Li-rich manganese layered cathode materials doped with W

LIU Zhiliang; LI Xiaolin; LEI Chao; LI Dong; WANG Chunxiang; CHEN Jingbo; ZHONG Shengwen

doi:10.13264/j.cnki.ysjskx.2020.06.008

Volume 11 Issue 6

Dec. 2020

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Nonferrous Metals Science and Engineering > 2020 > 11(6): 57-63. > DOI: 10.13264/j.cnki.ysjskx.2020.06.008

LIU Zhiliang, LI Xiaolin, LEI Chao, LI Dong, WANG Chunxiang, CHEN Jingbo, ZHONG Shengwen. Li-rich manganese layered cathode materials doped with W[J]. Nonferrous Metals Science and Engineering, 2020, 11(6): 57-63. DOI: 10.13264/j.cnki.ysjskx.2020.06.008

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Li-rich manganese layered cathode materials doped with W

1.
Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
2.
School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

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Received Date: July 19, 2020
Published Date: December 30, 2020

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Abstract

Abstract

Lithium-rich manganese materials have high specific capacity and charge-discharge voltage platform, but large irreversible capacity. The bonding between transition metals and oxygen was enhanced by W doping in lithium-rich manganese cathode materials, with inhibited lattice oxygen shedding during the first charge-discharge process. Meanwhile, XRD refinement results showed that W-doping increased the interlayer spacing of lithium-rich manganese layered materials, promoted the diffusion of lithium ions, reduced the electrochemical impedance of materials, with an effective improvement of the cycle stability and rate performance of materials. Electrochemical tests show that the performance is the most favorable when W is doped at 3%, and the discharge specific capacities at 0.2 C, 3 C and 5 C are 211.3 mAh/g, 132.6 mAh/g and 114.61 mAh/g, respectively, which are 10.5%, 7.8% and 12.58% higher than those of undoped lithium-rich manganese materials.
- layered cathode,
- doping,
- low impedance,
- cyclic stability

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