Effects of the Mn/Li molar ratio on the fabrication process of lithium manganese oxide cathode electrode for lithium-ion batteries

  • Hieu Le Trung Institute of Chemistry and Materials, Academy of Military Science and Technology
  • Hoành Ngô Văn Institute of Chemistry and Materials, Academy of Military Science and Technology
  • Quang Trần Danh Khoa Cơ khí - Vũ khí, Trường Cao đẳng Công nghiệp quốc phòng
  • Mạnh Vũ Hữu Le Quy Don Technical University
  • Cành Nguyễn Văn Institute of Chemistry and Materials, Academy of Military Science and Technology
  • Ngô Tiến Quyết VNU University of Science
  • Tường Nguyễn Mạnh Institute of Chemistry and Materials, Academy of Military Science and Technology
Keywords: Lithium manganese oxide; Cathode material; Lithium ion batteries; MnO2.

Abstract

Lithium-ion batteries utilizing lithium manganese oxide (LiMn2O4 - LMO) as the cathode electrode exhibit high voltage and capacity, making them an ideal power source with extensive potential applications. The Mn/Li molar ratio during the fabrication process has a significant influence on the characteristics of LMO. Herein, a sustainable source of Mn was used to fabricate LMO electrode materials. The impact of the Mn/Li molar ratios on the structure and electrochemical properties of LMO was thoroughly investigated. The results revealed that when the Mn/Li molar ratio was 2.0:1.2, a well-defined LiMn2O4 crystal structure with high purity was obtained. The electrode exhibited fast lithium ion intercalation/deintercalation kinetics, reaching a specific capacity of 110 mAh/g at 0.1 C and maintaining 50 mAh/g after 1000 cycles at a high discharge rate of 2 C. This study demonstrates the influence of the Mn/Li ratios in LMO fabrication and provides guidance for the development of various other cathode electrode materials for lithium-ion batteries.

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Published
2023-10-25
Issue
Vol. 90 (2023)
Section
Overview