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Negative electrode for lithium ion secondary battery, and lithium ion secondary battery
| Content Provider | Semantic Scholar |
|---|---|
| Author | 慶一, 高橋 |
| Copyright Year | 2011 |
| Abstract | Provided is a lithium ion secondary battery, in which high-capacity artificial graphite particles each having an amorphous carbon layer formed on the surface thereof are used as a negative electrode active material, and in which the deterioration in cycle properties during being used under charge-discharge conditions at a high current density can be prevented by improving electrical conductivity and heat-dissipating properties. Thus, a negative electrode for a lithium ion secondary battery comprises a core material and a negative electrode active material layer formed on the surface of the core material, wherein the negative electrode active material layer comprises first carbon particles, second carbon particles and a binder. Each of the first carbon particles comprises an artificial graphite particle and an amorphous carbon layer formed on the surface of the artificial graphite particle. The second carbon particles are natural graphite microparticles. The first carbon particles have a median diameter (D 1 50 ) of 5-25 μm, the second carbon particles have a median diameter (D 2 50 ) of 0.2-10 μm, and D 1 50 and D 2 50 fulfill a relationship represented by the formula D 1 50 > D 2 50 . The amount of the second carbon particles is 1-10 parts by mass relative to 100 parts by mass of the first carbon particles. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://patentimages.storage.googleapis.com/12/b2/a1/ad28a94d9fefd1/US20070065720A1.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Patent |
