Resources Contact Us Home
Graphite powders suited for negative electrode material of lithium ion secondary battery

Image Number 4 for United States Patent #7214447.

A graphite powder suitable for a negative electrode material of a lithium ion secondary battery which assures a high discharging capacity not lower than 320 mAh/g is to be manufactured at a lower cost. Specifically, a graphite powder containing 0.01 to 5.0 wt % of boron and having a looped closure structure at an end of a graphite c-planar layer on the surface of a powder, with the density of the interstitial planar sections between neighboring closure structures being not less than 100/.mu.m and not more than 1500/.mu.m, and with d002 being preferably not larger than 3.3650 .ANG., is manufactured by (1) heat-treating a carbon material pulverized at an elevated speed before or after carbonization for graphization at temperature exceeding C. or by (2) heat-treating the carbon material pulverized before or after carbonization at a temperature exceeding C. forgraphization and subsequently further heat-treating the graphized material at a temperature exceeding a temperature of the oxidating heat treatment and the heat treatment in the inert gas.

  Recently Added Patents
High performance adaptive switched LED driver
Electronic device and printed circuit board
Pre-sealing unit for wire-cut electric discharge machine
Agents for preventing and treating disorders involving modulation of the ryanodine receptors
Sign language keyboard and sign language searching apparatus using the same
Image processing apparatus, image registering method, program causing computer to execute image registering method, and recording medium in which program is recorded
Predictive time entry for workforce management systems
  Randomly Featured Patents
Method of identifying pattern in a series of data
Method for genetic immunization
Method of contacting catalyst particles with gas and liquid
Filtering apparatus
Electronic equipment provided with wiring board into which press-fit terminals are press-fitted
Illuminated switch unit
Process for the production of a porous film having high bursting strength
Vacuum draft submerged combustion separation system
Juvenile seat with adjustable automatic locking barrier