-Text
Keywords: lithium-ion batteries; LiMn2O4; sol-gel method; Si-doping; electrochemical properties lithium-ion batteries; LiMn2O4; sol-gel method; Si-doping; electrochemical properties
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Zhao, H.; Li, D.; Wang, Y.; Li, F.; Wang, G.; Wu, T.; Wang, Z.; Li, Y.; Su, J. Sol-Gel Synthesis of Silicon-Doped Lithium Manganese Oxide with Enhanced Reversible Capacity and Cycling Stability. Materials 2018, 11, 1455.

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