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Lithium battery current collector and preparing method thereof

A current collector and lithium battery technology, which is applied in the direction of battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problem of expansion and separation of active materials and current collectors, the impact of cycle life battery safety performance, and poor application of electrode materials, etc. Problems, to achieve the effect of high power characteristics, strong adhesion, and strong force

Inactive Publication Date: 2016-08-03
INST OF NEW ENERGY SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a preparation method has the following problems: First, there are certain problems in the matching of the work function of the direct contact between the electrode active material and the current collector as a semiconductor material, resulting in an increase in resistance, which is harmful to battery performance, especially under high current charge and discharge conditions. Second, the bond strength of the binder is limited. During the continuous charging and discharging process, it is easy to cause the expansion and separation between the active material and the current collector, which will further increase the internal resistance of the battery and make the cycle The life and safety performance of the battery is affected
This method has a certain effect, but it is only effective for some electrode materials and has a certain selectivity, which is not suitable for all electrode materials.

Method used

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  • Lithium battery current collector and preparing method thereof

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preparation example Construction

[0025] Correspondingly, the embodiment of the present invention also provides a preparation method of a lithium battery current collector, comprising the following steps:

[0026] S01. Disperse the coating powder and the binder in a solvent to form an inert buffer slurry, wherein the coating powder includes at least one of metal nitride and metal carbide;

[0027] S02. Coating the inert buffer slurry on at least one surface of the current collector foil to form a coating of the inert buffer slurry;

[0028] S03. Drying treatment.

[0029] Specifically, in the above step S01, in the embodiment of the present invention, the coating powder and the binder are the coating powder and the binder mentioned in the lithium battery current collector, wherein the coating powder includes At least one of metal nitride and metal carbide. Preferably, the solvent is water, a mixed solvent of water and ethanol or N-methylpyrrolidone. The coating powder and the binder are dispersed in a solve...

Embodiment 1

[0037] Weigh 8 g of TiN powder with a particle size of 50 nm and add it to 500 g of nitrogen methyl pyrrolidone for 8 hours, then ultrasonically disperse for 10 minutes, and the ultrasonic frequency is 15KHz; weigh 1.5 g of polyvinylidene fluoride and add it to 1000 g of nitrogen methyl pyrrolidone. The mixer mixed evenly, then added 508g of TiN slurry after ultrasonic dispersion, stirred and mixed evenly, added 1500g of nitrogen methyl pyrrolidone to adjust the viscosity of the slurry, and the viscosity was controlled to 1000mPa.s; the slurry was uniformly coated by a transfer coater On the surface of aluminum foil, and dried in a blast drying oven to obtain a conductive coating with a single-sided coating thickness of 3 μm.

[0038] The peel strength of the current collector prepared above was measured by a peel strength tester to be 0.45N, and the resistivity of the pole piece was measured by a four-point probe method to be 2.362×10 -6 ohm.cm.

Embodiment 2

[0040] Weigh 8 g of TiN powder with a particle size of 1 μm and add it to 500 g of nitrogen methyl pyrrolidone for 8 hours, then ultrasonically disperse for 10 minutes, and the ultrasonic frequency is 15KHz; weigh 1.5 g of polyvinylidene fluoride and add it to 1000 g of nitrogen methyl pyrrolidone. The mixer mixed evenly, then added 508g of TiN slurry after ultrasonic dispersion, stirred and mixed evenly, added 1500g of nitrogen methyl pyrrolidone to adjust the viscosity of the slurry, and the viscosity was controlled to 1000mPa.s; the slurry was uniformly coated by a transfer coater On the surface of aluminum foil, and dried in a blast drying oven to obtain a conductive coating with a single-sided coating thickness of 3 μm.

[0041] The peel strength of the current collector prepared above was measured by a peel strength tester to be 0.26N, and the resistivity of the pole piece was measured by a four-point probe method to be 5.362×10 -6 ohm.cm.

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Abstract

The invention belongs to the field of lithium batteries, and provides a lithium battery current collector and a preparing method thereof. The lithium battery current collector comprises current collector foil and inert buffer layers applied to at least one surface of the current collector foil. Each inert buffer layer comprises coating powder and a binder, wherein the coating powder comprises at least one of metal nitride and metal carbide. The preparing method comprises the steps of dispersing the coating powder and the binder in a solvent to form inert buffer size, applying the inert buffer size to at least one surface of the current collector foil to form an inert buffer size coating, and conducting drying treatment.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a lithium battery current collector and a preparation method thereof. Background technique [0002] As a high-capacity, long-life energy storage system, lithium secondary batteries have been widely used in small portable electronic products, especially in the field of mobile phones and 3C electronic consumer products. The application prospects in power batteries and large-capacity energy storage batteries have attracted the attention of the world. The research and development of high-performance lithium-ion batteries is an important task in the field of electrochemical energy storage. [0003] In a lithium secondary battery, the active material is uniformly coated on the surface of the aluminum foil or copper foil current collector, and the current collector undergoes an electrochemical reaction through physical contact with the active material and generates electron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01M4/66
CPCH01M4/64H01M4/66H01M4/667Y02E60/10
Inventor 张全生解晶莹茆胜
Owner INST OF NEW ENERGY SHENZHEN
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