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Current collector and preparation method and application thereof

A technology of current collector and liquid crystal polymer, applied in the direction of electrode carrier/current collector, etc., can solve the problems of small mass per unit area, problems of battery safety, reduction of battery energy density, etc., so as to increase the content of active substances and reduce internal short circuits. Risk, the effect of alleviating heat shrinkage

Pending Publication Date: 2022-07-29
上海飞鸿创联新能源发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Metal foil has good electrical conductivity, but the machining performance is poor at the above-mentioned thickness. Leakage current not only affects the performance efficiency of the entire battery, but may even cause serious safety problems
In addition, the mass per unit area of ​​metal foil is relatively large. Traditional copper foil and aluminum foil account for 15-20% of the entire battery mass, which is the heaviest part of the battery except for the positive and negative electrode materials, which will lead to a decrease in the energy density of the battery.
[0004] In view of the above problems, the Chinese patent with the publication number CN106898729A discloses a current collector based on a polymer-based textile, which has a small mass per unit area and can effectively increase the volumetric energy density of the battery. However, the high Molecular polymer substrates will shrink under high temperature conditions (170-200°C), which will eventually lead to battery safety problems

Method used

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  • Current collector and preparation method and application thereof
  • Current collector and preparation method and application thereof
  • Current collector and preparation method and application thereof

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preparation example Construction

[0033] The present invention also provides the preparation method of the current collector described in the above technical solution, comprising the following steps:

[0034] A conductive metal layer is deposited on the surface and pore structure of a liquid crystal polymer modified fiber cloth substrate with a porous structure to obtain a current collector.

[0035] In the present invention, unless otherwise specified, all preparation raw materials are commercially available products well known to those skilled in the art.

[0036] Before deposition, in the present invention, the liquid crystal polymer modified fiber cloth substrate with porous structure is preferably pretreated, and the pretreatment preferably includes degreasing, roughening and activation in sequence; The process of oil and roughening is not particularly limited, and it can be carried out by a process well known to those skilled in the art. In the present invention, the activation solution used for the act...

Embodiment 1～4

[0055] The liquid crystal polymer non-woven fabrics of the Vecrus series of Japan Kuraray Company, with the grades of MBBK4F-F (Example 1) and MBBK6F-F (Examples 2-4), were successively degreasing, roughening and activating to obtain pre-preg. The treated liquid crystal polymer (LCP) non-woven fabric;

[0056] The liquid crystal polymer non-woven fabric is placed in an electroless plating solution (including 6g / L of anhydrous copper sulfate, 8.5g / L of formaldehyde, 5g / L of complexing agent (mass ratio of 1.3:1 sodium tartrate and Disodium EDTA), 0.041g / L thiourea, and sodium hydroxide as a pH adjuster to adjust the pH value of the electroless plating solution to 11), after electroless plating at 60 °C for 1 min, rinse with deionized water, take out and place in 75 ° C, drying under the hot pressing condition of 2 kg / square inch to obtain a current collector (metallized polymer-based non-woven fabric);

Embodiment 5

[0058] The Vecrus series of Japan Kuraray Company is a liquid crystal polymer non-woven fabric with the grade of MBBK4F-F. The conventional vacuum magnetron sputtering process is used to coat a layer of nickel metal on the surface of the non-woven fabric with a thickness of 0.1um;

[0059] The liquid crystal polymer non-woven fabric is placed in the electroplating solution aqueous solution, and the electroplating solution contains 70g / L of copper pyrophosphate, 300g / L of potassium pyrophosphate, 15g / L of citric acid and 3ml / L of ammonia water, adjusted to PH to about 7.5, after electroplating at 50°C for 1min, washed with deionized water, taken out and dried at 75°C, under hot pressing conditions of 2 kg / square inch, to obtain a current collector (metallized polymer-based non-woven fabric) .

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a current collector and a preparation method and application thereof. The current collector provided by the invention comprises a liquid crystal polymer modified fiber cloth substrate with a porous structure and a conductive metal layer attached to the surface of the liquid crystal polymer modified fiber cloth substrate with the porous structure and in the porous structure. The liquid crystal polymer modified fiber cloth substrate with a porous structure is used as the current collector, so that an active material (a conductive metal layer) can be embedded into the pores of the current collector, the active material is mutually communicated on the two surfaces of the current collector, the content of the active material in unit volume is increased, and lithium ions can shuttle through the two surfaces of the pole piece; the safety is further improved; and the liquid crystal polymer material in the liquid crystal polymer modified fiber cloth substrate with the porous structure has the characteristic of high temperature resistance, so that when the liquid crystal polymer modified fiber cloth substrate is used as a current collector, the problem of thermal shrinkage caused by over-high working temperature can be relieved, and the safety of the lithium ion battery is further improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a current collector and a preparation method and application thereof. Background technique [0002] At present, the electrode sheets of lithium ion batteries mainly adopt a hierarchical stacking mode in which electrode materials are coated on metal foil current collectors. Since the metal foil current collector and electrode material layers are completely separated, the contact between the two layers forms a large interfacial resistance. Improving its surface contact with the electrode material layer has become one of the key issues in the fabrication of high specific energy batteries. [0003] The traditional positive electrode current collector is made of aluminum foil with a thickness of 15-20 μm, and the negative electrode current collector is made of copper foil with a thickness of 8-12 μm. Metal foil has good electrical conductivity, but the machining perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01M4/66
CPCH01M4/64H01M4/667H01M4/668
Inventor 栗西亮李安琪黄兵崔亚楠李涛
Owner 上海飞鸿创联新能源发展有限公司
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