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
System for assessing an environmental load of building during life cycle
Wall pack light fixture with lens
Method for WLAN localization and location based service supply
Recognition of faces using prior behavior
Method and system for managing recent data in a mobile device linked to an on-demand service
Pergola system
Electro-magnetic interference reduction using opposing field transmitter
  Randomly Featured Patents
Method for managing pages of a designated memory object according to selected memory management policies
Method of making a blade aerofoil for a gas turbine engine
Cloning of complementary DNA encoding maize nitrite reductase
Device for the computer linking of apparatuses with heterogeneous communication systems, and key pertaining to such a device
Biomechanically low load computer mouse
Wall mounted device for supporting articles
Portable lamp
Biopsy apparatus and method
Combined rear window and trunk lid for an automobile
Capacity determination for toner or ink cartridge