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财年的研究重点是探索具有更高工作电压和容量的高压电活性材料。聚阴离子（VO）_2SO_4PO_4混合体系嵌锂性能的研究是目前的研究方向之一。我们期望氧、硫酸根和磷酸根阴离子的掺入为碱金属离子（Li/Na）插入提供稳定的框架，具有上级循环性能。事实上，我们可以实现体面的电化学性能。然而，所提出的系统的结构解决方案显示它是相的混合物，并且不能解释其电化学性能，从而使研究在这一点上模糊不清。另一个研究方向是Na-Fe-S-O四元硫酸盐体系的相变。本文研究了各种Na-Fe-S-O及其水化相与反应温度的密切关系。此外，我们广泛研究了亚稳相Na_2Fe_2（SO_4）_2体系的稳定性、灵敏度和良好的电化学活性。这项拟议的工作即将完成，我遵守所有这些结果的期刊出版。

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