Negative electrode for non-aqueous secondary battery and non-aqueous secondary battery using the negative electrode
Provided with a negative electrode for a secondary battery comprising an anode active material that is a mixture of an amorphous carbon-coated graphite active material A having a density of 1.50 g/cm 3 or less in press pelletizing at 2 kN/cm 2 and a carbon-based active material B having a density of 1.65 g/cm 3 or higher in press pelletizing at 2 kN/cm 2 in a weight ratio of 90:10 to 99:1 as A:B, so that the cracking of amorphous carbon-coated graphite is suppressed and high-temperature life characteristics is improved.
1. A negative electrode for a secondary battery, the negative electrode comprising,
an anode active material that is a mixture of an amorphous carbon-coated graphite active material A having a density of 1.50 g/cm 3 or less in press pelletizing at 2 kN/cm 2 and a carbon-based active material B having a density of 1.65 g/cm 3 or higher in press pelletizing at 2 kN/cm 2 in a weight ratio of 92:8 to 98:2 as A:B, and
a binder,
wherein the negative electrode is formed by pressing so that a density of the negative electrode is 1.46 g/cm 3 or more and 1.70 g/cm 3 or less.
2. The negative electrode for the secondary battery according to claim 1 , wherein an Id/Ig ratio of the active material B in Raman spectrum is 0.2 or less.
3. The negative electrode for the secondary battery according to claim 1 , wherein the active material comprises graphite whose d 002 is 0.3365 nm or less.
4. The negative electrode for the secondary battery according to claim 1 , wherein an average particle diameter D50 of the active material A is larger than that of the active material B.
5. The negative electrode for the secondary battery according to claim 4 , wherein the average particle diameter D50 of the active material A is 10 μm or more and 30 μm or less and the average particle diameter D50 of the active material B is 5 μm or more and 15 μm or less.
6. A non-aqueous secondary battery comprising the negative electrode for the secondary battery according to claim 1 .
7. The negative electrode for the secondary battery according to claim 2 , wherein the active material comprises graphite whose d 002 is 0.3365 nm or less.
8. The negative electrode for the secondary battery according to claim 2 , wherein an average particle diameter D50 of the active material A is larger than that of the active material B.
9. The negative electrode for the secondary battery according to claim 8 , wherein the average particle diameter D50 of the active material A is 10 μm or more and 30 μm or less and the average particle diameter D50 of the active material B is 5 μm or more and 15 μm or less.
10. A non-aqueous secondary battery comprising the negative electrode for the secondary battery according to claim 2 .
11. The negative electrode for the secondary battery according to claim 3 , wherein an average particle diameter D50 of the active material A is larger than that of the active material B.
12. The negative electrode for the secondary battery according to claim 11 , wherein the average particle diameter D50 of the active material A is 10 μm or more and 30 μm or less and the average particle diameter D50 of the active material B is 5 μm or more and 15 μm or less.
13. A non-aqueous secondary battery comprising the negative electrode for the secondary battery according to claim 3 .
14. A non-aqueous secondary battery comprising the negative electrode for the secondary battery according to claim 4 .
15. A non-aqueous secondary battery comprising the negative electrode for the secondary battery according to claim 5 .