Effects of Constituent Elements on the Electrochemical Characteristics of Composites of LiF and Several Spinel Oxides as Cathode Materials for Li-Ion Batteries

Yasumasa Tomita (), Yuki Yoshida, Yusuke Izumi and Yoshiumi Kohno
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Yasumasa Tomita: Department of Applied Chemistry and Biochemical Engineering, Faculty of Engineering, Shizuoka University, 3-5-1, Johoku, Chuo-ku, Hamamatsu 432-8561, Shizuoka, Japan
Yuki Yoshida: Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1, Johoku, Chuo-ku, Hamamatsu 432-8561, Shizuoka, Japan
Yusuke Izumi: Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1, Johoku, Chuo-ku, Hamamatsu 432-8561, Shizuoka, Japan
Yoshiumi Kohno: Department of Applied Chemistry and Biochemical Engineering, Faculty of Engineering, Shizuoka University, 3-5-1, Johoku, Chuo-ku, Hamamatsu 432-8561, Shizuoka, Japan

Energies, 2025, vol. 18, issue 21, 1-12

Abstract: 4LiF-MM’ 2 O 4 composites were synthesized via the mechanical milling of LiF and MM’ 2 O 4 (M = Mn, Mg, Zn; M’ = Mn Fe) for 72 h. In the obtained composites, the XRD peak broadened because of the milling, and the composites possessed a rock-salt-type structure. During charge–discharge measurements at 0.1 C, composites with spinel materials containing Mg showed particularly high discharge capacities; the discharge capacity of 4LiF-MMn 2 O 4 and 4LiF-MFe 2 O 4 was 310 mAh/g and 309 mAh/g, respectively. The discharge voltage was approximately 3.2 V for 4LiF-MgMn 2 O 4 and approximately 2.8 V for 4LiF-MgFe 2 O 4 , and 4LiF-MgMn 2 O 4 composites had the highest energy densities, exceeding 1000 Wh/kg. During cycle characteristic measurements with a cutoff voltage of 4.8 V and 4.4 V, the initial capacity retentions at the 100th cycle were 11% and 79%, respectively. The Coulombic efficiency was also better at a cutoff voltage of 4.4 V than that of 4.8 V, indicating that electrolyte decomposition has a significant influence on the cycle characteristics. Additionally, composites were synthesized via mechanical milling using various molar ratios of LiF and MgMn 2 O 4 . In xLiF-MgMn 2 O 4 (x ≥ 3), the discharge potential was approximately 3.2 V, and the discharge capacity was higher than 250 mAh/g. The highest discharge capacity was observed for 4LiF-MgMn 2 O 4 among xLiF-MgMn 2 O 4 (x ≥ 3) composites.

Keywords: cathode materials; lithium-ion secondary battery; mechanical milling; LiF composite; spinel oxide (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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