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Current collector for metal secondary battery negative electrode and preparation method and application for current collector

A secondary battery and current collector technology, applied in the field of electrochemical power sources, can solve the problems of introducing impurities, weak interaction between carbon nanotubes and substrates, and high energy consumption

Active Publication Date: 2016-05-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method first requires the use of a catalyst, the presence of which introduces impurities
Moreover, the substrate requires pretreatment and subsequent purification steps, resulting in complicated steps and waste of resources
At the same time, since the growth of carbon nanotubes is point growth along the catalyst, the force between the obtained carbon nanotubes and the substrate is weak, and it is difficult to form an organic combination between the two, and the prepared carbon nanotubes are easy to grow from the substrate. exfoliation, the structural consistency of carbon nanotubes obtained by this method is poor
In addition, when the currently reported direct growth of carbon nanotubes and graphene on the basis of nickel foam (such as patents CN101661840A, CN104577059A, CN102931437A), it is necessary to maintain a relatively high degree of vacuum, which requires very high requirements for equipment and operating procedures, resulting in The steps are complicated and consume a lot of energy
Moreover, the prepared carbon nanotubes, graphene and other carbon materials have a high degree of graphitization, a small interlayer spacing, and a relatively dense structure, which makes it difficult to support metal negative electrodes.

Method used

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  • Current collector for metal secondary battery negative electrode and preparation method and application for current collector
  • Current collector for metal secondary battery negative electrode and preparation method and application for current collector
  • Current collector for metal secondary battery negative electrode and preparation method and application for current collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of three-dimensional porous materials decorated with carbon nanospheres

[0032] (1) Wash the commercial nickel foam, dry it, and heat it at 900°C under H 2 / Ar mixed reducing atmosphere annealed for 30min to remove the oxide layer on the surface of nickel foam. From figure 1 The scanning electron micrograph of the nickel foam can see the three-dimensional porous structure with a pore size of 50-50 μm.

[0033] (2) Place the annealed nickel foam in a CVD tube furnace, 2 h 2Carrier gas, heat up at a rate of 10°C / min, the flow ratio of hydrocarbon gas to carrier gas is 400sccm:25sccm, deposit at 900°C for 5min, and the deposited carbon mass is 1-10mg / cm 2 . From figure 2 The scanning electron micrograph of can clearly see that described carbon is deposited on the framework of porous nickel foam, image 3 for figure 2 The magnification of the scanning electron microscope photo, from which it can be seen that the deposited carbon morphology is a sp...

Embodiment 2

[0043] The difference from Example 1 is that (1) prepare a three-dimensional porous current collector modified by carbon nanospheres, and the hydrocarbon gas is ethylene (C 2 h 4 ), C 2 h 4 The flow ratio of gas to carrier gas is 340sccm:50sccm, deposited at 950°C for 4 minutes, and the distribution of deposited carbon is relatively uniform, with a mass of 1-6mg / cm 2 , the diameter of carbon spheres is 1100-1400nm. Deposit 2mAhcm -2 The deposition / stripping efficiency of Li was 85% for the first time and reached 98.5% after 2 cycles.

Embodiment 3

[0045] The difference from Example 1 is that (1) prepare a three-dimensional porous current collector modified by carbon nanospheres, the hydrocarbon gas is toluene, the flow ratio of toluene to carrier gas is 320sccm:25sccm, deposited at 1000°C for 10min, after characterization, The deposited carbon is evenly distributed, with a mass of 1-10mg / cm 2 , the diameter of carbon spheres is 1000-1300nm. Deposit 2mAhcm -2 The deposition / stripping efficiency of Li was 82% for the first time after adding Li, and reached 98% after 2 cycles.

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Abstract

The invention relates to a modifying method and an application for a current collector for a metal secondary battery negative electrode. A carbon nanosphere modified three-dimensional porous current collector material used as the metal secondary battery negative electrode is prepared firstly through a chemical vapor deposition method; and then the metal needing to be modified is electrochemically deposited in the carbon nanosphere modified three-dimensional porous current collector material to obtain a metal negative electrode material of the carbon nanosphere modified three-dimensional porous current collector material. Compared with a current collector only adopting foamed nickel, the three-dimensional porous carbon-loaded metal negative electrode employing the current collector provided by the invention can effectively improve lithium deposition / peeling efficiency, restrain formation of dendritic crystals, improve safety of the metal negative electrode, prolong the cycling life, and lower polarization.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to a current collector for negative electrodes of metal secondary batteries and its preparation method and application. The current collector can effectively prevent the generation of dendrites during the electrochemical deposition / stripping process of metals. The metal negative electrode using the current collector can significantly improve the safety and coulombic efficiency of the rechargeable secondary battery. Background technique [0002] Due to its high energy density and good cycle life, lithium-ion batteries are widely used in small and medium-sized energy fields such as mobile phones, notebook computers, cameras, and electric vehicles, and have become an indispensable part of the current energy economy. With the development of large-scale industrial energy storage such as energy storage grid and other emerging industries, traditional lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M10/052
CPCH01M4/661H01M4/663H01M4/667H01M4/808H01M10/052Y02E60/10
Inventor 郭玉国叶欢殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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