2021 Fiscal Year Final Research Report

Elucidation of charge-discharge process of active material/nanoporous carbon composites and its apprication to all-solid-state battery

Research Project

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Project/Area Number	18H02060
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
Research Institution	Nagasaki University
Principal Investigator	MORIGUCHI Isamu 長崎大学, 工学研究科, 教授 (40210158)
Co-Investigator(Kenkyū-buntansha)	瓜田幸幾長崎大学, 工学研究科, 准教授 (40567666)
Project Period (FY)	2018-04-01 – 2022-03-31
Keywords	Liイオン電池 / Naイオン電池 / 全固体電池 / ナノ多孔カーボン / ナノ複合体
Outline of Final Research Achievements	SnS2- or P-embedded porous carbons showed high capacities and stable cycle performance in charge-discharge measurements using organic electrolytes of Li and Na salts. It was surprisingly found that introduction of Red phosphorous in carbon nanotube resulted in a formation of black phosphorous phase, which produces at high pressure condition. Metal sulfide-carbon composites with hierarchical nanostructure also showed excellent charge-discharge properties. It was also demonstrated that SnO2-embedded nanoporous carbons without solid electrolyte inside the nanopores are a promising candidate for high capacity and stable electrode material of all-solid-state battery. Structure-optimized composite electrodes showed high capacity and good cycle stability superior to those in organic liquid electrolyte system. We also succeeded in reduction of external pressure of all-solid-state cell.
Free Research Field	電気化学，ナノ界面科学
Academic Significance and Societal Importance of the Research Achievements	蓄電池の市場拡大に伴い，高エネルギー密度化や高出力化，長寿命化の性能向上，さらには安全性の向上や低コスト化が要求されている。既往のLiイオンのインターカレーションや挿入・脱離反応系を凌駕する高容量を安定に発現できる新しい反応系の開発が必要であり，また，有機電解液を不燃性の無機固体電解質に置き換えた全固体電池系での高容量かつサイクル安定性に優れる電極材料開発が望まれている。本研究の成果は，安定な高容量反応を実現する新材料を開発し，またLiイオン電池にとどまらずNaイオン電池電極材料としての機能発現も手掛け，また安定な全固体電池電極開発の新しいアプローチを提案しており，その意義は極めて大きい。