SECONDARY BATTERY, BATTERY PACK, VEHICLE AND STATIONARY POWER SUPPLY

• Main Authors: MATSUNO SHINSUKE, SEKIGUCHI YUMIKO, HOTTA YASUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 29.03.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide: a secondary battery which exhibits excellent charge/discharge efficiency and discharge capacity; a battery pack including the secondary battery; and a vehicle and a stationary power supply which include the battery pack.SOLUTION: According to an embodiment, there is provided a secondary battery including a negative electrode containing a titanium-containing oxide, a positive electrode, a separator located between the negative electrode and the positive electrode, a first aqueous electrolyte, a second aqueous electrolyte and a third aqueous electrolyte. The first aqueous electrolyte is held by the negative electrode and contains 0.001 mass% or more and 0.5 mass% or less of zinc ions. The second aqueous electrolyte is held by the separator and contains 1 mass% or more and 5 mass% or less of a first compound having a hydrophobic part and a hydrophilic part. The third aqueous electrolyte is held by the positive electrode.SELECTED DRAWING: Figure 4 【課題】優れた充放電効率および放電容量を示す二次電池、この二次電池を備えた電池パック、並びに、この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、チタン含有酸化物を含む負極と、正極と、負極と正極との間に位置するセパレータと、第１水系電解質と、第２水系電解質と、第３水系電解質と、を具備する二次電池が提供される。第１水系電解質は、負極に保持され、亜鉛イオンを０．００１質量％以上０．５質量％以下含む。第２水系電解質は、セパレータに保持され、疎水部と親水部とを有する第１化合物を１質量％以上５質量％以下含む。第３水系電解質は、正極に保持される。【選択図】 図４