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
Automatic baroreflex modulation responsive to adverse event
Active constant power supply apparatus
Synchronization of communication equipment
Method and system for distributing load by redirecting traffic
Motion blur reduction for LCD video/graphics processors
Watch chain
Reframing circuitry with virtual container drop and insert functionality to support circuit emulation protocols
  Randomly Featured Patents
Image duplicating apparatus in which user specified operational conditions are stored and used based on the detected nature of the document being copied
Monoradioiodinated phenolic esters, acids and amines
Substrate supporting/transferring tray
Process for purifying 2-acrylamido-2-methylpropanesulfonic acid
Self-propelling projectile for firearms
Flexographic ink feeding apparatus
Telephoto camera lens
Track for toy vehicles
Device for detecting tightness of the link between a sealed assembly of two chambers insulated from outside environment
Prime power source and control for a guided projectile