Patent ID: 7172837
Filing Date: 2007-02-06
Classification: H01M,Y02E

Abstract:
1. A nonaqueous electrolyte secondary battery comprising: a positive electrode comprising a positive-electrode active material; a negative electrode comprising a particulate negative-electrode active material, said positive-electrode active material and said negative-electrode active material being capable of intercalating/deintercalating lithium; and a nonaqueous electrolyte solution; wherein said negative electrode further comprises carbon fibers and carbon flakes disposed in the interstices between said particulate negative electrode active material; wherein the ratio by weight of said carbon flakes to said carbon fibers in said negative electrode is in a range of 0.2 to 100; wherein said carbon fibers are produced by vapor phase deposition and said carbon fibers have an average diameter of 0.01 to 1 μm and an average length of 1 to 100 μm; and wherein said carbon flakes have a (002) interplanar spacing of less than 0.3360 nm by X-ray diffractometry and a thickness of (002) c-axis crystallites of 100 nm or more and the bulk density of said carbon flakes, as measured by Japanese Industrial Standard K-1469, is 0.4 g/cm