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Porous metal current collector, preparation method, negative electrode and battery

A porous metal and current collector technology, applied in the direction of electrode carrier/current collector, electrode manufacturing, battery electrodes, etc., can solve the problems of complex preparation process of metal current collectors, achieve formation and growth inhibition, deep discharge, and simple preparation method Effect

Active Publication Date: 2021-02-09
北京恩力动力科技有限公司 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem of complex preparation process of the above-mentioned metal current collector, the present invention provides a porous metal current collector, a preparation method, a negative electrode and a battery, the preparation method is simple, and the obtained porous metal current collector has a three-dimensional porous structure. The prepared porous metal current collector as the negative electrode current collector has higher and more stable Coulombic efficiency and longer cycle life. The three-dimensional porous metal can effectively inhibit the formation and growth of dendrites in the negative electrode, and can achieve deep discharge

Method used

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  • Porous metal current collector, preparation method, negative electrode and battery
  • Porous metal current collector, preparation method, negative electrode and battery
  • Porous metal current collector, preparation method, negative electrode and battery

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preparation example Construction

[0047] The preparation method of the porous metal current collector of the present invention comprises the steps of pre-mixing dendritic metal particle powder and an organic binder and then compacting; the metal particle powder contains electrolytic metal particle powder prepared by an electrolytic method, and the The electrolytic metal particle powder has the following characteristics: it has a dendritic structure, the particle size distribution is between 0.1-100 microns, and the tap density is 2.0-3.5g / cm 3 , the purity is greater than 90%.

[0048] After a large number of tests and analyzes by the inventor, the copper current collector with high specific surface area of ​​the present invention has strong lithium affinity due to the capillary siphon force, so that molten metal lithium can easily immerse into the current collector, and quickly and evenly dispersed, so as to prepare a three-dimensional structure of high specific surface area lithium metal negative electrode, ...

Embodiment 1

[0064] A preparation process of the porous metal current collector provided in this embodiment is to carry out roll-to-roll (Roll-to-Roll) rolling continuous pressing by powder rolling method, such as figure 1 shown. Preferably, a raw material particle is an electrolytic copper powder having the following characteristics: 1) has a microscopic dendritic structure and a nanoscale irregular surface microstructure; 2) the particle size distribution is between 0.1-100 microns; 3) the tap density At 2.0-3.5g / cm 3 4) the purity is more than 95%.

[0065] A typical continuous rolling process is as follows:

[0066] 1) Fully mix the above electrolytic copper powder and anionic polyacrylamide (APAM) according to the weight ratio of 9:1;

[0067] 2) Put the above mixture into figure 1 In the mixing device shown, the mixture particles are evenly conveyed to the gap between the pressure rollers through the quantitative supply device;

[0068] 3) Roll the mixture particles into a porou...

Embodiment 2

[0076] Another preparation method of the porous metal current collector provided in this example is to use the tableting method to compress the powder material that is fully mixed with the metal particle powder and the organic binder. The electrolytic copper powder of embodiment 1 is also selected as the raw material particles, and the specific technological process is as follows:

[0077] 1) Fully mix the electrolytic copper powder and anionic polyacrylamide (APAM) according to the weight ratio of 100:1;

[0078] 2) The above mixture is put into the mixing device, and put into the die cavity of the tablet press through the quantitative supply device, and the raw material particles are evenly distributed in the die cavity through the distributing device;

[0079] 3) After setting the appropriate pressure and holding time, the pressure is between 10 tons and 50 tons, start the tablet press, use high-frequency heating, the temperature is between 200 ° C, and press the metal part...

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Abstract

The invention discloses a porous metal current collector, a preparation method, a negative electrode and a battery, and belongs to the field of battery materials for vehicle-mounted power, energy storage and communication. The preparation method of the porous metal current collector comprises the steps: premixing and pressing dendritic metal particle powder and an organic matter binder, wherein the metal particle powder contains electrolytic metal particle powder prepared through an electrolysis method, and the electrolytic metal particle powder has the following characteristics that the porous metal current collector has a dendritic structure, and the particle size distribution is 0.1-100 microns, the tap density is 2.0-3.5 g / cm < 3 >, and the purity is greater than 90%. The porosity of the current collector is greater than 40%, the specific surface area of the current collector is greater than 10 times of the geometric surface area of the current collector, and the thickness of the current collector is 1-1,000 microns.

Description

technical field [0001] The invention belongs to the field of battery materials for vehicle power, energy storage and communication, and relates to a porous metal current collector with a three-dimensional structure for a secondary battery, a preparation method, a negative electrode and a battery. Background technique [0002] With the rapid development of electric vehicles and large-scale energy storage applications, higher requirements are placed on lithium-ion batteries in terms of energy density, cycle life, and cost. Due to its high theoretical specific capacity, low potential and light weight, metal lithium is considered to be a very potential anode material for the next generation of batteries. However, there are still huge challenges in the electrochemical deposition / cycling process of lithium metal, including: 1) Growth of lithium dendrites: the growth of lithium dendrites will not only lead to the degradation of battery performance, but also when the dendrites pierc...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M4/80H01M10/0525H01M4/04
CPCH01M4/80H01M4/70H01M10/0525H01M4/043Y02E60/10
Inventor 车勇曹翊杨鹏丁波
Owner 北京恩力动力科技有限公司
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