SODIUM ION SECONDARY BATTERY

• Main Authors: HARADA KEIZO, MAEDA KAZUYUKI, INAZAWA SHINJI
• Format: Patent
• Language: English; Japanese
• Published: 12.09.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To suppress the electrolysis of water when charging a sodium ion secondary battery containing an aqueous electrolyte solution.SOLUTION: A sodium ion secondary battery comprises: a positive electrode; a negative electrode; an aqueous electrolyte interposed between the positive and negative electrodes and containing sodium ions; and an ionic liquid interposed between the aqueous electrolyte solution and the negative electrode. The negative electrode contains a negative electrode active material which develops a capacity as a result of a reaction in which a sodium ion participates. The ion liquid contains an organic cation having hydrophobicity. The sodium ion secondary battery further comprises a solid electrolyte layer having sodium ion conductivity between the negative electrode active material and the ion liquid.SELECTED DRAWING: Figure 1 【課題】水溶液電解質を具備するナトリウムイオン二次電池において充電時の水の電気分解を抑制する。【解決手段】正極と、負極と、正極と負極との間に介在するナトリウムイオンを含む水溶液電解質と、水溶液電解質と負極との間に介在するイオン液体とを具備し、負極が、ナトリウムイオンが関与する反応により容量を発現する負極活物質を含み、イオン液体が、疎水性を有する有機カチオンを含み、負極活物質とイオン液体との間に、ナトリウムイオン伝導性を有する固体電解質層を有する、ナトリウムイオン二次電池。【選択図】図１