Battery electrode paste compound containing modified maleimide

A technology of maleimide and bismaleimide, applied in the field of electrode slurry composition of lithium battery, can solve problems such as sedimentation

Active Publication Date: 2008-07-02
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the positive electrode slurry composition for making the positive electrode surface coating film contains high-density lithium cobalt oxide (LiCoO 2 ) and other metal oxide powders of positive electrode active materials, and low-density carbon powder and graphite, under the mixing and dispersion of electrode binder polyvinyl difluoride (PVDF) and solvent N-methylpyrrolidone (NMP), it is easy to cause sedimentation (sedimentation) phenomenon

Method used

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  • Battery electrode paste compound containing modified maleimide
  • Battery electrode paste compound containing modified maleimide
  • Battery electrode paste compound containing modified maleimide

Examples

Experimental program
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Effect test

Synthetic example 1

[0032] Synthesis Example 1: Preparation of Modified Bismaleimide Dispersant

[0033] The reactants N, N'-4,4'-diphenylmethane-bismaleimide and barbituric acid (molar ratio 10:1) were placed in the reaction vessel, and then the propenyl carbonate solvent was added to the reaction In the container, the weight ratio of the reactant to the propylene carbonate solvent is 20:80. After mixing, the mixture was heated to 130° C. for 3 hours to obtain a modified maleimide dispersant.

preparation example 1

[0034] Preparation Example 1: Preparation of Positive Plate Slurry

[0035] 1820 grams of lithium cobalt oxide (LiCoO 2 ), 120 grams of KS4, 60 grams of polyvinyl difluoride (PVDF) and 850 grams of N-methylpyrrolidone were placed in a three-dimensional space mixer (3D Mixer). Next, the modified maleimide obtained in Synthesis Example 1 was added into the three-dimensional space mixer (3D Mixer) in an amount of 0.4% by weight of the total solid content of the slurry. Finally, the quantitative standard was added and mixed with the beads and mixed for 2.5 hours, and the mixture was poured out, and the beads were filtered to obtain the slurry sample 1 of the positive electrode.

preparation example 2

[0036] Preparation Example 2: Preparation of Positive Plate Slurry (Control Group)

[0037] 1820 grams of lithium cobalt oxide (LiCoO 2 ), 120 grams of KS4, 60 grams of polyvinyl difluoride (PVDF) and 850 grams of N-methylpyrrolidone were placed in a three-dimensional space mixer (3D Mixer). Next, add the quantitative standard and mix the beads and mix for 2.5 hours, pour out the mixture, filter the beads, and obtain the slurry sample 2 of the positive electrode.

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Abstract

The invention discloses an electrode paste compound of a battery containing modified maleimide, which comprises electrode active material, conductive additive, agglutinate and modified maleimide dispersing agent. The modified maleimide acting as the dispersing agent in the compound has a dendrimer-like hyperbranched structure and can form a stable complex compound with the electrode active material such as metal oxide, improve the dispersion of the paste solution, reduce the viscosity of the paste, and maintain the stability of the viscosity for a long term. Besides, due to excellent compatibility of the modified maleimide and the electrode paste solvent, the stability in storing the paste can be improved. In addition, through stable bonds formed by the modified maleimide and a current collecting substrate of the electrode, the adhesive force between an electrode membrane and the current collecting substrate can be increased, and the cycle life of the battery product can be prolonged.

Description

technical field [0001] The invention relates to a battery electrode slurry composition, in particular to an electrode slurry composition for a lithium battery. Background technique [0002] In recent years, 3C electronic products, such as notebook computers, foldable mobile phones, digital cameras and video cameras, have been developing in the direction of light, thin, short and small, which has become the trend of electronic technology and communication products. Provider "Secondary Battery" demand. In contrast, the demand and specifications of secondary batteries are also developing towards thinner, smaller size and lighter weight. At the same time, in order to meet the requirements of diversified functions, high speed, high performance and high power of electronic products, the demand for capacitors of secondary batteries is also gradually increasing. [0003] Generally speaking, the energy density of lithium-ion batteries is about 260 to 270kWh / m 3 , about twice or ev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C09J133/02C09J125/08H01M4/58H01M4/48
CPCY02E60/10
Inventor 杨长荣潘金平陈建安许荣木
Owner IND TECH RES INST
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