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
Solid-state image capture device and image capture apparatus
Non-volatile semiconductor memory and data processing method in non-volatile semiconductor memory
Position-measuring device
Toothbrush holder
System and method for managing a loyalty program via an association network infrastructure
Light emitting device and light emitting device package
Nonvolatile semiconductor memory device and method for controlling the same
  Randomly Featured Patents
Mechanical seal
Premixed secondary fuel nozzle with integral swirler
Stairway platform
Anthraquinone-azomethine compounds, processes for their preparation and processes for dyeing synthetic fibre materials and for pigmenting organic macromolecular substances
Eyeglasses
Spring-force clamp connector for an electrical conductor
Disk film optical measurement system
High-pressure discharge lamp
Latch apparatus
Method for managing power in a simultaneous multithread processor by loading instructions into pipeline circuit during select times based on clock signal frequency and selected power mode