GROUP OF LITHIUM-ION SECONDARY BATTERIES AND MANUFACTURING METHOD FOR LITHIUM-ION SECONDARY BATTERIES

• Main Authors: AKIYAMA NAOHISA, HASEGAWA HAJIME, OKADA TAKASHI, TATEISHI MITSURU
• Format: Patent
• Language: English; Japanese
• Published: 08.06.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a group of lithium-ion secondary batteries and a manufacturing method for lithium-ion secondary batteries that can prevent the occurrence of internal short circuits caused by SUS foreign matter while including FSO3- in an electrolyte.SOLUTION: A battery group 100 includes a plurality of lithium-ion secondary batteries 1 of the same type, each of which includes an FSO-containing electrolyte 20 containing FSO 3-. The battery group 100 has a foreign matter-containing battery 1B containing SUS foreign matter 210 made of stainless steel inside the battery. The SUS foreign matter 210 included in the foreign matter-containing battery 1B is covered with a CrF layer 205.SELECTED DRAWING: Figure 3 【課題】電解液中にＦＳＯ3-を含みながらも、ＳＵＳ異物に起因した内部短絡が生じるのを抑制できるリチウムイオン二次電池の電池群及びリチウムイオン二次電池の製造方法を提供する。【解決手段】電池群１００は、ＦＳＯ3-を含むＦＳＯ含有電解液２０を備える複数の同種のリチウムイオン二次電池１からなる。この電池群１００は、電池内部にステンレス鋼からなるＳＵＳ異物２１０を含有する異物含有電池１Ｂを有しており、異物含有電池１Ｂに含まれているＳＵＳ異物２１０は、ＣｒＦ層２０５で覆われている。【選択図】図３