Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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 1500.degree. C. or by (2) heat-treating the carbon material pulverized before or after carbonization at a temperature exceeding 1500.degree. 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
Micro-fluidic device
Defect inspection method and device therefor
Request routing based on class
Vending machine
Method and system for prioritizing points of interest for display in a map using category score
Prevention and treatment of oxidative stress disorders by gluthathione and phase II detoxification enzymes
Antimony and germanium complexes useful for CVD/ALD of metal thin films
  Randomly Featured Patents
Shift lever device
Polyurethane resin type composition for slush molding
Method of facilitating a sale of a product and/or a service
Sorting system with multi-plexer
Anti-lock hydraulic control device
Automatic water level monitoring system
Tool storage magazine for machine tool
Search engine inference based virtual assistance
System and method for purification of flue gases
System and method for processing an accelerometer signal to assist in combustion quality control in an internal combustion engine