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
Agents for preventing and treating disorders involving modulation of the ryanodine receptors
Wireless control system for a patient support apparatus
Hanger
Managing method and apparatus for servicing contents provided by content provider
Smart television system having methods or means for accessing paid or subscribed digital content from the internet
Method and device for authenticating transmitted user data
Device and method to automatically configure port forwarding
  Randomly Featured Patents
Device for treating malignant, tumorous tissue areas
System and method for maintaining an association for an object
Imaging device and focus detecting method
Popcorn popping machines and associated methods of manufacture and use
Contact spring for vehicular antenna/amplifier connection
Antifungal gypsum board
High temperature cement system
Anchored/resilient hardwood floor system
Container lid
Electronic musical instrument having guitar-like chord selection and keyboard note selection