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成果報告書詳細
管理番号20190000000553
タイトル*2018年度中間年報 先進・革新蓄電池材料評価技術開発(第2期)(国立研究開発法人物質・材料研究機構)
公開日2019/6/11
報告書年度2018 - 2018
委託先名国立研究開発法人物質・材料研究機構
プロジェクト番号P18003
部署名次世代電池・水素部
和文要約
英文要約Title: Development of Fundamental technologies for All Solid State Battery applied to Electric Vehicles (FY2018 - FY2020) FY2018 Annual Report

1. High-voltage cathodes aiming at developing high-energy-density all-solid-state batteries
1.1 Objectives
The application of high-capacity and high-voltage cathode-active-materials to all-solid-state Li batteries is essential to achieve volumetric energy densities of 450 and 800 Wh/L for first- and next-generation batteries. At the National Institute for Materials Science, we aim to determine the voltage range in which interfacial resistance between high-voltage-cathodes and sulfide-solid-electrolytes drastically increases as well as the underlying mechanism for increased interfacial resistance. Furthermore, we aim to develop a novel coating material which effectively suppresses the interfacial resistance observed at 4.5 V- and 5 V-class voltages.

1.2 Results in this year
(1) Spinel LiCo0.5Mn1.5O4 cathode powder
We conducted a study on the effect of charging history at the 5 V-class voltage on the interfacial resistance between the cathode-active-material and sulfide-solid-electrolyte. We attempted to improve the sol-gel coating method using alkoxides that are highly reactive with moisture in the air to coat the cathode powders and achieve a coated cathode with a discharge capacity of 30 mAh/g at a 5 V-class voltage.

(2) Olivine LiCoPO4 cathode film
We conducted a study regarding the effect of substrate material on surface morphology of the LiCoPO4 films prepared by pulsed laser deposition. Films with a smooth and uniform morphology were fabricated and showed a discharge capacity of 20 mAh/g in a sulfide solid electrolyte.
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