LITHIUM ION SECONDARY BATTERY, LAMINATE STRUCTURE OF LITHIUM ION SECONDARY BATTERY, AND METHOD FOR MANUFACTURING LITHIUM ION SECONDARY BATTERY

• Main Authors: SAKAWAKI AKIRA, YASUDA TAKENORI, UCHIDA HARUAKI
• Format: Patent
• Language: English; Japanese
• Published: 20.06.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To suppress the delamination of an internal part in an all-solid lithium ion secondary battery.SOLUTION: A lithium ion secondary battery 1 comprises: a positive electrode layer 20 including a positive electrode active material; a solid electrolyte layer 30 including an inorganic solid electrolyte showing a lithium ion conductivity; and a negative electrode current collector layer 50 working as a negative electrode-side electrode. The negative electrode current collector layer 50 comprises: a holding layer 51 including metal titanium and a plurality of columnar crystals each extending in a thickness direction; and a covering layer 52 covering the holding layer 51. In the lithium ion secondary battery 1, a negative electrode 40 made of lithium metal is formed at a grain boundary in the holding layer 51, which is involved in a charging action.SELECTED DRAWING: Figure 1 【課題】全固体リチウムイオン二次電池の内部の剥離を抑制する。【解決手段】リチウムイオン二次電池１は、正極活物質を含む正極層２０と、リチウムイオン伝導性を示す無機固体電解質を含む固体電解質層３０と、負極側の電極として機能する負極集電体層５０と有しており、負極集電体層５０は、金属チタンで構成されるとともにそれぞれが厚さ方向に伸びる複数の柱状結晶を含む保持層５１と、保持層５１を被覆する被覆層５２とを備えている。このリチウムイオン二次電池１には、充電動作に伴って、保持層５１の内部に存在する粒界に、金属リチウムからなる負極４０が形成される。【選択図】図１