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Three-dimensional porous current collector with gradient pore structure and its preparation method and application

A three-dimensional porous and gradient hole technology, applied in structural parts, electrode carriers/current collectors, electrical components, etc., can solve the problems of unsatisfactory electrochemical performance, poor uniformity of active metal deposition, etc., and achieve excellent long-term cycle stability, The preparation method is simple and easy, and the effect of inhibiting dendrite growth

Active Publication Date: 2022-02-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor uniformity of active metal deposition and unsatisfactory electrochemical performance in existing current collectors, the first purpose of the present invention is to provide a method for preparing a three-dimensional porous current collector with a gradient pore structure, aiming to prepare a Three-dimensional porous current collector with gradient hierarchical pore structure and excellent electrochemical performance

Method used

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  • Three-dimensional porous current collector with gradient pore structure and its preparation method and application
  • Three-dimensional porous current collector with gradient pore structure and its preparation method and application
  • Three-dimensional porous current collector with gradient pore structure and its preparation method and application

Examples

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Effect test

Embodiment 1

[0076] First, 500-mesh copper-zinc alloy powder (powder B) was evenly spread in a high-purity graphite mold with an inner diameter of 14 mm, and the powder spreading height was 0.2 mm, and then the surface of the powder was scraped flat with a glass plate. Then spread a layer of 200-mesh copper-zinc alloy powder (powder A) on the surface of the powder, the height of the powder spreading is 0.3 mm, and the surface is scraped flat with a glass plate. After scraping, the total height of the powder is 0.5 mm. Then adopt the conventional high-temperature sintering method: put the powder-coated mold into the sintering furnace, the atmosphere is argon atmospheric pressure, and adopt a gradient temperature rise: the temperature is raised to 600 °C at 5 °C / min and kept for 1 h; then the temperature is increased at 2 °C / min Raise the temperature to 800°C and keep it warm for 3 h; then cool naturally. After cooling, remove the mold and take it apart. That is, a three-dimensional porous ...

Embodiment 2

[0080] The resulting three-dimensional porous current collector is prepared in the same manner as in Example 1, and is used for the negative electrode of a zinc metal battery (the large pore side is close to the separator), which is used as the positive electrode, and the 2M ZnSO4 solution is used as the electrolyte to assemble the battery. At the beginning of the voltage, discharge at a current density of 1 mA cm-2 for 1 h and then charge to 1 V. The coulombic efficiency of the current collector is characterized by calculating the ratio of the charged power to the discharged power. The coulombic efficiency can reach 97% and is stable for 90 cycles. .

Embodiment 3

[0082] Compared with Example 1, the only difference is that the powder B is a 500-mesh pure copper powder; the powder A is a 200-mesh pure copper powder, and other conditions are the same as in Example 1.

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Abstract

The invention belongs to the field of negative electrode materials, and specifically discloses a three-dimensional porous current collector with a gradient pore structure and its preparation method and application; the method is: laying raw material powder A and raw material powder B in any order in a mold, and then carrying out normal The raw material powder A and the raw material powder B are metal raw material powders prepared by water atomization or electrolysis, and the D50 radii of the two are different. In addition, the present invention also provides the current collector prepared by the preparation method and its application in metal batteries. The present invention found that through the joint control of the raw material powder A, raw material powder B morphology, gradation structure, layered material laying method and sintering method, a new current collector with hierarchical pore structure can be obtained; more importantly, the The special current collector constructed can effectively improve the uniform deposition of metals, thereby helping to improve the electrochemical performance of metal batteries, especially the long-term cycle stability.

Description

technical field [0001] The invention belongs to the technical field of metal batteries, and in particular relates to a three-dimensional porous current collector with a gradient pore structure for a metal battery and a preparation method and application thereof. Background technique [0002] With the rapid development of high-end electronic products such as mobile phones and electric vehicles, people's demand for energy storage devices is increasing day by day. At the same time, the existing commercial lithium-ion batteries are limited by their low theoretical capacity, making it difficult to achieve wider applications. A metal battery is a secondary battery that uses metals such as lithium, sodium, zinc, and magnesium as negative electrodes. It has high theoretical specific capacity and safety, and is hoped to be applied to the next generation of high specific energy battery materials. Taking lithium metal batteries as an example, lithium has attracted widespread attention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/80H01M4/66H01M10/052H01M10/054
CPCH01M4/803H01M4/661H01M10/052H01M10/054Y02E60/10
Inventor 陈立宝杨昊陈月皎梅琳
Owner CENT SOUTH UNIV