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Crystals 2017, 7(9), 275; doi:10.3390/cryst7090275

The Effects of a Mixed Precipitant on the Morphology and Electrochemical Performance of LiNi0.5Mn1.5O4 Cathode Materials

1
School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China
2
Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editors: Lan Xiang, Jing Wang, Huijun Wu, Guo Gao, Yongcheng Jin and Yi Xia
Received: 2 August 2017 / Revised: 7 September 2017 / Accepted: 8 September 2017 / Published: 14 September 2017
(This article belongs to the Special Issue Solution-Processed Inorganic Functional Crystals)
View Full-Text   |   Download PDF [6791 KB, uploaded 14 September 2017]   |  

Abstract

A series of LiNi0.5Mn1.5O4 (LNMO) samples were synthesized by adjusting the molar ratio of (NH4)2CO3 to Na2CO3 in a mixed precipitant for evaluating the effects of ammonia from (NH4)2CO3 as a complexing agent and Na2CO3 as a precipitant on the morphology and electrochemical performances of LNMO. In this research, a rapid precipitation method followed by hydrothermal treatment was used to prepare the precursors of LNMO, and different molar ratios (0:1, 1:2, 1:1, 2:1, 1:0) of (NH4)2CO3 to Na2CO3 were used for mixed precipitants. The test results revealed that the cathode material exhibits the best electrochemical performance when the molar ratio of (NH4)2CO3 to Na2CO3 is set at 1:2, displaying a specific discharge capacity of 129.4 mA h g−1 at 0.5 C and a capacity retention of 82.3% after 200 charge–discharge cycles. In addition, it still shows a high rate performance with a discharge capacity of 112.7 mA h g−1 at 10 C and 98.8 mA h g−1 at 20 C, which is attributed to an accurate Ni/Mn ratio, smaller primary particle sizes and a porous spherical morphology. View Full-Text
Keywords: rapid precipitation; hydrothermal treatment; mixed precipitants; spherical morphology rapid precipitation; hydrothermal treatment; mixed precipitants; spherical morphology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Shu, Y.; Yan, W.; Wang, H.; Jiang, J.; Sun, D.; Ma, X.; Jin, Y. The Effects of a Mixed Precipitant on the Morphology and Electrochemical Performance of LiNi0.5Mn1.5O4 Cathode Materials. Crystals 2017, 7, 275.

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