SECONDARY BATTERY

• Main Authors: KAWABUCHI MARI, TAKAICHI SATORU
• Format: Patent
• Language: English; Japanese
• Published: 01.06.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide means capable of preventing occurrence of hydrogen sulfide during storage after a battery is manufactured and during steady operation in a secondary battery using a material containing sulfur.SOLUTION: In a secondary battery having a power generation element including a positive electrode, a negative electrode, and a solid electrolyte layer interposed therebetween, a hydrogen sulfide generation suppressing region where the atomic ratio (O/S ratio) of oxygen(O) atoms to sulfur(S) atoms is 3.0 or more is provided to at least a part of a solid electrolytic layer containing a sulfide solid electrolyte containing lithium(Li), phosphorus(P), sulfur(S) and oxygen(O), or at least a part of a positive electrode active material layer containing a sulfur-containing positive electrode active material containing sulfur(S) and/or a sulfide solid electrolyte containing lithium(Li), phosphorus(P), sulfur(S) and oxygen(O).SELECTED DRAWING: Figure 3 【課題】硫黄を含有する材料を用いた二次電池において、電池の製造後の保管時や定常運転時における硫化水素の発生を防止しうる手段を提供する。【解決手段】正極と、負極と、これらの間に介在する固体電解質層とを含む発電要素を有する二次電池において、リチウム（Ｌｉ）、リン（Ｐ）、硫黄（Ｓ）および酸素（Ｏ）を含有する硫化物固体電解質を含む固体電解質層の少なくとも一部に、あるいは、硫黄（Ｓ）を含有する硫黄含有正極活物質並びに／またはリチウム（Ｌｉ）、リン（Ｐ）、硫黄（Ｓ）および酸素（Ｏ）を含有する硫化物固体電解質を含む正極活物質層の少なくとも一部に、硫黄（Ｓ）原子に対する酸素（Ｏ）原子の原子比率（Ｏ／Ｓ比）が３．０以上である硫化水素発生抑制領域を設ける。【選択図】図３