To provide a secondary battery which can show a superior life characteristic at a low temperature, and a superior life characteristic at a high temperature.SOLUTION: A secondary battery comprising a positive electrode 5, a negative electrode 3 and a nonaqueous electrolyte is provided according to an embodiment hereof. An active material composite 30 of the negative electrode 3 includes: active material particles 30A; and a coating film 30B covering at least a part of the surface thereof and containing N and Si. The N concentration in the coating film 30B decreases from a first surface 30C toward a second surface 30D. The Si concentration in the coating film 30B increases from the first surface 30C toward the second surface 30D. The nonaqueous electrolyte satisfies the expressions: (1) 0≤B/A≤0.5; (2) 0 wt.%

    【課題】低温での優れた寿命特性及び高温での優れた寿命特性を示すことができる二次電池を提供すること。【解決手段】実施形態によれば、正極5と、負極3と、非水電解質とを具備する二次電池が提供される。負極3の活物質複合体30は、活物質粒子30Aと、その表面の少なくとも一部を被覆し且つN及びSiを含む被膜30Bとを含む。被膜30B中のN濃度は、第1の表面30Cから第2の表面30Dに向かって減少する。被膜30B中のSiの濃度は、第1の表面30Cから第2の表面30Dに向かって増加する。非水電解質は、下記式(1):0≦B/A≦0.5;(2)0重量%<A≦2.0重量%;及び(3):0重量%≦B≦0.25重量%を満たす。ここで、Aは、非水電解質におけるシリル基含有化合物の濃度[重量%]である。Bは、非水電解質におけるジイソシアネート化合物の濃度[重量%]である。【選択図】 図2


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    Title :

    SECONDARY BATTERY, BATTERY PACK AND VEHICLE


    Additional title:

    二次電池、電池パック及び車両


    Contributors:

    Publication date :

    2019-09-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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