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Frontiers of Materials Science

Front. Mater. Sci.    2016, Vol. 10 Issue (2) : 187-196     DOI: 10.1007/s11706-016-0337-9
RESEARCH ARTICLE |
Li-ion storage performance and electrochemically induced phase evolution of layer-structured Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode material
Ying WANG2,Hong ZHANG1,2,Zhiyuan MA2,Gaomin WANG2,Zhicheng LI1,2,*()
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China
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Abstract

Li-rich Li[Li0.2Mn0.54Ni0.13Co0.13]O2 (LMNC) powders were synthesized by a gel-combustion method. The related microstructure, electrochemical performance and electrochemically induced phase evolution were characterized. The 900°C calcined powders have a hexagonal layered structure with high ordered degree and low cationic mixing level. The calcined materials as cathode electrode for Li-ion battery deliver the high electrochemical properties with an initial discharge capacity of 243.5 mA·h·g1 at 25 mA·g1 and 249.2 mA·h·g1 even after 50 cycles. The electrochemically induced phase evolution investigated by a transmission electron microscopy indicates that Li+ ions deintercalated first from the LiMO2 (M= Mn, Co, Ni) component and then from Li2MnO3 component in the LMNC during the charge process, while Li+ ions intercalated into Li1xMO2 component followed by into MnO2 component during the discharge process.

Keywords Li[Li0.2Mn0.54Ni0.13Co0.13]O2      gel-combustion synthesis      phase evolution      Li-storage capacity      electrochemical reaction     
Corresponding Authors: Zhicheng LI   
Online First Date: 14 April 2016    Issue Date: 11 May 2016
 Cite this article:   
Ying WANG,Hong ZHANG,Zhiyuan MA, et al. Li-ion storage performance and electrochemically induced phase evolution of layer-structured Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode material[J]. Front. Mater. Sci., 2016, 10(2): 187-196.
 URL:  
http://journal.hep.com.cn/foms/EN/10.1007/s11706-016-0337-9
http://journal.hep.com.cn/foms/EN/Y2016/V10/I2/187
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Ying WANG
Hong ZHANG
Zhiyuan MA
Gaomin WANG
Zhicheng LI
Fig.1  XRD patterns of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 powders calcined at 800°C, 900°C and 1000°C, respectively.
Calcination temperature /°C Lattice parameters RmI003/I104 R0(I006+I102)/I101
a /? c /? c/a
800 2.8502(8) 14.2485(9) 4.999 1.4426 0.4629
900 2.8483(5) 14.2377(5) 4.998 1.8937 0.2896
1000 2.8519(7) 14.25373(2) 4.997 1.5713 0.3267
Tab.1  Comparison of lattice parameters of the Li[Li0.2Mn0.54Ni0.13Co0.13]O2 powders synthesized at various calcination temperatures
Fig.2  Microstructural investigations of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 powders calcined at 900°C: (a) SEM image; (b) TEM bright-field image and the related SAED pattern; (c) HRTEM image.
Fig.3  Electrochemical characteristics of the LMNC cathode materials: (a) first three CV curves of an assembled cell with the LMNC-900 material; (b) initial charge?discharge curves of the LMNC calcined at various temperatures.
Fig.4  Electrochemical performance of LMNC materials: (a) comparison of cycling performance of LMNC calcined at various temperatures; (b) comparison of rate capabilities of the LMNC cathodes calcined at various temperatures; (c) rate capabilities of LMNC-900.
Fig.5  EIS spectra for the cells with LMNC-800, LMNC-900 and LMNC-1000, respectively: (a) before charge/discharge process; (b) after 50 electrochemical cycles at 25 mA·g-1.
Fig.6  TEM investigations of LMNC-900 charged/discharged to different stages in the first electrochemical cycle: (a) charged to 4.2 V; (b) charged to 4.7 V; (c) discharged to 3.8 V; (d) discharged to 3.2 V.
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