Lithium borates as a surface protective layer for lithium-manganese spinel

Abstract

The protective properties of the coating applied to the surface of lithium-manganese spinel (LiMn2O4), using the eutectic composition of Li2O : B2O3 = 47 : 53 (wt.) with the melting point of 650°C, were studied. The content of the eutectic lithium borate varied from 1% to 10%. The electrochemical behavior of the obtained materials in the cathode half-cells of lithium-ion battery was studied at room temperature. It was shown that an abnormally large decrease in the specific capacity of lithium-manganese spinel took place simultaneously with the stabilizing effect. The side chemical reactions that occur between LiMn2O4 and the eutectic lithium borate during annealing while applying a protective layer were analyzed. The chemical stability of lithium-manganese spinel (LiMn2O4) and the manganese-containing solid solution with the layered structure, LiNi1/3Mn1/3Co1/3O2, with respect to enriched lithium borates, was compared.

Keywords

• cathode materials
• protective coatings
• lithium-manganese spinel
• lithium borate coating
• chemical interactions