SECONDARY BATTERY, BATTERY PACK, VEHICLE, AND FIXED POWER SUPPLY

• Main Authors: MATSUNO SHINSUKE, SEKIGUCHI YUMIKO, TAKAMI NORIO
• Format: Patent
• Language: English; Japanese
• Published: 27.09.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a secondary battery indicating an excellent charge and discharge efficiency.SOLUTION: According to an embodiment, a secondary battery is provided. The secondary battery comprises: a negative electrode; a positive electrode; and an aqueous electrolyte. The negative electrode comprises: a negative electrode collector containing aluminum; and a negative electrode active material containing layer provided onto the negative electrode collector and containing a titanium containing oxidation. At least one part of a front surface of the negative electrode active material containing layer, comprises a coating film containing an aluminum containing chemical material. The aqueous electrolyte contains: a zinc ion; and a heterocyclic compound having an aromatic ring and a hetero atom. A weight ratio of the zinc ion and the heterocyclic compound in the aqueous electrolyte is within a range of 0.4 or larger to 250 or less.SELECTED DRAWING: Figure 1 【課題】優れた充放電効率を示す二次電池を提供すること。【解決手段】１つの実施形態によると、二次電池が提供される。二次電池は、負極と、正極と、水系電解質とを備える。負極は、アルミニウムを含む負極集電体、及び、前記負極集電体上に設けられ、チタン含有酸化物を含む負極活物質含有層を備える。負極活物質含有層の表面の少なくとも一部は、アルミニウム含有化合物を含む被膜を備える。水系電解質は、亜鉛イオンと、芳香環及びヘテロ原子を有する複素環式化合物とを含む。水系電解質における、亜鉛イオンと複素環式化合物との重量比は０．４以上２５０以下の範囲内にある。【選択図】 図１