Development of positive electrode materials with tetrahedral framework structures for Na-ion batteries

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K18242
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Inorganic materials/Physical properties
• Research Institution: Tokyo University of Science
• Principal Investigator: Kubota Kei 東京理科大学, 理学部第一部応用化学科, 講師 (50709756)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: ナトリウム遷移金属酸化物 / 正極材料 / 電池材料 / ナトリウムイオン電池 / カリウムイオン電池 / 二次電池 / 機能性セラミックス材料 / 固体イオニクス材料

Outline of Final Research Achievements

Layered transition-metal oxides and phosphates have been extensively studied as positive electrode materials for Li- and Na-ion batteries. The materials generally consist of MeO6 (Me: transition metals) octahedra in the structure. In order to find new high-performance materials for batteries, alkali-metal containing transition-metal oxides with a MeO4 tetrahedra and the related frameworks are synthesized, and their electrochemical properties are examined. Beta-NaFeO2 shows electrochemically inactive in the Na electrochemical cell. Na4Mn2O5, however, delivers reversible capacities in the Na cell. Furthermore, KCoO2 which has a MeO5 pyramid framework, was evaluated in Li, Na, K cells and amorphization during charge. These results reveal that the materials show obvious difference in voltage curves depending on the polyhedral framework structures as well as transition metals.

Free Research Field

無機固体化学