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Coated carbonaceous particles particularly useful as electrode materials in electrical storage cells, and methods of making the same

A technology of coating particles and carbon particles, which is applied in the direction of alkaline battery electrodes, non-aqueous electrolyte battery electrodes, battery electrodes, etc., can solve the problems of low bulk density, limited electrode density, and difficult processing, and achieve high efficiency and powder flow Good performance and high capacity

Inactive Publication Date: 2005-06-08
PYROTECK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to their irregular nature, these pulverized or milled powdered graphite materials often suffer from low bulk density, which limits the density of electrodes made from them, which also limits the operational performance of rechargeable batteries
Furthermore, processing these pulverized or ground powdered graphite materials into electrodes is difficult due to their irregular nature

Method used

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  • Coated carbonaceous particles particularly useful as electrode materials in electrical storage cells, and methods of making the same
  • Coated carbonaceous particles particularly useful as electrode materials in electrical storage cells, and methods of making the same
  • Coated carbonaceous particles particularly useful as electrode materials in electrical storage cells, and methods of making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Carbon-containing powders were prepared as follows. "Fresh" granular needle coke is first milled with a hammer mill and then ground into a fine powder with a jet mill. Afterwards, the carbonaceous particles obtained by grinding were sieved to remove particles smaller than 1 μm. The particle size of the resulting carbon-containing powder is about 0.5-50 μm, and the average particle size is about 15-20 μm.

[0081] 4g Tetralin® (C 10 h 12 4 g of low-melting petroleum pitch (210°C Mettler softening point, 75% Alcor carbon residue, isotropic petroleum pitch 6 h 4 (C 2 h 3 ) 2 )mix. The contents of the first beaker were gradually added to the second beaker, and after the addition the resulting mixture was heated with continuous stirring and held at 128°C for 15 minutes. The heat was then removed and the mixture was cooled to ambient temperature (approximately 22°C) while maintaining continuous stirring. The resulting solid was removed from the cooled mixture by firs...

Embodiment 2

[0091] Reference Example 1 Another sample of coated carbon-containing powder particles was prepared following the processing steps described above. However, according to this example, 8.5 g Tetralin® (C 10 h 12 ) 8.5 g of the low-melting petroleum pitch described in Example 1 was added to the first laboratory-type beaker. The contents of the second laboratory beaker were kept the same as in Example 1, but the final dry weight of the dried coated powder particles recovered was about 22.3 g. Based on this result, it was determined that the coating on the coated carbonaceous powder particles accounted for about 10% by weight of the total mass of the coated carbonaceous powder particles. These dried particles were then mixed with 9 g of 3.8 wt% sodium nitrate (NaNO 3 ) (A.C.S reagent, sold by J.T. Baker, Inc.) aqueous solution was mixed thoroughly. The mixture was then dried under vacuum at 80°C. The dried mixture was then oxidized and heat treated according to the procedure ...

Embodiment 3

[0094] Reference Example 1 Another sample of coated carbon-containing powder particles was prepared following the processing steps described above. However, according to the example provided, will be added to 10 g Tetralin® (C 10 h 12) of 10 g of the low-melting petroleum pitch described in Example 1 was added to the first laboratory beaker. The contents of the second laboratory beaker were kept the same as in Example 1, but the final dry weight of the dried coated powder particles recovered was about 22.7 g. Based on this result, it was determined that the coating on the coated carbon-containing powder particles accounted for about 12% by weight of the total mass of the coated carbon-containing powder particles. Subsequently, these dry particles were mixed with 9 g of 4.5 wt% sodium nitrate (NaNO 3 ) (A.C.S reagent, sold by J.T. Baker, Inc.) aqueous solution was mixed thoroughly. The mixture was then dried under vacuum at 80°C. The dried mixture was then oxidized and hea...

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Abstract

A method of making coated carbonaceous particles comprising: providing a carbon residue forming material; providing particles of the carbonaceous material; mixing the carbon residue forming material with the particles of the carbonaceous material at an elevated temperature; depositing a coating of carbon residue forming material thereon; and stabilizing the coated particles by subjecting the coated particles to an oxidation reaction. These coated carbon-containing particles are particularly suitable for the production of electrodes in accumulators, especially rechargeable accumulators.

Description

[0001] This application is a continuation-in-part of co-pending Application No. 10 / 066,080 filed January 31,2002. technical field [0002] The invention relates to a graphite material which can be used as a battery electrode. The present invention more particularly relates to coated carbon-containing particles, particularly useful as electrode materials, and to methods of preparing said coated carbon-containing particles. Background of the invention [0003] Carbonaceous materials are widely used in storage batteries (also called "batteries") due to their efficiency and reasonable price. Various forms of carbonaceous materials can be used. Graphite is one such carbonaceous material that is known for use in rechargeable batteries (also known as "rechargeable batteries"). In a typical example, graphite materials are known to be useful as positive electrode materials for rechargeable lithium-ion (Li-ion) batteries. Li-ion batteries are mainly used as power sources for portab...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/04C09C1/44C09C3/00C10C3/02C10C3/10C10C3/14H01B1/00H01C1/00H01G9/04H01G9/042H01M4/02H01M4/08H01M4/13H01M4/133H01M4/1393H01M4/24H01M4/36H01M4/58H01M4/583H01M10/0525H01M10/0569H01M10/36
CPCC04B35/6265C04B35/62802C04B35/62839C04B2235/422C04B2235/425C04B2235/48C04B2235/5276C04B2235/528C04B2235/5292C04B2235/5436C04B2235/5481H01G9/042H01M4/133H01M4/1393H01M4/366H01M4/583H01M10/0525H01M10/0569H01M2004/021C04B35/6264Y02P70/50Y02E60/10
Inventor Z·毛H·E·罗米恩M·W·卡雷尔
Owner PYROTECK INC
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