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Enhanced Cycling Stability of LiCuxMn1.95−xSi0.05O4 Cathode Material Obtained by Solid-State Method

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 Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(8), 1302; https://doi.org/10.3390/ma11081302
Received: 9 July 2018 / Revised: 20 July 2018 / Accepted: 25 July 2018 / Published: 27 July 2018
(This article belongs to the Section Energy Materials)
The LiCuxMn1.95−xSi0.05O4 (x = 0, 0.02, 0.05, 0.08) samples have been obtained by a simple solid-state method. XRD and SEM characterization results indicate that the Cu-Si co-doped spinels retain the inherent structure of LiMn2O4 and possess uniform particle size distribution. Electrochemical tests show that the optimal Cu-doping amount produces an obvious improvement effect on the cycling stability of LiMn1.95Si0.05O4. When cycled at 0.5 C, the optimal LiCu0.05Mn1.90Si0.05O4 sample exhibits an initial capacity of 127.3 mAh g−1 with excellent retention of 95.7% after 200 cycles. Moreover, when the cycling rate climbs to 10 C, the LiCu0.05Mn1.90Si0.05O4 sample exhibits 82.3 mAh g−1 with satisfactory cycling performance. In particular, when cycled at 55 °C, this co-doped sample can show an outstanding retention of 94.0% after 100 cycles, whiles the LiMn1.95Si0.05O4 only exhibits low retention of 79.1%. Such impressive performance shows that the addition of copper ions in the Si-doped spinel effectively remedy the shortcomings of the single Si-doping strategy and the Cu-Si co-doped spinel can show excellent cycling stability. View Full-Text
Keywords: lithium-ion batteries; cathode material; LiMn2O4; Cu-Si co-doping; cycling stability lithium-ion batteries; cathode material; LiMn2O4; Cu-Si co-doping; cycling stability
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Zhao, H.; Li, F.; Bai, X.; Wu, T.; Wang, Z.; Li, Y.; Su, J. Enhanced Cycling Stability of LiCuxMn1.95−xSi0.05O4 Cathode Material Obtained by Solid-State Method. Materials 2018, 11, 1302.

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