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Preparation method of three-dimensional electrode slice based on aqueous adhesive

A water-based binder, three-dimensional electrode technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of high price of foamed graphite mesh, insufficient ductility, and the bonding firmness needs to be further improved. Effects of improving electron conductivity and improving discharge rate characteristics

Active Publication Date: 2015-08-19
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is beneficial to the direct contact between powder lithium and electrode current collector, but the bonding firmness needs to be further improved
It has been reported in the literature that attaching the composite of graphene and silicon to the three-dimensional graphite foam network is also beneficial to improve the electrochemical performance of the electrode sheet, but compared with copper foam or nickel foam, the price of graphite foam network is higher, and the ductility is relatively high. insufficient

Method used

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  • Preparation method of three-dimensional electrode slice based on aqueous adhesive
  • Preparation method of three-dimensional electrode slice based on aqueous adhesive
  • Preparation method of three-dimensional electrode slice based on aqueous adhesive

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Experimental program
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Effect test

Embodiment

[0035] Embodiment 1: An embodiment of the preparation method of the three-dimensional electrode pole piece based on the aqueous binder of the present invention

[0036] A water-soluble polyurethane (PU) solution with a concentration of 3.8 wt.% is used as a binder, elemental silicon powder is used as the negative electrode active material, acetylene black is used as a conductive agent, and three-dimensional porous nickel foam is used as a collector to prepare a three-dimensional silicon negative electrode. Experimental steps:

[0037] Fabrication of a three-dimensional silicon negative electrode piece: mixing the negative electrode active material, the binder, and the conductive agent to obtain a mixture, where the weight percentage of the negative electrode active material is 70% based on the total weight of the mixture The weight percentage of the binder is 10%, and the weight percentage of the conductive agent is 20%; the resulting mixture is adjusted to a negative electrode slu...

Embodiment 2

[0041] Embodiment 2: An embodiment of the preparation method of the three-dimensional electrode pole piece based on the aqueous binder of the present invention

[0042] A 2wt.% sodium carboxymethylcellulose (CMC) aqueous solution was used as a binder, acetylene black was used as a conductive agent, elemental silicon powder was used as the negative electrode active material, and three-dimensional porous nickel foam was used as a collector to prepare a three-dimensional silicon negative electrode. Film, experimental steps:

[0043] Fabrication of the three-dimensional silicon negative electrode piece: mixing the negative electrode active material, the binder, and the conductive agent to obtain a mixture, wherein the weight percentage of the negative electrode active material is 90% based on the total weight of the mixture The weight percentage of the binder is 1%, and the weight percentage of the conductive agent is 9%; the resulting mixture is adjusted into a negative electrode slur...

Embodiment 3

[0047] Embodiment 3: An embodiment of the preparation method of the three-dimensional electrode pole piece based on the aqueous binder of the present invention

[0048] A three-dimensional silicon anode electrode piece prepared with a 5wt.% aqueous solution of carboxylated chitosan (C-CTS) as a binder, acetylene black as a conductive agent, and three-dimensional porous nickel foam as a current collector. Experimental steps:

[0049] Fabrication of three-dimensional silicon negative pole piece: mixing the above negative active material, the above binder and the above conductive agent to obtain a mixture, wherein based on the total weight of the mixture, the weight percentage of the negative active material is 80% , The weight percentage of the binder is 5%, and the weight percentage of the conductive agent is 15%; the resulting mixture is adjusted into a negative electrode slurry with a viscosity of 3000 cps with water as a solvent, and a 1.0mm thick three-dimensional The porous nic...

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Abstract

The invention provides a three-dimensional electrode slice based on an aqueous adhesive and a preparation method of the three-dimensional electrode slice. The method comprises the following steps: mixing the aqueous adhesive, a conductive agent and an active substance into slurry according to a certain proportion, and coating a three-dimensional porous metal current collector with the slurry; and performing the operation of drying, rolling, slicing or further carbonization and the like to prepare the three-dimensional electrode slice for a lithium ion battery. A water-soluble organic polymer material is adopted as the adhesive, so that the advantages of low price, wide source, environmental friendliness and the like are realized. The prepared three-dimensional electrode slice has a porous three-dimensional structure. Through the three-dimensional structure, infiltration of electrolyte is facilitated; the interface compatibility between the electrolyte and the active substance is improved; and the discharge rate characteristic of the battery is improved effectively. The three-dimensional electrode slice is simple in structure, simple and convenient in preparation process, and easy to implement.

Description

Technical field [0001] The invention relates to a method for preparing a three-dimensional electrode pole piece, in particular to a method for preparing a three-dimensional electrode pole piece based on an aqueous binder. Background technique [0002] With the steady growth of consumer electronics demand, the rapid development of hybrid and pure electric vehicles, and the acceleration of the construction of new energy grid-connected power stations, high-performance energy storage batteries have become one of the core technologies for vigorous development. Among them, lithium-ion batteries have great potential in the field of distributed power generation and energy storage due to their advantages of high voltage, large capacity, good cycle performance, and low pollution. With the continuous improvement of the cost performance of lithium-ion batteries, the trend of replacing traditional batteries such as lead-acid and nickel-hydrogen batteries with lithium batteries has become incr...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M4/139
CPCY02E60/10
Inventor 张灵志邵丹李勇钟皓想唐道平
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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