Citation: REN Ning, LU Shi-Gang. Li₃PO₄ Surface Modification to Improve Performance of LiNi_0.5Mn_1.5O₄ Cathode Material[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(3): 499-507. doi: 10.11862/CJIC.2016.068 shu

Li₃PO₄ Surface Modification to Improve Performance of LiNi_0.5Mn_1.5O₄ Cathode Material

REN Ning ^*,, ,
LU Shi-Gang ^*,,

General Research Institute for Nonferrous Metals, Beijing 100088, China

Corresponding author: REN Ning, rnrm040412@163.com LU Shi-Gang, lusg8867@163.com
Received Date: 3 August 2015
Revised Date: 26 November 2015

Figures(10)

Spherical LiNi_0.5Mn_1.5O₄@Li₃PO₄ composite was prepared by a co-precipitation method. The structure and electrochemical performance were investigated by X-ray powder diffraction (XRD), scanning electron microscope (SEM), FT-IR spectroscopy, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge-discharge measurements. XRD and SEM shows that Li₃PO₄ coating influence the lattice parameter of LiNi_0.5Mn_1.5O₄ composed of spherical particle size. CV and EIS imply that 5% (mass percent) Li₃PO₄-coated LiNi_0.5Mn_1.5O₄ has higher reversible intercalation and deintercalation of Li⁺, larger lithium-ion diffusion coefficient and smaller charge transfer resistance corresponding to a much higher conductivity than those of pristine LiNi_0.5Mn_1.5O₄ corresponding to the extraction of Li⁺ ions. Charge-discharge test reveals that the in situ Li₃PO₄ modifying improves the electronic conductivity of the electrode in the local environment, electrochemical activity, and then results in their relatively higher capacity at high charge-discharge rate. The enhanced performance of 5% (mass percent) Li₃PO₄-coated LiNi_0.5Mn_1.5O₄ is ascribed to the improved electronic conduction and the reduced polarization resulting from the Li₃PO₄ modification together with sphere-like particles composed of nano particle LiNi_0.5Mn_1.5O₄.
- lithium-ion battery,
- cathode materials,
- surface coating,
- electrochemical performance
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Li₃PO₄ Surface Modification to Improve Performance of LiNi_0.5Mn_1.5O₄ Cathode Material