NONAQUEOUS ELECTROLYTE BATTERY, BATTERY PACK AND VEHICLE

• Main Authors: YASUDA KAZUHIRO, TAKAMI NORIO, HOSHINA KEIGO, YAMASHITA YASUNOBU, ISOZAKI YOSHIYUKI
• Format: Patent
• Language: English; Japanese
• Published: 21.09.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery which makes possible to suppress the reduction in capacity, and the swelling of a cell.SOLUTION: A nonaqueous electrolyte battery according to an embodiment comprises: a positive electrode; a negative electrode; and a nonaqueous electrolyte. The negative electrode includes a negative electrode active material including a titanium oxide, and has a coating covering at least a part of the surface of the negative electrode. The coating includes fluorine, and satisfies the following expression (1): 0.2≤F1/F2≤0.8 (1). In the expression (1), F1 represents a percentage (%) of fluorine atoms binding to organic atoms in fluorine atoms that the coating includes, and F2 represents a percentage (%) of fluorine atoms binding to metal atoms in fluorine atoms that the coating includes.SELECTED DRAWING: Figure 7 【課題】容量低下及びセル膨れを抑制可能な非水電解質電池を提供すること。【解決手段】実施形態に係る非水電解質電池は、正極と、負極と、非水電解質とを具備する。負極は、チタン酸化物を含む負極活物質を含み、負極の表面の少なくとも一部を被覆している被膜を有する。被膜は、フッ素を含み、下記式（１）を満たす。０．２≦Ｆ１／Ｆ２≦０．８ ...（１）式（１）中、Ｆ１は、被膜が含んでいるフッ素原子のうち、有機系原子に結合したフッ素原子の割合（％）であり、Ｆ２は、被膜が含んでいるフッ素原子のうち、金属原子に結合したフッ素原子の割合（％）である。【選択図】 図７