| abstract |
PROBLEM TO BE SOLVED: To provide a non-aqueous secondary battery system that constitutes a non-aqueous secondary battery having excellent safety, high output, and long life and can make use of the characteristics of the non-aqueous secondary battery. SOLUTION: A lithium titanium composite oxide having a spinel structure or a ramsdellite structure as an active material, a negative electrode containing a conductive assistant, a positive electrode using a lithium-containing composite oxide having a spinel structure as an active material, and a non-aqueous electrolyte In the non-aqueous secondary battery, the average particle diameter of the primary particles of the negative electrode active material is 1 μm or less, carbon particles having a particle diameter of 0.1 μm or less as a conductive auxiliary for the negative electrode, and the fiber length is The negative electrode with respect to the capacity of the positive electrode, containing at least one kind of fibrous carbon having a particle diameter of 1 μm or more and flaky carbon having a particle diameter of 1 μm or more, and having an average particle diameter of primary particles of the positive electrode active material of 3 μm or less The capacity ratio is 0.92 to 1.2. [Selection figure] None |