Investigation of graphite intercalation compounds of some transition metal chlorides as the cathodematerials for lithium rechargeable battery

某些过渡金属氯化物的石墨插层化合物作为锂二次电池正极材料的研究

• 批准号: 11680507
• 负责人: KISHI Tomiya
• 金额: $ 2.5万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680507/
• 关键词: Graphite intercalation compounds; lithium secondary battery; tantalum chloride; transient metal chlorides; 塩化鉄; 酸化クロム; 遷移金属酸化物

Graphite intercalation compounds (GIC) of some transition metal chlorides have rigid layered structures and high electronic conductivity. In this study, electrochemical insertion of lithium into the GICs of some transition metal chlorides was investigated in order to apply the GICs to the cathode materials for lithium secondary batteries.The electrochemical lithiation behavior of a 1 st stage GIC of tantalum pentachloride, C_<20>TaCl_5, was investigated in 1 M LiClO_4/propylene carbonate electrolyte. The degradation of the stage number from 1 st to higher stages was confirmed at the beginning of the discharge, indicating that the deintercalation of tantalum species from the host material occurred. The pentavalent tantalum species, which is in the host material or in the electrolyte, were considered to be reduced to the lower oxidation states. On the other hand, the charge was impossible.These results showed that the GICs of tantalum chloride are not suit able for cathode materials for lithium secondary batteries. However, it was suggested that lithium can be inserted into the higher stage GICs containing the transition metals which can take various valence states without destruction of the layered structures.

某些过渡金属氯化物的石墨层间化合物（GIC）具有刚性层状结构和高导电性。为了将过渡金属氯化物GIC应用于锂二次电池的正极材料，本文研究了在1 M LiClO_4/碳酸丙烯酯电解液中，第一阶段五氯化钽GIC C_ TaCl_5的电化学嵌锂行为<20>。在放电开始时确认了从第1级到更高级的级数的退化，表明发生了钽物质从主体材料的脱嵌。认为主体材料或电解质中的五价钽物质被还原至较低的氧化态。这些结果表明，氯化钽的GIC不适合作为锂二次电池的正极材料。然而，有人提出，锂可以插入到含有过渡金属的更高级GIC中，所述过渡金属可以采取各种价态而不破坏层状结构。