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

• Published in: Электрохимическая энергетика
• Main Authors: Koshkina, Anastasia A., Yaroslavtseva, Tatiana V., Urusova, Natalia V., Reznizkikh, Olga G., Khrustalev, Mikhail A., Nefedova, Kseniya Valer'evna, Zhuravlev, Viktor Dmitrievich, Bushkova, Ol'ga Viktorovna
• Format: Article
• Language: English
• Published: Saratov State University 2024-06-01
• Subjects: cathode materials; protective coatings; lithium-manganese spinel; lithium borate coating; chemical interactions
• Online Access: https://energetica.sgu.ru/sites/energetica.sgu.ru/files/text-pdf/2024/07/electro_2024_2_88-102.pdf
• ISSN: 1608-4039; 1680-9505

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.