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Conflicting roles of F doping on electrochemical performance of layered-spinel Li1.2Mn0.75Ni0.25O2-zFz as cathode materials for Li-ion batteries

•Introduction of F-doped layered-spinel Li1.2Mn0.75Ni0.25O2-zFz cathode materials.•F doping has confilicting roles on electrochemical performance of cathode materials.•The cycle stability depends on the F doping content. Herein, the conflicting roles of F doping on the electrochemical performance of...

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Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2023-08, Vol.943, Article 117575
Main Authors: Vu, Ngoc Hung, Vu, Hong Ha Thi, Xuan Nang, Ho, Thi Dien, Phan, Thi Hoa, Le, Im, Won Bin, Thu Ha, Vu, Anh Tuyen, Luu, Quang Hung, Nguyen, Dao, Van-Duong
Format: Article
Language:English
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Summary:•Introduction of F-doped layered-spinel Li1.2Mn0.75Ni0.25O2-zFz cathode materials.•F doping has confilicting roles on electrochemical performance of cathode materials.•The cycle stability depends on the F doping content. Herein, the conflicting roles of F doping on the electrochemical performance of layered-spinel Li1.2Mn0.75Ni0.25O2-zFz (z = 0, 0.05, 0.1) cathode materials are studied. The compound consists of Li1.2Mn0.6Ni0.2O2 and LiMn1.5Ni0.5O4 with their phase ratio depending on F doping content. When z = 0.05, it favors the spinel phase formation, leading to increased first Coulombic efficiency and improved cycle stability. However, it reduces the cathode capacity to 250 mAh g−1 at C/10 (the capacity of the pristine is 280 mAhg−1). With F doping content increasing to z = 0.1, the cycle stability of the cathode is the best, with 96 % capacity retention after 200 cycles at C/2. The high level of F stabilizes the structure, prevents phase transition, and retards voltage decay. The result demonstrates a promising strategy for the design of composite cathode materials by F doping.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2023.117575