Study on the electrochemical performance of Cu-added LiNi0.6Co0.2Mn0.2O2

QIU Shitao; ZHONG Shengwen; LI Tingting; YANG Jinmeng; TIAN Feng

doi:10.13264/j.cnki.ysjskx.2018.05.004

Volume 9 Issue 5

Oct. 2018

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Nonferrous Metals Science and Engineering > 2018 > 9(5): 21-25. > DOI: 10.13264/j.cnki.ysjskx.2018.05.004

QIU Shitao, ZHONG Shengwen, LI Tingting, YANG Jinmeng, TIAN Feng. Study on the electrochemical performance of Cu-added LiNi_0.6Co_0.2Mn_0.2O₂[J]. Nonferrous Metals Science and Engineering, 2018, 9(5): 21-25. DOI: 10.13264/j.cnki.ysjskx.2018.05.004

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Study on the electrochemical performance of Cu-added LiNi_0.6Co_0.2Mn_0.2O₂

QIU Shitao^{a, b},
ZHONG Shengwen^{a, b, ,},
LI Tingting^{a, b},
YANG Jinmeng^{a, b},
TIAN Feng^{a, b}

a.
School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
b.
Jiangxi Key Laboratory of Power Battery and Materials, Jiangxi University of Science and Technology, Ganzhou 341000, China

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Received Date: July 12, 2018
Published Date: October 30, 2018

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Abstract

Abstract

The precursor was prepared by co-precipitation and Li (Ni_0.6Co_0.2Mn_0.2)_1-xCu_xO₂ (x=0, 0.01, 0.015 and 0.02) was synthesized by high temperature solid-state reaction. In this study, the structure, morphology and electrochemical properties of Li (Ni_0.6Co_0.2Mn_0.2)_1-xCu_xO₂ were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), battery test system (BTS) and electrochemical workstation. The results showed that, with a small amount of Cu, α-NaFeO₂type structure was formed in all the samples with no impurities; the peak splitting of the sample (108)/(110) was obvious with a good layered structure; then, with the increase of Cu, c and c/a, interlayer distance and the deintercalation channels of Li+ all increased, so the conductivity improved. The ratios of I₍₀₀₃₎/I₍₁₀₄₎ were 1.467 and 1.438, respectively, with 1 % Cu and 1.5 % Cu, higher than the ratio of 1.431 without any addition of Cu and at the same time reducing cation mixing. The specific discharge capacities for the first time were 170.6, 164.1, 163.6 and 162.4 mAh/g, respectively. When x was 0, 1 %, 2 % after 100 cycles, the retention rates were 87.1 %, 98.7 %, and 87.7 %, respectively; when x was 1.5 %, the specific capacity increasing from 161.8 to 173.9 mAh/g, Li(Ni0.6Co0.2Mn0.2)_1-xCu_xO₂ obtained its best electrochemical performance.
- Cu adding,
- LiNi_0.6Co_0.2Mn_0.2O₂,
- lithium-ion battery,
- electrochemical performance

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References

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Study on the electrochemical performance of Cu-added LiNi_0.6Co_0.2Mn_0.2O₂