Conflicting roles of F doping on electrochemical performance of layered-spinel Li1.2Mn0.75Ni0.25O2-zFz as cathode materials for Li-ion batteries
- Authors
- Vu, Ngoc Hung; Vu, Hong Ha Thi; Xuan Nang, Ho; Thi Hoa, Le; Im, Won Bin; Thu Ha, Vu; Anh Tuyen, Luu; Thi Dien, Phan; Quang Hung, Nguyen; Dao, Van-Duong
- Issue Date
- Aug-2023
- Publisher
- Elsevier B.V.
- Keywords
- Spinel-layered; Li1; 2Mn0; 6Ni0; Fluorine doping; Cathode; Li-ion batteries
- Citation
- Journal of Electroanalytical Chemistry, v.943, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Electroanalytical Chemistry
- Volume
- 943
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/192417
- DOI
- 10.1016/j.jelechem.2023.117575
- ISSN
- 1572-6657
- Abstract
- 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.
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