Loading patent…
AssigneeHitachi Chemical Company, Ltd.
InventorsYoshito Ishii, Tatsuya Nishida, Atsushi Fujita, Kazuo Yamada
Estimating the term…
A graphite particle obtained by assembling or binding together a plurality of flat-shaped particles so that the planes of orientation are not parallel to one another, or a graphite particle in which aspect ratio is 5 or less or specific surface area is 8 m2/g or less or the size of crystallite in the direction of c-axis of the crystal is 500 Å or more and the size of crystallite in the direction of plane is 1,000 Å or less as measured by X ray broad angle diffraction, or a graphite particle in which pore volume of the pores having a size falling in a range of 102 to 106 Å is 0.4 to 2.0 cc/g per weight of graphite particle or pore volume of the pores having a size falling in a range of 1×102 to 2×104 Å is 0.08 to 0.4 cc/g per weight of graphite particle is suitable for production of negative electrode of lithium secondary battery, and a lithium secondary battery obtained therefrom is excellent in rapid charge-discharge characteristics, cycle characteristics, etc.
A graphite particle for a negative electrode of a lithium secondary battery, the graphite particle comprising a plurality of portions having planes of orientation not parallel to one another, and having a plurality of pores, wherein an aspect ratio of the graphite particle is 5 or less, wherein a pore volume of pores having a size falling in the range of 102 Å to 106 Å is 0.4 to 2.0 cc/g based on the weight of the graphite particle.
A graphite particle for a negative electrode of a lithium secondary battery, the graphite particle comprising a plurality of portions having panes of orientation not parallel to one another, and having a plurality of pores, wherein an aspect ratio of the graphite particle is 5 or less, wherein a pore volume of pores having a size falling in the range of 1×102 Å to 2×104 Å is 0.08 to 0.4 cc/g based on the weight of the graphite particle.
A graphite particle for a negative electrode of a lithium secondary battery, the graphite particle comprising a plurality of portions having planes of orientation not parallel to one another, and having a plurality of pores, wherein an aspect ratio of the graphite particle is 5 or less, wherein a size Lc of crystallites in a c-axis direction of crystal (002) is 1000 Å or more.
A graphite particle for a negative electrode of a lithium secondary battery, the graphite particle comprising a plurality of portions having planes of orientation not parallel to one another, and having a plurality of pores, wherein an aspect ratio of the graphite particle is 5 or less, wherein a size Lc of crystallites in a c-axis direction of crystal (002) is in a range from 1000 Å to 10000 Å.
Dependencies are inferred from the claim text.