全固体リチウム二次電池用ガラス材料の作製と評価(第60回日本セラミックス協会進歩賞受賞に関する総説及び論文)

概要

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Glass is an attractive material as a solid electrolyte and an electrode for all-solid-state lithium secondary batteries. In the present paper, the preparation and characterization of Li_2S-based oxysulfide glasses and sulfide glass-ceramics as solid electrolytes are reviewed. In particular, two strategies of enhancing Li^+ conductivity are proposed; one strategy is the utilization of "mixed-anion effect" by combining sulfide and oxide anions (in oxy-sulfide systems) and the other is the precipitation of superionic metastable crystals by careful heat-treatment of glasses. The superior Li^+ conducting solid electrolytes with the highest conductivity and the lowest activation energy for conduction have been achieved in the Li_2S-P_2S_5 glass-ceramics. For the SnO-based glasses as a negative electrode in a lithium ion cell, the relationship between electrochemical performance and local structure is also discussed. All-ceramic electrochemical cells using the oxysulfide glassy electrolytes and the SnO-B_2O_3 glassy electrodes were fabricated and then characterized as a lithium secondary battery.
社団法人日本セラミックス協会の論文
2007-02-01