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
Switchable memory diodes based on ferroelectric/conjugated polymer heterostructures and/or their composites
Light-emitting diode package and method for manufacturing the same
Cellulose acylate laminate film, method for producing cellulose acylate laminate film, polarizer and liquid crystal display device
Support member, rotation device comprising such a support and rolling bearing assembly including such a detection device
Idle stop and go system and method for controlling thereof
Display screen or portion thereof with icon
Hand mixer
  Randomly Featured Patents
Stairlift
High temperature oxidation/corrosion resistant coatings
Methods and apparatus for downlink macro-diversity in cellular networks
Cartridge for spraying a liquid into the barrel of a firearm
Keypad with optical waveguide having at least one prism pattern
Method and system for notification of local action required to contents of electronic mail message
Semiconductor integrated circuit manufacturing method and model parameter extracting method, apparatus, and program
Paper structures having at least three regions including decorative indicia comprising low basis weight regions
Adapter device for adapting a worm gear
Electronic circuit and communication system