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Electrode thickener and negative electrode slurry using same

A negative electrode slurry and thickener technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of affecting the quality of finished electrodes, the decrease of dispersion and uniformity of negative active materials, and the deterioration of lithium ion movement conditions, etc.

Active Publication Date: 2022-05-03
远景动力技术(湖北)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the continuous improvement of lithium-ion battery materials, the particle size of the negative electrode active material is getting smaller and smaller. Although this improves the performance of lithium-ion batteries, it is easy to form secondary aggregates, which makes the negative electrode active material in the negative electrode slurry. The uniformity decreases, and the movement conditions of lithium ions inside the battery become worse, which in turn reduces the charging and discharging efficiency of the battery
If the plasma viscosity is reduced, although the formation of secondary aggregates can be alleviated, it will affect the quality of the finished electrode and reduce the service life of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Dissolve 8 parts of carboxymethyl cellulose lithium powder in 563 parts of deionized water to make carboxymethyl cellulose lithium glue, then add 1 part of glycerol and stir to make 572 parts of electrode thickener.

Embodiment 2

[0048] Dissolve 8 parts of carboxymethylcellulose lithium powder in 563 parts of deionized water to make carboxymethylcellulose lithium glue, then add 1 part of N-methylpyrrolidone and stir to make 572 parts of electrode thickener.

[0049] Preparation of negative electrode slurry

Embodiment 3

[0051] 572 parts of electrode thickener prepared in Example 1 were mixed with 8 parts of conductive agent to form 580 parts of conductive glue. Mix 580 parts of conductive adhesive with 966 parts of graphite and stir for 60 minutes (revolution 20rpm, rotation 800rpm) to form a slurry, then add 300 parts of deionized water to reduce the solid content to about 53%, and continue stirring for 90 minutes (revolution 35rpm, rotation 2500rpm, vacuum degree -90kPa), and finally add 45 parts of SBR emulsion and stir for 30min (revolution 20rpm, rotation 800rpm, vacuum degree -90kPa), mix well to make negative electrode slurry.

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PUM

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Abstract

The application discloses an electrode thickener and a negative electrode slurry using the thickener. In this application, the electrode thickener includes: deionized water; carboxymethyl cellulose salt and organic solvent, the presence of organic solvent is conducive to the formation of a network structure of carboxymethyl cellulose salt, thereby making the negative electrode active in the negative electrode slurry The material is easy to disperse, and under the condition of constant bonding strength, the kinetic conditions of the electrode are improved, which is beneficial to the conduction of lithium ions, and the electrochemical performance, especially the charge and discharge efficiency, of lithium ion batteries using it is significantly improved.

Description

technical field [0001] The embodiments of the present invention relate to the field of lithium ion batteries, in particular to electrode thickeners and negative electrode pastes using the same. Background technique [0002] The negative electrode slurry of lithium-ion batteries is mainly composed of negative electrode active materials, conductive agents, and binders. During the charging and discharging process, lithium ions intercalate and deintercalate back and forth between the two electrodes: during charging, lithium ions are deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. The dispersion and uniformity of the negative electrode active material in the negative electrode slurry directly affect the movement of lithium ions between the two electrodes of the battery, thereby affecting the efficiency of charging and discharging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M10/0525Y02E60/10
Inventor 魏迪锋李昊孙化雨
Owner 远景动力技术(湖北)有限公司