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Electrodes including novel binders and methods of making and using the same

A technology of binder and electrode composition, which is applied in the direction of electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve the problem of irreversible loss of battery capacity, and achieve the reduction of irreversible capacity and attenuation, and the loss of irreversible capacity in the first cycle Effect of reducing and improving cycle life

Inactive Publication Date: 2010-03-03
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in the so-called irreversible loss of battery capacity

Method used

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  • Electrodes including novel binders and methods of making and using the same
  • Electrodes including novel binders and methods of making and using the same
  • Electrodes including novel binders and methods of making and using the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0072] Preparation Example 1-Preparation of Si 70 Fe 10 Ti 10 C 10 alloy

[0073] Si 70 Fe 10 Ti 10 The preparation was as follows: silicon block (65.461 g) (Alfa Aesar / 99.999%, Ward Hill, MS), iron sheet (18.596 g) (Alfa Aesar / 99.97%) and titanium sponge (15.943 g) (Alfa Aesar / 99.97%) were melted in an electric arc furnace. / 99.7%). Si 70 Fe 10 Ti 10 The alloy ingot was broken into small pieces and processed in a hammer mill to prepare alloy powder particles having an average particle size of 150 μm.

[0074] by (above) Si 70 Fe 10 Ti 10 Alloy powder and graphite (TIMREX SFG44, TimCal GmbH, Baudio, Switzerland), prepared Si by reactive ball milling in a high dynamic ball mill (SIMOLOYER, CM20-201m, Zoz GmbH, Wenden, Germany) 70 Fe 10 Ti 10 C 10 alloy. Si 70 Fe 10 Ti 10 1.4423kg of alloy powder samples, 0.0577kg of graphite and 25kg of chromium steel balls with a diameter of 4.76mm are loaded into the mill. The grinder was run for 180 cyc...

preparation example 2-S

[0075] Preparation 2-Si 66.4 Fe 11.2 Ti 11.2 C 11.2 Alloy powder

[0076] Si 74.8 Fe 12.6 Ti 12.6 The alloy composition was prepared as follows: silicon block (123.31 g) (Alfa Aesar / 99.999%, Ward Hill, MS), iron sheet (41.29 g) (Alfa Aesar / 99.97%) and titanium sponge (35.40 g) were melted in an electric arc furnace. ) (Alfa Aesar / 99.7%). The alloy ingot was broken into small pieces and processed in a hammer mill to produce alloy powder particles of approximately 150 μm.

[0077] by Si 74.8 Fe 12.6 Ti 12.6 Alloy powder (2.872 g) and graphite (0.128 g) (TIMREXSFG44, TimCal Ltd., Bodio, Switzerland) were processed in a Spex mill with sixteen tungsten carbide balls (3.2 mm diameter) (USA, NJ) under an argon atmosphere. Si was prepared by reactive ball milling in Tuchen's SpexCERTIPREP Group for one hour 66.4 Fe 11.2 Ti 11.2 C 11.2 .

preparation example 3

[0078] Preparation example 3-preparation of lithium polyacrylate

[0079] Lithium polyacrylate was prepared by adding an aqueous lithium hydroxide solution to an aqueous poly(acrylic acid) solution. Different molar ratios were used for lithium hydroxide to carboxylic acid groups. Typically, a 20% by weight lithium hydroxide aqueous solution and a 34% by weight poly(acrylic acid) aqueous solution are used. Deionized water was added to bring the final lithium polyacrylate solution to 10% solids by weight. Poly(acrylic acid) at 100,000 (Mw) and 250,000 (Mw) was obtained as an aqueous solution from Aldrich Chemical Company, Milwaukee, Wisconsin. A 65% by weight lithium polyacrylate sample neutralized by LiOH was prepared by adding 185.56 g of deionized water, 60.41 g of a 20% by weight lithium hydroxide solution, and 100 g of a poly(acrylic acid) (PAA) solution (34% by weight in water) to give 100,000Mw and 250,000Mw. The result was a 64% neutralized lithium polyacrylate sol...

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Abstract

Provided are electrode compositions for lithium-ion electrochemical cells that include novel binders. The novel binders include lithium polysalts of carboxylic and sulfonic acids, lithium salts of copolymers of acids, lithium polysulfonate fluoropolymers, a cured phenolic resin, cured glucose, and combinations thereof.

Description

[0001] Related Patent Applications [0002] This application claims U.S. Utility Model Serial No. 11 / 671,601 filed February 6, 2007 and Serial Nos. 60 / 911,877, 60 / 911,878 and Priority to U.S. Provisional Application No. 60 / 911,879, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention provides electrode compositions for lithium ion electrochemical cells comprising novel binders, and batteries comprising electrodes made from these compositions. Background technique [0004] Powdered alloys of main group elements and conductive powders such as carbon black have been used to prepare electrodes for lithium-ion batteries by combining the powdered active ingredient with a polymeric binder such as polyvinylidene fluoride mix. The mixed ingredients are made into a dispersion in a solvent for the polymeric binder and coated onto a metal foil substrate or current collector. The resulting composite electrode comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/134H01M4/1395H01M4/52H01M4/525H01M10/0525H01M10/36
CPCY02E60/122H01M4/525H01M4/621H01M10/0525H01M4/1395H01M4/38H01M4/134H01M4/0404H01M4/364H01M4/386H01M4/387H01M4/583H01M4/622Y10T29/49115Y02E60/10
Inventor 帕·T·范黎丁巴
Owner 3M INNOVATIVE PROPERTIES CO
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