Chemical engineering approach to control of electrode-electrolyte junction interface of all solid state lithium battery

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02501
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 27010:Transport phenomena and unit operations-related
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Taniguchi Izumi 東京工業大学, 物質理工学院, 准教授 (00217126)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 噴霧熱分解法 / 球状ナノ構造粒子 / 正極材料 / リチウム二次電池 / 全固体リチウム二次電池

Outline of Final Research Achievements

Using the spray pyrolysis method, we synthesized sulfur-rich nonstoichiometric copper sulfide (CuSx+1, 0≦x≦1.0). Electrochemical measurements of these materials revealed that the material with the composition CuS1.58 had excellent electrochemical properties. Furthermore, the CuS1.58@ acetylene black composite exhibited an extremely large discharge capacity. Synthesis　of spherical nanostructured LiNi1/3Co1/3Mn1/3O2 particles and coating their surfaces with LiNbO3 and Li2Si2O5 were also carried out. Furthermore, we demonstrated that spherical porous LiCoPO4 microparticles could be successfully synthesized by spray pyrolysis with citrate additives.

Free Research Field

粉体工学

Academic Significance and Societal Importance of the Research Achievements

高エネルギー密度を有する正極材料（CuS1.58）を見出したことは、全固体リチウム二次電池に限らず高エネルギー密度を有する蓄電池の開発にとって重要な成果である。さらに、全固体電池の正極材料として、LiNbO3 やLi2Si2O5をその材料表面にコーティングする際に、良好な接触界面を構築できる多孔質ナノ構造正極材料の新規な合成法を見出した点は学術的にも社会的にも意義のある成果と考えられる。