| abstract |
PROBLEM TO BE SOLVED: To provide a sufficiently small initial charge / discharge irreversible capacity and excellent discharge load characteristics, charge acceptance and cycle even when an active material layer having a negative electrode material on a current collector is densified for high capacity. A non-aqueous secondary battery having characteristics is provided. SOLUTION: When a composite graphite particle used for a negative electrode material for a non-aqueous secondary battery and having an electrode active material density of 1.8 ± 0.03 g / cm 3 using the negative electrode material is prepared. And a composite graphite particle for a non-aqueous secondary battery, wherein the porosity in the electrode obtained by measuring a cross-sectional image of the electrode is 7.5% or more and 30% or less, and a negative electrode material containing the composite graphite particle , Negative electrode and non-aqueous secondary battery. [Selection figure] None |