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2020 Fiscal Year Final Research Report

Creation of Next-Generation Li Batteries with Ultra-Fast Charging and Discharging above 5 V by Introducing Data-Driven Science

Research Project

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Project/Area Number 19K15672
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 36020:Energy-related chemistry
Research InstitutionTokyo Institute of Technology

Principal Investigator

Nakayama Ryo  東京工業大学, 物質理工学院, 研究員 (20833974)

Project Period (FY) 2019-04-01 – 2021-03-31
Keywords全固体Li電池 / 5V級正極 / エピタキシャル薄膜 / ベイズ推定 / ベイズ最適化
Outline of Final Research Achievements

The development of all solid-state Li batteries that can be charged and discharged at high rates above 5 V is an important issue in energy science. Thus, identifying the rate-limiting process of the battery reaction above 5 V is necessary. In this study, all solid-state Li batteries using epitaxial thin film are fabricated, and information science techniques such as Bayesian estimation is applied to clarify the rate-limiting process in charging and discharging above 5 V.
The following three studies were conducted. 1) Development of Bayesian statistics-based analysis of AC impedance spectra, 2) Hyperparameter optimization of Bayesian optimization for materials research, 3)Fabrication and evaluation of all-solid-state Li batteries using epitaxial thin films of 5 V class cathode LiCo0.5Mn1.5O4.

Free Research Field

固体化学

Academic Significance and Societal Importance of the Research Achievements

本研究で開発したベイズ推定を用いたデータ解析手法は、全固体Li電池のみならず、様々な電気化学素子の解析への展開が期待される。また、材料研究に適したベイズ最適化のハイパーパラメータ探索に関する研究は、電池材料はもちろん、様々な新規機能性材料の開発を促進させると考えている。最後に、本研究で作製した電池素子を用いた研究により、5 V以上での電池反応における律速過程は固体電解質/正極における非常に大きな界面抵抗であることが示唆された。今後、固体電解質/正極界面への干渉層導入により、5 V以上の高速充放電の実現が期待できる。

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Published: 2022-01-27  

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