Exploration of Ultra-High Voltage Cathodes for Rechargeable Batteries

可充电电池用超高压正极的探索

• 批准号: 20F20038
• 负责人: 山田 淳夫
• 金额: $ 1.47万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2020
• 资助国家: 日本
• 起止时间: 2020-04-24 至 2022-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20F20038/
• 关键词: Battery; Cathode; High-Voltage; Capacity; Polyanion; Insertion host

The research in 2021 fy focussed on exploring high voltage electro-active materials with increased operating voltages and capacities. One direction of research dwelled on study of mixed polyanionic system (VO)2SO4PO4 for their lithium insertion performances. We expected the incorporation of oxy, sulphate and phosphate anions to render stable framework for alkali ion (Li/Na) insertion with a superior cycling performance. Indeed, we could achieve decent electrochemical performance. However, the structural solutions of the proposed system revealed it to be mixture of phases and could not account for its electrochemical performance, thus making the research ambiguous at this point. Another direction focussed on phase transformations in Na-Fe-S-O quaternary sulphate systems. Here we studied intimate relationship between various Na-Fe-S-O and their hydrated phase with reaction temperature. Also, we studied extensively a metastable phase Na2Fe2(SO4)2 system for its stability, sensitivity, and decent electrochemical activities. This proposed work is near completion, and I am complying all these results for journal publication.

2021年的研究重点是探索具有增加的工作电压和能力的高压电动材料。研究方向的一个方向涉及混合聚苯故系统（VO）2SO4PO4的锂插入性能。我们期望将氧气，硫酸盐和磷酸盐阴离子掺入，以使稳定的框架（LI/NA）插入具有出色的循环性能。确实，我们可以实现体面的电化学性能。但是，所提出的系统的结构解决方案表明它是相的混合物，无法解释其电化学性能，因此在这一点上含糊不清。另一个方向集中在Na-Fe-S-S-O四元素硫酸盐系统中的相变。在这里，我们研究了各种NA-FE-S-O与它们与反应温度的水合相之间的紧密关系。另外，我们为其稳定性，灵敏度和体面的电化学活性进行了广泛的亚稳态Na2fe2（SO4）2系统。这项建议的工作即将完成，我正在遵守所有这些结果以供期刊出版。

项目成果

東京大学 工学系研究科 化学システム工学専攻 山田研究室

东京大学大学院工学研究科化学系统工学科山田研究室

Designing positive electrodes with high energy density for lithium-ion batteries

• DOI: 10.1039/d0ta10252k
• 发表时间: 2021-03
• 期刊: Journal of Materials Chemistry A
• 影响因子: 11.9
• 作者: M. Okubo;Seongjae Ko;Debasmita Dwibedi;A. Yamada