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Method for preparing electrode by employing composite graphite

A technology for compounding graphite and preparing electrodes, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of poor electrolyte compatibility and low tap density, and achieves simple method, high initial charge-discharge efficiency and reversible charge-discharge. The effect of capacity

Inactive Publication Date: 2015-05-06
QINGDAO TAIHAODA CARBON MATERIAL
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, natural graphite still has disadvantages such as low tap density and poor compatibility with electrolytes in practical applications.

Method used

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Embodiment

[0013] The method for preparing an electrode using composite graphite in this embodiment includes the following steps: (1) preparing composite graphite powder, mixing the prepared composite graphite powder and water-based binder evenly, and mixing the prepared composite graphite powder and water-based binder The weight ratio is 20:1; (2) Coat the uniformly mixed composite graphite powder and water-based binder on the copper foil, then dry it under vacuum at 120°C for 5 hours, and punch it out with a Φ14mm stainless steel punch The working electrode sheet is assembled in a glove box filled with argon with a lithium metal sheet as the counter electrode and a polypropylene microporous membrane as the diaphragm. The electrolyte concentration is 1mol / L. The electrolyte uses lithium hexaphosphate as the solute , ethylene carbonate as the solvent, the volume ratio of the two is 1:1.

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Abstract

A disclosed method for preparing electrode by employing composite graphite comprises: uniformly mixing graphite powder with an aqueous binder according to the weight ratio of 20:1, coating copper foil with the uniformed-mixed composite material of graphite powder and the aqueous binder, drying at 120 DEG C in vacuum for 5 h, preparing a work electrode sheet through punching by using a stainless steel puncher with the diameter of 14 mm, taking a metal lithium sheet as an electrode, taking a polypropylene millipore membrane as a separator, controlling the electrolyte concentration to be 1 mol / L, and assembling in a glove box filled with argon, wherein the electrolyte employs lithium hexafluorophosphate as a solute and employs ethylene carbonate as a solvent, and the volume ratio of the solute to the solvent is 1:1. By taking composite graphite as the electrode, because the graphite surface is provided with a uniform amorphous carbon coating, the prepared electrode possesses substantially high initial charge / discharge efficiency and reversible charge / discharge capacity.

Description

[0001] technical field [0002] The invention belongs to the technical field of graphite electrodes, and in particular relates to a method for preparing electrodes by using composite graphite. [0003] Background technique [0004] At present, the negative electrode materials widely used in the production of lithium-ion batteries are carbon-based materials. The reversible charge and discharge capacity of natural graphite can reach 300mAh / g, and it has a low and flat potential platform, and it is cheap and has a wide range of material sources. However, natural graphite still has disadvantages such as low tap density and poor compatibility with electrolytes in practical applications. [0005] Contents of the invention [0006] In order to overcome the above-mentioned technical problems existing in the prior art, the object of the present invention is to provide a method for preparing an electrode using composite graphite, which improves the physical and chemical propertie...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/62
CPCH01M4/1393H01M4/362H01M4/583H01M4/621Y02E60/10
Inventor 乔帅
Owner QINGDAO TAIHAODA CARBON MATERIAL
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