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Acta Phys. Chim. Sin.  2014, Vol. 30 Issue (9): 1667-1673    DOI: 10.3866/PKU.WHXB201406251
ELECTROCHEMISTRY AND NEW ENERGY     
Effects of Surface Modification with Ag/C on Electrochemical Properties of Li[Li0.2Mn0.54Ni0.13Co0.13]O2
XUE Qing-Rui1, LI Jian-Ling1, XU Guo-Feng1, HOU Peng-Fei1, YAN Gang1, DAI Yu1, WANG Xin-Dong1, GAO Fei2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China;
2. China Electric Power Research Institute, Beijing 100085, P. R. China
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Abstract  

A lithium-rich solid-solution layered cathode material, Li[Li0.2Mn0.54Ni0.13Co0.13]O2, was synthesized using a fast co-precipitation method, and surface modified withAg/C via chemical deposition. The electrochemical properties, structures, and morphologies of the prepared samples were investigated using X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), galvanostatic charge-discharge cycling, cyclic voltammetry (CV), electrochemical impedance spectra (EIS), and energy dispersive X-ray spectroscopy (EDS). The XRD results showed that the pristine and Ag/Ccoated cathode materials both have hexagonal α-NaFeO2 layered structures with the R3m space group. Microscopic morphological observations and EDS elemental mapping showed that a uniform Ag/C coating layer of thickness 25 nm was deposited on the surfaces of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 particles. The Ag/C-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 material gave an excellent electrochemical performance. The initial discharge capacity (0.05C) of the Ag/C- coated sample was 272.4 mAh ·g-1, with an initial coulombic efficiency of 77.4%, corresponding to 242.6 mAh·g-1 for the pristine sample, with an initial coulombic efficiency of 67.6%, in the potential range 2.0-4.8 V (vs Li/Li+). After 30 cycles (0.2C), the Ag/C-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 retained a capacity of 222.6 mAh·g-1, which was 14.45% higher than that of Li[Li0.2Mn0.54Ni0.13Co0.13]O2. We also found that the Ag/C coating improved the rate capability of the solid-solution material Li[Li0.2Mn0.54Ni0.13Co0.13]O2. The capacity retention (1C) of the Ag/C-coated sample was 81.3%, compared with the capacity at 0.05C. CV and EIS results showed that the Ag/C coating layer suppressed the oxygen release in the initial charge progress and lowered the surface film resistance and electrochemical reaction resistance of the pristine sample.



Key wordsLithium ion battery      Solid solution material      Chemical deposition method      Surface modification      Compound coating     
Received: 09 May 2014      Published: 25 June 2014
MSC2000:  O646  
Fund:  

The project was supported by the National Natural Science Foundation of China (51172023, 51372021), National High Technology Research and Development Program of China (863) (2012AA110302), and Basic Forward-Looking Technology Project of the State Grid Corporation, China (DG71-13-009).

Corresponding Authors: LI Jian-Ling     E-mail: lijianling@ustb.edu.cn
Cite this article:

XUE Qing-Rui, LI Jian-Ling, XU Guo-Feng, HOU Peng-Fei, YAN Gang, DAI Yu, WANG Xin-Dong, GAO Fei. Effects of Surface Modification with Ag/C on Electrochemical Properties of Li[Li0.2Mn0.54Ni0.13Co0.13]O2. Acta Phys. Chim. Sin., 2014, 30(9): 1667-1673.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201406251     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2014/V30/I9/1667

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