Journal of Inorganic Materials, Volume. 37, Issue 9, 1023(2022)

Microscopic Mechanism of K+ Doping on Performance of Lithium Manganese Cathode for Li-ion Battery

Yang WANG1...2, Guangxin FAN1,3,*, Pei LIU2, Jinpei YIN1, Baozhong LIU2, Linjian ZHU3 and Chengguo LUO3 |Show fewer author(s)
Author Affiliations
  • 11. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
  • 22. College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
  • 33. Jiaozuo Banlv Nano Materials Engineering Co., Ltd, Jiaozuo 454000, China
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    Improving the high rate performance of lithium manganese spinel is one of the key research directions of Li-ion battery. In this study, spinel Li1.1-xKxMn2O4 (0≤x≤0.03) was synthesized by a high-temperature solid-state method. The results indicate that K+ doping significantly improved the high rate performance of the cathode, while the discharge specific capacity of the electrode decreased with the current density increasing. With the optimum doping amount of 1.0% (molar fraction) K+, the discharge specific capacity of the cathode increased by 102.8% at 10C (1C=150 mA·g-1), much higher than that (1.9%) at 0.5C. It can be attributed to the following points: K+ doping can firstly expand the cell volume and the Li-O bond length, lower the cation mixing of Li/Mn, and increase the content of carriers (Mn3+) of the material. Secondly, K+ doping can reduce the electrode polarization and charges transfer resistance, which develops the charge-discharge reversibility, electrical conductivity as well as the diffusion capability of the Li ions for the cathode. Thirdly, K+ doping can stabilize the framework of [Mn2]O4, degrade the change of internal stress during the electrochemical process, which inhibits the modification of the crystal structure and particle fragmentation. In addition, the existence of K+ promotes the agglomeration of the material during the preparation process, which reduces the contact area between the electrolyte and cathode in cell, thereby alleviating the erosion of the electrolyte, as well as the Mn dissolution of the cathode.

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    Yang WANG, Guangxin FAN, Pei LIU, Jinpei YIN, Baozhong LIU, Linjian ZHU, Chengguo LUO. Microscopic Mechanism of K+ Doping on Performance of Lithium Manganese Cathode for Li-ion Battery [J]. Journal of Inorganic Materials, 2022, 37(9): 1023

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    Paper Information

    Category: RESEARCH ARTICLE

    Received: Dec. 10, 2021

    Accepted: --

    Published Online: Jan. 12, 2023

    The Author Email: FAN Guangxin (fangx@hpu.edu.cn)

    DOI:10.15541/jim20210757

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