| abstract |
Provided is a non-aqueous secondary battery that has a sufficiently small charge-discharge irreversible capacity during an initial cycle, excellent charge acceptance, and excellent cycle characteristics even when an active material layer having a negative electrode material is densified. A non-aqueous secondary battery comprising composite graphite particles (B) in which spherical graphite particles (A) and graphitized binders that can be graphitized are combined, satisfying (a) and / or (b). Composite graphite particles for use. (a) The cumulative 50% diameter D50, 90% diameter D90, and 10% diameter D10 of the spherical graphite particles (A) and the composite graphite particles (B) by the laser light diffraction method satisfy the formulas 1, 2, and 3; 1.1 ≦ D50 (B) / D50 (A) ≦ 2.0 (Formula 1), 1.1 ≦ D90 (B) / D90 (A) ≦ 2.4 (Formula 2), 1.0 ≦ D10 (B) / D10 (A) ≦ 1.8 (Formula 3 ), (B) When the values of the ratio of the 110 plane and the 004 plane measured from XRD of the spherical graphite particles (A) and the composite graphite particles (B) are x and y, the ratio z is 1.2 to 3.5 is there: [Selection figure] None |