Li-ion storage performance and electrochemically induced phase evolution of layer-structured Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode material

doi:10.1007/s11706-016-0337-9

Front. Mater. Sci.

2016, Vol. 10

Issue (2) : 187-196 https://doi.org/10.1007/s11706-016-0337-9

RESEARCH ARTICLE

Li-ion storage performance and electrochemically induced phase evolution of layer-structured Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ cathode material

Ying WANG²,Hong ZHANG^1,²,Zhiyuan MA²,Gaomin WANG²,Zhicheng LI^1,^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[Li_0.2Mn_0.54Ni_0.13Co_0.13]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·g^–¹ at 25 mA·g^–¹ and 249.2 mA·h·g^–¹ 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 Li₁_–_xMO₂ component followed by into MnO₂ component during the discharge process.

Keywords Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ gel-combustion synthesis phase evolution Li-storage capacity electrochemical reaction

Corresponding Author(s): 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[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ cathode material[J]. Front. Mater. Sci., 2016, 10(2): 187-196.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-016-0337-9
https://academic.hep.com.cn/foms/EN/Y2016/V10/I2/187

Fig.1 XRD patterns of Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ powders calcined at 800°C, 900°C and 1000°C, respectively.

Tab.1 Comparison of lattice parameters of the Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ powders synthesized at various calcination temperatures

Fig.2 Microstructural investigations of Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]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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