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Composite electrode material

a technology of electrode material and composite material, which is applied in the direction of electrochemical generators, cell components, transportation and packaging, etc., can solve problems such as side reactions, and achieve the effect of lowering the viscosity of the mixtur

Active Publication Date: 2011-11-03
RESONAC CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The approach results in high mechanical strength, improved ionic conductivity, and increased discharge capacity at high and low temperatures, with reduced resistance and irreversible capacity loss, making it suitable for high-power applications without the need for additional carbon sources.

Problems solved by technology

However, using steel balls introduces impurities on the cathode material which leads to side reactions.

Method used

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  • Composite electrode material
  • Composite electrode material
  • Composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0046] 300 g of C-LiFePO4 and 9 g of VGCF™ were mixed in a Nobilta® grinder for 5 minutes. Then 16.25 g of PVDF (representing 5% of the total weight of LiFePO4, VGCF™ and PVDF) dissolved in NMP were added and the slurry obtained was coated on a polypropylene sheet. After elimination of NMP by evaporation, the resistance measured on the coating is 7 Ω.cm.

example 2

[0049] 300 g of C-LiFePO4 and 9 g of VGCF™ were mixed in a Mechanofusion® grinder for 30 minutes. Then 16.25 g of PVDF (representing 5% of the total weight of LiFePO4, VGCF™ and PVDF) dissolved in NMP were added and the slurry obtained was coated on a polypropylene sheet. After elimination of NMP, the resistance measured on the coating is 8 Ω.cm.

example 4

[0054] 300 g of C-LiFePO4 and 9 g of VGCF™ were mixed in a Mechanofusion® grinder for 30 minutes. Then 17.98 g of SBR (representing 5.5% of the total weight of LiFePO4, VGCF™ and SBR) dissolved in water were added and the slurry obtained was coated on an aluminum collector. After elimination of water, the rate of composite material on the collector is 10 mg / cm2. The electrode thus obtained was immersed in propylene carbonate (PC).

[0055] Further samples were prepared according to the same procedure, using acetylene black instead of VGCF™, and then adding no carbon.

[0056]FIG. 3 represents the time T (in seconds) as a function of the electrode density D (g / cm3). “Electrode density” D means the weight per volume unit of electrode material, the electrode material comprising the complex oxide, the added carbon (carbon fiber or acetylene black) if any, and absorbed PC if any. Time T represents the time for complete absorption of 3 μL of PC.

[0057]♦ corresponds to the sample without carbo...

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Abstract

The invention relates to a composite electrode material consisting of a carbon coated complex oxide, fibrous carbon and a binder. Said material is prepared by a method which comprises 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.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a composite electrode material and to a method for the preparation thereof. BACKGROUND [0002] It is known to use composite electrodes in lithium batteries, wherein the composite electrode material comprises a complex oxide as the active material, a carbonaceous material as the electronic conducting and a binder. [0003] U.S. Pat. No. 5,521,026 (Brochu et al.) discloses a battery wherein the electrolyte is a solid polymer electrolyte, the anode is a lithium anode, and the cathode comprises a mixture of V205 and carbon black on a current collector. The composite cathode material is obtained by ball-milling the oxide and the carbon black in a liquid solvent, using stainless steel balls. Performances of such a battery are improved by ball-milling compared to a battery wherein the cathode components are simply mixed. However, using steel balls introduces impurities on the cathode material which leads to side reactions. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/583H01M4/58H01M10/36
CPCH01M10/052H01M4/485H01M2004/028Y02E60/122Y02T10/7011H01M4/02H01M4/136H01M4/1393H01M4/1397H01M4/366H01M4/5825H01M4/623H01M4/625H01M4/131H01M2004/021H01M4/583H01M4/621H01B1/20Y02E60/10H01M4/00H01M4/04H01M4/48
Inventor ZAGHIB, KARIMSOTOWA, CHIAKICHAREST, PATRICKTAKEUCHI, MASATAKAGUERFI, ABDELBAST
Owner RESONAC CORPORATION