Structural and Electrochemical Studies on the Depolarizability of Manganese Dioxides
二氧化锰去极化性的结构和电化学研究
基本信息
- 批准号:61470075
- 负责人:
- 金额:$ 3.65万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1986
- 资助国家:日本
- 起止时间:1986 至 1987
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The fundamental reseach on the depolarizability of manganese dioxide has been developed during the past two years. The objectives in this series of experimental and theoretical works are;(1) to understand the "depolarizability" of manganese dioxide both in aqueous and nonaqueous cells in terms of the theoretical electrochemistry combined with structural inorganic chemistory, and(2) to establish some fundamentals on the redox electrochemistory of materials in electrochemical systems, which include the soluble transition metal ions and the organic compounds together with the mixed valence inorganic compounds.Specific experimental and theoretical works done are;(1) a study on the homogeneous electrochemical reaction of manganese dioxide, which recognized as an ideal S-shaped potential curve in the potential vs. the reduction degree plots, and(2) a study on the distorted S-shaped potential curve of L-niobium pentoxide in lithium nonaqueous cell.In order to support these studies, the electrochemical behaviors of the transition metal ions in an acid solution and of the organic compounds in a nonaqueous solution were also examined and the redox properties of materials were specified in terms of electron donor and acceptor.Topotactic reductions of manganese dioxide and L-niobium pentoxide were confirmed by ex-situ X-ray diffraction studies and the reaction mechanisms were proposed. A theory to explain the potential curves of some mixed valence compounds were developed on the basis of statistical thermodynamics, in which the roles of charge charriers in a solid matrix on the electrochemical reaction were emphasized.
二氧化锰脱极化性能的基础研究是近两年来开展的。这一系列实验和理论工作的目标是;(1)从理论电化学和结构无机化学的角度了解二氧化锰在水和非水电池中的“去极化性”;(2)建立电化学系统中材料的氧化还原电化学的一些基础,包括可溶过渡金属离子和有机化合物以及混合价态无机化合物。所做的具体实验和理论工作有;(1)研究了二氧化锰的均相电化学反应,在电位-还原度图中发现了理想的s型电位曲线;(2)研究了非水锂电池中l -五氧化二铌的扭曲s型电位曲线。为了支持这些研究,我们还研究了过渡金属离子在酸性溶液中的电化学行为和有机化合物在非水溶液中的电化学行为,并根据电子供体和受体规定了材料的氧化还原性质。通过非原位x射线衍射研究证实了二氧化锰和l -五氧化二铌的拓扑还原,并提出了反应机理。在统计热力学的基础上,提出了一种解释混合价化合物电位曲线的理论,强调了固体基质中电荷载体在电化学反应中的作用。
项目成果
期刊论文数量(40)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
AKIRA KUNUGI: Proc. 1st Int. Symp. Electroorganic Synthesis. 253-256 (1987)
AKIRA KUNUGI:Proc。
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TSUTOMU OHZUKU: "On the Heat-treated Electrolytic Manganese Dioxide -its structure, physicochemical properties, and electrochemical activity-" Progress in Batteries & Solar Cells. 8. (1987)
TSUTOMU OHZUKU:“热处理电解二氧化锰的结构、物理化学性质和电化学活性”电池进展
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TSUTOMU OHZUKU: J. Power Sources. 19. 287-299 (1987)
TSUTOMU OHZUKU:J. 电源。
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TSUTOMU OHZUKU: "Similarities and Differences in Electrochemical Character of Layered and Spinel-Related Manganese Oxides" Chemistry Express. 2. 543-546 (1987)
TSUTOMU OHZUKU:“层状和尖晶石相关锰氧化物电化学特性的异同”Chemistry Express。
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