Composite electrode material

Patent metadata

Field	Value
Publication number	US-9905839-B2
Application number	US-201414149443-A
Country	US
Kind code	B2
Filing date	Jan 7, 2014
Priority date	Feb 28, 2008
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A composite electrode material consisting of a carbon coated complex oxide, fibrous carbon and a binder. Said material is prepared by a method which includes co-grinding an active electrode material and fibrous carbon, and adding a binder to the co-grinded mixture to lower the viscosity of the mixture. The fibrous carbon is preferably vapor grown carbon fibers.

First claim

The invention claimed is:

1. An electrode comprising a composite electrode material on a current collector, said composite electrode material consisting of carbon coated oxide nanoparticles, fibrous carbon and a binder, wherein:
the fibrous carbon comprises vapor grown carbon fibers, each of which comprises fiber filaments, said filaments having a diameter of 5 to 500 nm and an aspect ratio (length/diameter) of 20 to 10000;
the carbon coating on the oxide nanoparticles is obtained by pyrolysis of a carbonaceous material and the fibrous carbon is bonded to the carbon coating via carbon-carbon chemical bonding;
the composite material consists of 0.5-5 wt % vapor grown carbon fibers, 70-95 wt % oxide nanoparticles and 1-25 wt % polymer binder, the total being 100%.

2. The electrode according to claim 1 , wherein the oxide nanoparticles are selected from the group consisting of sulfate, phosphate, silicate, oxysulfate, oxyphosphate or oxysilicate of a transition metal and lithium, and a mixture thereof.

3. The electrode according to claim 1 , wherein the oxide nanoparticles are selected from the group consisting of LiFePO 4 , LiMnPO 4 , LiFeSiO 4 , SiO, and SiO 2 .

4. The electrode according to claim 1 , wherein the binder is selected from the group consisting of PVDF, PTFE, styrene butadiene rubber SBR, and natural rubber.

Assignees

• Hydro Quebec
• Showa Denko Kk

Inventors

• Zaghib Karim
• Sotowa Chiaki
• Charest Patrick
• Takeuchi Masataka
• Guerfi Abdelbast

Classifications

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/00

  Electrodes · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M4/623

  fluorinated polymers · CPC title