Improving the Electrochemical Properties of a Cathode Material Based on Lithium–Manganese Phosphate through the Partial Substitution of Mn for Ni

• Published in: Nanobiotechnology Reports (Online) 2023-12, Vol.18 (Suppl 2), p.S286-S292
• Main Authors: Drozhzhin, O. A., Zharikova, E. V., Lakienko, G. P., Rozova, M. G., Antipov, E. V.
• Format: Article
• Language: English
• Subjects: Cathodes; Charge transfer; Chemistry and Materials Science; Electrochemical analysis; Electrode materials; Industrial and Production Engineering; Ion currents; Lithium compounds; Lithium-ion batteries; Low temperature; Machines; Manganese; Manufacturing; Materials Science; Nanomaterials for Functional and Structural Purposes; Nanotechnology; Nickel; Phosphates; Processes; Rechargeable batteries; Specific energy; Structural stability; Substitutes; Transition metals; X ray powder diffraction
• ISSN: 2635-1676; 1995-0780; 2635-1684; 1995-0799
• DOI: 10.1134/S2635167624600111

Lithium and transition-metal phosphates are promising cathode materials for lithium-ion batteries. Lithium manganese phosphate LiMnPO 4 has a higher specific energy density than LiFePO 4 used in practice: theoretical values of 700 and 580 W h/kg, respectively. However, its use is hampered by a number of disadvantages: reduced electronic and ionic conductivity, inferior stability of the structure in the charged form, and large changes in the volume during (de)lithiation. LiMnPO 4 and LiMn 0.95 Ni 0.05 PO 4 samples are synthesized by the solvothermal method and studied using X-ray powder diffraction, low-temperature nitrogen adsorption, scanning electron microscopy, and electrochemical methods. It is shown that a small degree of substitution of Mn for Ni (5 at %) leads to an increase in the capacity and Coulombic efficiency of LiMnPO 4 , a decrease in charge-transfer resistance, and an increase in Li + diffusion coefficients.