報告書番号

Q09001

タイトル（和文）

全固体型リチウムイオン電池の開発(III) - LiNi1/3Mn1/3Co1/3O2正極を用いた電池における入出力特性の支配因子 -

タイトル（英文）

Development for All Solid-State Lithium Batteries (III) - Improvement in power performance of battery with LiNi1/3Mn1/3Co1/3O2 -

概要 （図表や脚注は「報告書全文」に掲載しております）

電力系統へ大型蓄電池を導入する動向の中で、その候補の一つとして全固体型リチウムイオン電池に着目し、研究開発を進めている。本研究では、全固体電池の入出力特性を向上させるため、リチウム塩濃度をパラメータとして高分子電解質のイオン導電率、電池の出力特性、正極/電解質界面でのイオン移動過程を測定した。その結果、電池の入出力特性は、電解質のイオン導電率よりも正極界面のイオン移動過程と相関があることを、リチウム塩濃度の検討、充放電試験、動的インピーダンス測定法から見出した。この相関から、全固体型電池の入出力特性を支配する指針が得られた。

概要 （英文）

The battery performances such as cycle and C-rate of all solid-state lithium polymer batteries were measured with the solid polymer electrolytes controlled the ratio of [Li] / [O] in LiBF4 / P(EO/MEEGE). The later performances were found to depend on the ratio, and have the optimized value of [Li] / [O] = 0.1. Three-electrode cells with polymer electrolytes were prepared to found the relationship for the C-rate performance and the interfacial behavior between positive electrode and electrolyte, to measure the dynamic (In-situ) ac impedance with charge-discharging at C/8. These results indicated that the lithium-ion migration speed of intercalation / deintercalation at interface between the positive electrode / electrolyte was the relative to the ratio of [Li] / [O]. The ratio obviously influenced the activity of lithium-ion at electrode / electrolyte neighborhood interface. These results concluded that the deintercalation process of lithium-ion at the interface was relatively faster (slower) than the intercalation in the cases of high (low) activity of lithium-ion of electrode sided neighborhood interface, and low (high) activity of lithium-ion of electrolyte sided neighborhood interface.

報告者

キーワード