Citation: 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[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂[J]. Acta Physico-Chimica Sinica, ;2014, 30(9): 1667-1673. doi: 10.3866/PKU.WHXB201406251 shu

Effects of Surface Modification with Ag/C on Electrochemical Properties of Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂

1.
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

Received Date: 9 May 2014
Available Online: 25 June 2014
Fund Project:

A lithium-rich solid-solution layered cathode material, Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]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 hexa nal 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[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ particles. The Ag/C-coated Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]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[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ retained a capacity of 222.6 mAh·g^-1, which was 14.45% higher than that of Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂. We also found that the Ag/C coating improved the rate capability of the solid-solution material Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]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.
- Lithium ion battery,
- Solid solution material,
- Chemical deposition method,
- Surface modification,
- Compound coating
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Effects of Surface Modification with Ag/C on Electrochemical Properties of Li[Li0.2Mn0.54Ni0.13Co0.13]O2

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通讯作者: 陈斌, bchen63@163.com

Effects of Surface Modification with Ag/C on Electrochemical Properties of Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂