The Study on the Amorphous Oxides as Cathodes for Lithium Secondary Battery

非晶氧化物作为锂二次电池正极的研究

• 批准号: 63470058
• 负责人: YAMAMOTO Osamu
• 金额: $ 4.42万
• 依托单位: Mie University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63470058/
• 关键词: Lithium Secondary Battery; Amorphous Oxides; Brannerite Type Oxides; Mixed Electrolytes; Lithium-Carbon Composite Electrode; Intercalation; カ-ボンファイバ-; スピネル型酸化物; ブランメラーライト型酸化物

From the aspects of developing the practical lithium secondary battery, the various cathode, anode and electrolyte materials were investigated. As a theme for each subject, we selected (1) the study on the amorphous oxides based on Cr_3O_8 and V_2O_5, (2) developing the salty electrolyte salt substituted for LiClO_4, and (3) the study on the lithium-carbon composite electrode as anode for lithium secondary battery, respectively. The results for these studies during the term of this project were mentioned below.(1) The amorphous Cr_3O_8 prepared from crystal Cr_3O_8 showed the superior characteristics. It has high energy density, high power density and good cyclability. It is discharged homogeneously because of its amorphous structure, of which the potential energy is flattened and the discharge proceeds very smoothly. One of the problems of this compound was the difficulties of making fine of each Cr_3O_8 particle. This results in the worse charge-discharge characteristics at the high … More rate discharging. The brannerite type compound CuV_<2-x>Mo_xO_6 also showed the good cyclability. In addition, there is the interesting feature that the intercalation and deintercalation of lithium and copper occurred in alternate directions at the same time. And the vanadium rich composition compared with the molybdenum rich one has the amorphous structure and shows the good charge-discharge characteristics. (2) In respect of current density and cyclability, the LiPF_6 in PC : DME (1 : 1) electrolyte had the best properties among all electrolytes. (3) It was shown that lithium-carbon composite electrode restrained the formation of lithium dendrites on the lithium substrate. The reaction between lithium and carbon depends on the structure of carbon which means the crystallinity, orientation etc. The higher crystallinity showed the larger amount of lithium accommodation. It is proved that the orientation of carbon crystal has a large effect on the rate of lithium intercalation. From these knowledge, the most suitable structure as the anode of lithium secondary battery was proposed. Less

从开发实用化锂二次电池的角度出发，对各种正极、负极和电解质材料进行了研究。作为每个课题的主题，我们分别选择了（1）基于Cr_3O_8和V_2O_5的非晶氧化物的研究，（2）开发替代LiClO_4的咸电解质盐，以及（3）作为锂二次电池负极的锂碳复合电极的研究。本课题期间的研究结果如下：(1)由晶体Cr_3O_8制备的非晶态Cr_3O_8表现出优异的特性。具有高能量密度、高功率密度和良好的循环性能。由于其非晶结构，放电均匀，势能平坦，放电进行得很顺利。该化合物的问题之一是Cr_3O_8颗粒的细化困难。这导致高倍率放电时的充放电特性变差。镁锰矿型化合物CuV_<2-x>Mo_xO_6也表现出良好的循环性能。此外，还有一个有趣的特征，即锂和铜的嵌入和脱嵌同时以交替方向发生。并且富钒组合物与富钼组合物相比具有非晶结构并表现出良好的充放电特性。 (2)在电流密度和循环性能方面,PC:DME(1:1)电解液中LiPF_6的性能是所有电解液中最好的。 (3)结果表明，锂碳复合电极抑制了锂基体上锂枝晶的形成。锂和碳之间的反应取决于碳的结构，即结晶度、取向等。结晶度越高，表明容纳的锂量越大。事实证明，碳晶体的取向对嵌锂速率有很大影响。根据这些知识，提出了最适合作为锂二次电池负极的结构。较少的

项目成果

Y.Takeda: "Characteristics of Brannerite Type CuV_<2ーx>Mo_xO_6(O≦x≦1) Cathodes for Lithium Cells" J.Electrochem.Soc.

Y.Takeda：“锂电池用Brannerite型CuV_<2ーx>Mo_xO_6(O≤x≤1)阴极的特性”J.Electrochem.Soc。

R.Kanno: J.power sources.

R.Kanno：J.电源。

R. Kanno,: "Carbon as Negative Electrodes in Lithium Secondary Cells" J. Power Sources. 26. 535-543 (1989)

R. Kanno，：“碳作为锂二次电池的负极”J. Power Sources。

菅野了次: "リチウム二次電池用カ-ボンファイバ-負極の充放電機構" 電気化学会誌. 57. 614-615 (1989)

Ryoji Kanno：“锂二次电池用碳纤维负极的充放电机理”，《电化学学会杂志》57. 614-615（1989）。

Y.Takeda: "Characteristics of Brannerite Type Cu V_<2-x>MOxO_6 Cathode for Lithium Cells" J.Electrochem Soc.

Y.Takeda：“锂电池用镁铝矿型 Cu V_<2-x>MOxO_6 阴极的特性”J.Electrochem Soc。