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Lithium battery current collector and preparation method thereof

A current collector and lithium battery technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve problems such as reducing battery energy density, and achieve the effects of improving adhesion, cycle life and rate performance

Active Publication Date: 2019-04-02
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can reduce the internal resistance of the pole piece to a certain extent, improve the cycle performance, and increase the battery rate performance, but coating a layer of 5-10 μm conductive adhesive layer on the current collector will reduce the energy density of the battery

Method used

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  • Lithium battery current collector and preparation method thereof

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preparation example Construction

[0021] The preparation method of the new lithium battery current collector is: dispersing the chelating agent in a solvent to prepare a chelating agent dispersion liquid, and then coating the dispersion liquid on at least one surface of the metal foil, and heat-treating to obtain a new lithium battery current collector. fluid;

[0022] The chelating agent is citric acid (CA) and its sodium salt, tartaric acid (TA) and its sodium salt, gluconic acid (GA) and its sodium salt, ethylenediaminetetraacetic acid (EDTA) and its sodium salt, aminotriacetic acid (NTA) and its sodium salt, diethylenetriaminepentaacetic acid and its sodium salt, hydroxyethylethylenediaminetriacetic acid (HEDTA) and its sodium salt, dihydroxyethylglycine (DEG), aminotrimethylene phosphine acid (ATMP), ethylenediaminetetramethylenephosphonic acid (EDTMP), hydroxyethylidenediphosphonic acid (HEDP), diethylenetriaminepentamethylenephosphonic acid (DTPMP), 1,2-dimethyl-3- One or more of hydroxy-4-pyridone (DH...

Embodiment 1

[0039] Disperse 1,2-dimethyl-3-hydroxy-4-pyridone chelating agent in N-methylpyrrolidone solvent to prepare a 0.5mol / L chelating agent dispersion, which is applied to aluminum foil by spraying On the two surfaces of the chelating agent layer, the single-sided surface density of the chelating agent layer is 0.5 mg / cm after heat treatment at 90 ° C for 30 min 2 new collectors. The positive electrode slurry is coated on the new current collector, and the desired positive electrode sheet is obtained through heat treatment and rolling treatment.

Embodiment 2

[0041] Disperse the ethylenediaminetetraacetic acid chelating agent in a water solvent to prepare a 0.5mol / L chelating agent dispersion, apply it to the two surfaces of the copper foil by spraying, and heat-treat at 65°C for 30 minutes to obtain the chelating agent The density of one side of the mixture layer is 0.5mg / cm 2 new collectors. The negative electrode slurry is coated on the new current collector, and the desired negative electrode sheet is obtained through heat treatment and rolling treatment.

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Abstract

The invention discloses a lithium battery current collector and a preparation method thereof. The lithium battery current collector comprises a metal foil and a chelating agent layer which is coated on at least one surface of the metal foil; the specific preparation method of the novel current collector comprises the following steps of dispersing the chelating agent in a solvent to prepare a chelating agent dispersion liquid, and then coating the dispersion liquid on at least one surface of the metal foil, and carrying out heat treatment to prepare the novel lithium battery current collector;the chelating agent has a carboxyl group, an amino group and other functional groups, and can interact with a carboxyl group or a hydroxyl functional group on the surface of a binder and the surface of an active substance, and meanwhile, a relatively strong complexting effect is achieved between the chelating agent and the foil material metal surface (residual metal ions), so that the effect of the binder is achieved; a small amount of chelating agent is coated on the surface of the metal foil, so that the bonding force between the electrode slurry and the current collector foil can be greatlyimproved, and the cycle life and the rate performance of the battery can be prolonged and improved under the condition that the energy density of the battery is kept unchanged.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a lithium battery current collector and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become the main energy source for communication electronic products due to their advantages such as clean and environmentally friendly, high energy density, stable discharge voltage, and good cycle performance. In recent years, lithium-ion batteries are considered to be one of the most promising forms of new energy power, and scientists from various countries are constantly working on the development and research of more practical and effective lithium-ion batteries. People's demand for large-capacity and high-power batteries is becoming more and more urgent, especially the requirements for automotive power batteries are getting higher and higher. To meet the requirements of vehicles, the cycle, rate, and safety performance of batteries are particular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66C23C14/12
CPCC23C14/12H01M4/661H01M4/667Y02E60/10
Inventor 袁丽只邵乐田占元胡朝文冯皓郑勇
Owner SHAANXI COAL & CHEM TECH INST
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