Multilayer-structured carbon material for nonaqueous electrolytic solution secondary battery negative electrode, negative electrode for nonaqueous secondary battery, lithium ion secondary battery, and process for producing multilayer-structured carbon material for nonaqueous electrolytic solution secondary battery negative electrode

1. A multilayer-structured carbon material for a nonaqueous electrolytic solution secondary battery negative electrode, which satisfies the following (a) and (b):

(a) (Void fraction calculated from DBP oil absorption)/(Void fraction calculated from tapping density) is less than 1.01; and

(b) Surface oxygen content (O/C) determined by X-ray photoelectron spectroscopy is 1.5 atomic % or more.

2. A multilayer-structured carbon material for a nonaqueous electrolytic solution secondary battery negative electrode, which comprises graphite particles and amorphous carbon that coats the surface of the graphite particles, and satisfies the following (a):

(a) (Void fraction calculated from DBP oil absorption)/(Void fraction calculated from tapping density) is less than 1.01.

3. A multilayer-structured carbon material for a nonaqueous electrolytic solution secondary battery negative electrode, which comprises graphite particles and graphite carbon that coats the surface of the graphite particles, and satisfies the following (a) and (b):

(a) (Void fraction calculated from DBP oil absorption)/(Void fraction calculated from tapping density) is less than 1.01; and

(b) Surface oxygen content (O/C) determined by X-ray photoelectron spectroscopy is 1.5 atomic % or more.

4. The multilayer-structured carbon material for a nonaqueous electrolytic solution secondary battery negative electrode according to claim 1 , wherein the DBP oil absorption is 75 ml/100 g or less and a Raman value R determined from Raman spectrometry is 0.15 or more.

5. The multilayer-structured carbon material for a nonaqueous electrolytic solution secondary battery negative electrode according to claim 1 , wherein a ratio of the number of particles of 3 μm or less observed on a flow particle image analyzer is 5% or more.

6. A negative electrode for a nonaqueous electrolytic solution secondary battery, comprising a current collector and an active material layer formed on the current collector, wherein the active material layer contains the multilayer-structured carbon material for a nonaqueous electrolytic solution secondary battery negative electrode according to claim 1 .

7. A lithium ion secondary battery, comprising: a positive electrode and a negative electrode capable of occluding and releasing lithium ion; and an electrolyte wherein the negative electrode is the negative electrode for a nonaqueous electrolytic solution secondary battery according to claim 6 .

8. A process for producing a multilayer-structured carbon material for a nonaqueous electrolytic solution secondary battery negative electrode, which comprises subjecting a multilayer-structured carbon raw material to a cracking treatment, wherein, in the cracking treatment, power per weight of the multilayer-structured carbon raw material is 50 W/kg or more and 3,000 W/kg or less; and

wherein the multilayer-structured carbon material satisfies the following (a) and (b);

(a) (Void fraction calculated from DBP oil absorption)/(Void fraction calculated from tapping density) is less than 1.01; and

(b) Surface oxygen content (O/C) determined by X-ray photoelectron spectroscopy is 1.5 atomic % or more.

9. The process for producing a multilayer-structured carbon material for a nonaqueous electrolytic solution secondary battery negative electrode according to claim 8 , wherein the cracking treatment is performed under an oxygen atmosphere.

10. The process for producing a multilayer-structured carbon material for a nonaqueous electrolytic solution secondary battery negative electrode according to claim 8 , wherein the cracking treatment is performed for a treatment time of 0.1 minutes to 120 minutes.