To obtain a nonaqueous electrolyte secondary battery with high capacity and excellent in cycle characteristics, by improving an anode active material and nonaqueous electrolyte solution for using the nonaqueous electrolyte secondary battery.
In the nonaqueous electrolyte secondary battery equipped with a cathode 11 containing a cathode active material capable of absorbing/emitting lithium ions, an anode 12 containing an anode active material capable of absorbing/emitting lithium ions, and nonaqueous electrolyte solution, the anode active material is processed with the use of a first material consisting of a graphite material and a second material of a complex body having a graphite material and silicon or silicon compound with amorphous carbon material coated and ratio of silicon in the complex body to be 17 mass% or more and 30 mass% or less, a ratio of the second material in the anode active material is made to be 5 mass% or more and 13 mass% or less, and also, cyclic carbonate derivative containing fluorine atom is added into the nonaqueous electrolyte solution.
NOMURA SHUN
TAKAHASHI KATSUAKI
FUJIMOTO HIROYUKI
| JP2004146292A | 2004-05-20 | |||
| JP2006332020A | 2006-12-07 |
Hiroshi Kakutani