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Three-dimensional porous current collector as well as preparation method and use thereof

A three-dimensional porous and current collector technology, applied in the field of electrochemical power sources, can solve the problems of poor mechanical strength of porous copper, low purity of porous copper, unsuitable current collectors, etc., and achieve the goal of suitable for large-scale production and suppressing dendrite The effect of formation and easy availability of raw materials

Active Publication Date: 2015-06-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as a kind of commonly used method for preparing porous copper is dealloying method (such as patent CN102943187A, CN101956090A, CN101596598A, CN103343253A etc.), this method not only has complicated steps, harsh conditions, waste of resources, gained porous copper purity is not high, and gained Nanopores are not suitable for supporting metal anodes
The mechanical strength of the porous copper obtained by other methods from solution deposition or electrodeposition (such as patent CN103046088A, CN103132111A, CN104057099A, etc.) does not meet the requirements as a current collector, and is even more unsuitable as a current collector for metal negative electrodes

Method used

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  • Three-dimensional porous current collector as well as preparation method and use thereof
  • Three-dimensional porous current collector as well as preparation method and use thereof
  • Three-dimensional porous current collector as well as preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of three-dimensional porous copper foil

[0025] (1) Wash the copper foil (purchased from Great Britain Cambridge Co., Ltd., about 25 μm) with dilute hydrochloric acid and distilled water, then sink into the bottom of ammonia water (5wt%) to soak, and let it stand for 36 hours;

[0026] (2) Remove Cu(OH) deposited on the surface 2 For the copper foil that turns blue, wash the residual ammonia water on the surface with water, and then dry it in an oven at 60°C;

[0027] (3) Place the dried copper foil in a muffle furnace at 5°C min -1 The heating rate is heated to 180°C and maintained for 4h, the Cu(OH) 2 Dehydration forms CuO.

[0028] (4) Put the copper foil in a tube furnace, and heat it at 5°C for min in a hydrogen-argon mixed atmosphere (hydrogen 5% volume ratio). -1 The heating rate was heated to 400 °C and maintained for 10 h to reduce CuO to copper. The obtained copper foil is a three-dimensional porous copper foil.

[0029] From figure 1 T...

Embodiment 2

[0039] The only difference from Example 1 is that (1) to prepare three-dimensional porous copper foil, the concentration of ammonia water used is 1 wt%.

[0040] After testing, the obtained three-dimensional porous copper structure is composed of micron bundles, each micron bundle is composed of micron fibers, the diameter of the micron fibers is about 1 μm, the thickness of the porous structure is about 10 μm, the pore diameter is 5-10 μm, and the pore volume is 1×10 -3 cm 3 / cm 2 .

[0041] The three-dimensional porous copper foil prepared above is used as the cathode, and the lithium sheet is used as the anode. After electrolysis, lithium is deposited in the pores of the copper to obtain the lithium metal negative electrode. It can be clearly seen that the lithium metal negative electrode is deposited along the three-dimensional copper skeleton and filled Copper-filled pores without vertical growth of lithium dendrites.

[0042] According to the scanning electron microsc...

Embodiment 3

[0044] The only difference from Example 1 is that (1) to prepare three-dimensional porous copper foil, the concentration of ammonia water used is 10wt%.

[0045] After testing, the obtained three-dimensional porous copper structure is composed of micron bundles, each micron bundle is composed of micron fibers, the diameter of the micron fibers is 1.5-2 μm, the thickness of the porous structure is about 50 μm, the pore diameter is 10-20 μm, and the pore volume is 5× 10 -3 cm 3 / cm 2 .

[0046] The three-dimensional porous copper foil prepared above is used as the cathode, and the lithium sheet is used as the anode. After electrolysis, lithium is deposited in the pores of the copper to obtain the lithium metal negative electrode. It can be clearly seen that the lithium metal negative electrode is deposited along the three-dimensional copper skeleton and filled Copper-filled pores without vertical growth of lithium dendrites.

[0047] According to the scanning electron micros...

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Abstract

The invention discloses a three-dimensional porous current collector which is used as a negative current collector of a metal secondary battery. At least one surface of the three-dimensional porous current collector is provided with a porous structure, sufficient in pore volume and moderate in thickness. Compared with a flat current collector, a metal negative electrode loaded on the three-dimensional porous current collector can be used for effectively restraining the formation of dendritic crystals, so that the safety of the metal negative electrode is improved, the cycle life of the metal negative electrode is long, and the voltage polarization of the metal negative electrode is small. The three-dimensional porous current collector can be prepared from a flat copper foil, and can be prepared through simple steps. The method for preparing the three-dimensional porous current collector is simple, suitable for large-scale production and very high in practicability, and the raw materials are easily available.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to a three-dimensional porous current collector, its preparation method, a high-safety metal negative electrode using the three-dimensional porous current collector, a safe and long-life metal secondary battery using the negative electrode and its high-temperature Applications in energy density energy storage devices. Background technique [0002] With the vigorous development of portable devices and electric vehicles, people's demand for high-energy-density energy storage devices is increasing, and traditional lithium-ion batteries are gradually unable to meet the needs of future energy storage density. Metal secondary batteries are a type of secondary batteries that directly use metal anodes such as lithium, sodium, and magnesium, and have attracted widespread attention due to their high energy density. Taking metal lithium secondary battery as an example,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/80H01M4/66H01M4/04
CPCH01M4/66H01M4/661H01M4/80H01M4/806Y02E60/10
Inventor 郭玉国杨春鹏张帅锋殷雅霞
Owner INST OF CHEM CHINESE ACAD OF SCI
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