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
Electrophoretic element and display device
Method and apparatus for supporting delivery, sale and billing of perishable and time-sensitive goods such as newspapers, periodicals and direct marketing and promotional materials
Method and apparatus for coordinating hopping of resources in wireless communication systems
Method of operating an electromechanical converter, a controller and a computer program product
Topology arrangement for achieving reliable communication in wireless automotive networks
Supporting multiple channels of a single interface
Method and system and policy server for guaranteeing data not to be interrupted
  Randomly Featured Patents
Sample desorption/ionization from mesoporous silica
Enhanced data capture from imaged documents
Receiver for disposable surgical implements
Pulverulent copolyamides for the coating of glass bottles
Antenna arrangement for a nuclear magnetic resonance apparatus
Yb-doped fiber laser operating near EDFA absorption band
Differential pressure sensor
Ferrule retainers having access window(s) for accessing and/or referencing a fiber optic ferrule, and related fiber optic connector assemblies, connectors, and referencing methods
Chair arm frame