ELECTRODE STRUCTURE, ELECTRODE GROUP, SECONDARY BATTERY, BATTERY PACK, VEHICLE, AND STATIONARY POWER SUPPLY

• Main Authors: MATSUNO SHINSUKE, SEKIGUCHI YUMIKO, HOTTA YASUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 25.03.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRICITY; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

To provide an electrode structure and an electrode group that can realize a secondary battery that exhibits high charge/discharge efficiency and suppresses self-discharge, a secondary battery and a battery pack that exhibit high charge/discharge efficiency and suppress self-discharge, and a vehicle with the battery pack, and stationary power supply.SOLUTION: An electrode structure according to an embodiment includes an electrode structure including an electrode and a composite film. The electrode includes an active material-containing layer and a current collector layer. The active material-containing layer includes a first main surface and a second main surface behind the first main surface. The current collector layer is in contact with the second main surface of the active material-containing layer. The composite film includes a composite layer in contact with the first main surface of the active material-containing layer. The composite layer includes inorganic solid particles and a polymeric material. The peel strength σ1 at the first interface between the active material-containing layer and the composite layer and the peel strength σ2 at the second interface between the active material-containing layer and the current collector layer satisfy the relationship of σ1>σ2. The peel strength σ2 satisfies σ2≤1 N/cm.SELECTED DRAWING: Figure 1 【課題】高い充放電効率を示すとともに自己放電が抑制された二次電池を実現できる電極構造体および電極群、高い充放電効率を示すとともに自己放電が抑制された二次電池および電池パック、並びに、当該電池パックを備えた車両および定置用電源を提供すること。【解決手段】実施形態によれば、電極と複合膜とを具備する電極構造体が提供される。電極は、活物質含有層と集電層とを含む。活物質含有層は、第１主面と、第１主面の裏側に在る第２主面とを含む。集電層は、活物質含有層の第２主面と接する。複合膜は、活物質含有層の第１主面と接する複合層を含む。複合層は、無機固体粒子と高分子材料とを含む。活物質含有層と複合層との第１界面における剥離強度σ１と、活物質含有層と集電層との第２界面における剥離強度σ２とが、σ１＞σ２の関係を満たす。剥離強度σ２が、σ２≦１Ｎ／ｃｍを満たす。【選択図】 図１