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成果報告書詳細
管理番号20190000000580
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)(公立大学法人大阪府立大学)
公開日2019/6/11
報告書年度2018 - 2018
委託先名公立大学法人大阪府立大学
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


The present R&D was conducted to establish high-energy all-solid-state batteries for electronic vehicle applications. Activities involved in this R&D are summarized below.

[Liquid-phase synthesis of sulfide-based solid electrolyte]
In FY 2018, we worked on low-temperature synthesis of argyrodite-type solid electrolytes with high lithium-ion conductivity. We developed argyrodite-type solid electrolytes that decompose under high-temperature treatment. Other effects of heat treatment were also analyzed. Crystal structure analysis was conducted to investigate the influence of difference in heat treatment temperature on crystallinity and anion occupancy.

[Control of interface and structure of electrode composite by the dry blending process]
In FY 2018, the dry coating of the graphite particle with the solid electrolyte was investigated. The optimum operating parameters were determined. For the fundamental parametric study, dry coating with sodium sulfate, which is the model material of the sulfide solid electrolyte, was performed. It was found that the amount of the model solid electrolyte covering the graphite core particle was small. To overcome this issue, we proposed modifying the hydrophobic surface of the pristine graphite particle to a hydrophilic surface. As a result, the amount of the model solid electrolyte coating the graphite particle was improved.

[R&D of moisture resistant sulfide electrolytes]
In this R&D, we are attempting to find novel compositions and structures of sulfide electrolytes that do not deteriorate even in dry air environments to reduce the processing cost of all solid-state batteries. LixMS4 (M = Sn, Sb) electrolytes and their solid solutions were investigated.

[TEM analysis of solid electrolyte and all-solid-state batteries]
1) A pair distribution function (PDF) analysis method by TEM was developed. We identified the difference in atomic correlation between glass and crystallized glass.
2) To clarify the origin of exothermal reactions, the structural changes of NMC-LPS composites were investigated. It was found that significant structural changes occurred after heating above 300 °C.
3) A quantitative analysis method of crystallinity degree via dark-field TEM imaging was established. It was confirmed that this method can be used to evaluate the crystallinity degree quantitatively with results as good as those of the electron diffraction method.

[Oxide-based positive electrode active material with good formability]
In FY2018, oxide-based positive electrode materials of LiCoO2-Li2SO4 and Li2RuO3-Li2SO4 types were produced by the mechanochemical method, and operation characteristics of all solid-state LIB using sulfide-based solid electrolyte were evaluated. We also performed structural analysis using XAFS and XPS.
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