Aqueous composite binder and method for preparing aqueous positive electrode slurry therefrom

A technology of water-soluble binder and positive electrode slurry, applied in the direction of acid copolymer binder, amide/imide polymer binder, adhesive, etc. The electrode material particles cannot be well contacted, and the irreversible capacity loss increases, so as to achieve the effect of reducing irreversible consumption, superior bonding performance, and ensuring anti-fatigue properties.

Active Publication Date: 2015-12-16
TOP CHEM SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are also the following disadvantages: first, this type of positive electrode material is mostly a semiconductor structure, with low electronic and ionic conductivity; second, the decomposition of lithium salt in the electrolyte causes the dissolution of manganese, and the two items in the dissolution zone gradually become a single structure. , the products of electrolyte decomposition will cause the electrode polarization impedance to increase
Due to the incompatibility of the structures when the two terms coexist, the electrode material particles cannot be in good contact, Li + Diffusion is difficult, polarization increases, resulting in increased irreversible capacity loss, unable to meet the larger charge and discharge current and cycle life of the battery, and the conduction of lithium ions and electrons also depends on the junction between the binder and the active material

Method used

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  • Aqueous composite binder and method for preparing aqueous positive electrode slurry therefrom
  • Aqueous composite binder and method for preparing aqueous positive electrode slurry therefrom
  • Aqueous composite binder and method for preparing aqueous positive electrode slurry therefrom

Examples

Experimental program
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Effect test

Embodiment 1

[0027] [Example 1] Preparation of Positive Electrode

[0028] The water-based composite binder is adopted to include the following components: see Table 1

[0029] water soluble polymer polyvinyl alcohol 65-70 servings Ionic binder lithium carboxymethyl cellulose 30-35 servings flexibilizer Partially Hydrolyzed Polyacrylamide 1.5 servings

[0030] Table 1

[0031] The water-based positive electrode slurry prepared by the water-based composite binder includes the following components: see Table 2

[0032] water-based composite binder 8 servings Conductive agent acetylene black 10 copies Cathode material 82 copies Deionized water 200-250 copies

[0033] Table 2

[0034] Among the above water-based composite binders, partially hydrolyzed polyacrylamide is prepared by the following method: dissolve polyacrylamide in water, add lithium hydroxide, heat to 40-90°C, stir for 2-8 hours, cool to room temperature...

Embodiment 6

[0052] [Example 6] The method steps are the same as above, the difference is that the composite binder is composed of polyacrylamide, polyethylene glycol, lithium silicate aqueous solution, and the active material is LiMn 2 o 4 , the ratio of binder, conductive agent and active material is 7:10:83.

[0053] [Example 7] The method steps are the same as above, except that the composite binder is composed of polyacrylamide, polyvinyl alcohol, lithium carboxymethyl cellulose, and the active material is LiMn 2 o 4 , the ratio of binder, conductive agent and active material is 7:10:83.

Embodiment 8

[0054] [Example 8] The method steps are the same as above, except that the composite binder is composed of polyvinyl alcohol, carboxymethyl chitosan, lithium silicate aqueous solution, and the active material is LiMn 2 o 4 , the ratio of binder, conductive agent and active material is 7:10:83.

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Abstract

The invention provides an aqueous composite binder and a method for preparing aqueous positive electrode slurry therefrom. The aqueous composite binder is prepared through blending the ingredients in parts by mass: 65-70 parts of primary binder, 30-35 parts of ionic binder and 1.5 parts of flexibilizer, wherein a -COOLi functional group containing water-soluble polymer, or water-soluble lithium-containing silicate or a water-soluble binder capable of forming a complex with free Li<+> serves as the ionic binder, a long-chain water-soluble polymer with adsorption and flocculation effects serves as the flexibilizer, and a water-soluble polymer serves as the primary binder. The aqueous composite binder and the method for preparing the aqueous positive electrode slurry therefrom have the advantages that the problem that Mn is dissolved in a cycle process of spinel lithium manganate batteries can be effectively solved, and prepared batteries are more environment-friendly and are better in charging and discharging properties.

Description

technical field [0001] The invention relates to the fields of material chemistry and new energy, in particular to a water-based composite binder and a preparation method thereof, and the application of the water-based composite binder prepared by the method to the preparation of lithium-ion battery cathode sheets. Background technique [0002] Lithium-ion batteries, as the pioneer of the contemporary battery industry, are mainly used in rechargeable batteries for portable electronic products, power tools and electric vehicles. The domestic and foreign electric vehicle markets continue to expand, and the demand for lithium-ion batteries will also continue to grow. The preparation of lithium-ion batteries requires an auxiliary material binder, which is also an important factor affecting the composition of the battery and its overall performance. Manganese-based cathode material is an earlier researched lithium battery cathode material. It has the advantages of low price, good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J129/04C09J101/28C09J133/02C09J171/02C09J1/02C09J133/26C09J139/06H01M4/62H01M4/505H01M10/0525
CPCY02E60/10
Inventor 李国富
Owner TOP CHEM SHENZHEN CO LTD
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