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Process of preparing graphite-base current collector

A current collector, graphite-based technology, applied in the field of preparation of energy storage battery electrodes, can solve the problems of expensive graphite fiber, unfavorable industrial promotion and application, etc., and achieve the effect of reducing material cost, good mechanical strength and electrical conductivity

Inactive Publication Date: 2009-05-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of graphite fiber with high conductivity is relatively expensive, which is not conducive to industrial promotion and application.

Method used

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  • Process of preparing graphite-base current collector
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  • Process of preparing graphite-base current collector

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Graphite: acetylene black: polyethylene: polyvinylidene fluoride PVDF is 30:30:30:10 by weight percentage, all raw materials are mixed, and dried at 120 ° C for 12 hours;

[0020] (2) The raw material mixture was heated at a constant temperature of 140°C for 20 minutes and fully stirred;

[0021] (3) Keep the constant temperature after heating the mold to 140° C. by the heating rod inserted on the cast iron tabletting mold, then the mixture is placed in the mold for another 20 minutes at a constant temperature, and while the temperature is constant, carry out tabletting with a pressure of 25 MPa for 15 minutes.

Embodiment 2

[0023] (1) Graphite: acetylene black: polyethylene: polyvinylidene fluoride PVDF is 30:10:50:10 by weight percentage, all raw materials are mixed, and dried at 120 ° C for 12 hours;

[0024] (2) The raw material mixture was heated at a constant temperature of 140°C for 40 minutes and fully stirred;

[0025] (3) Keep the constant temperature after heating the mold to 140° C. by the heating rod inserted on the cast iron tableting mold, then the mixture is placed in the mold for another 20 minutes at a constant temperature, and while the temperature is constant, perform tableting with a pressure of 20 MPa for 20 minutes.

Embodiment 3

[0027] (1) Graphite: acetylene black: polyethylene: polyvinylidene fluoride PVDF is 30:20:30:20 by weight percentage, mix all raw materials, and dry at 80°C for 24 hours;

[0028] (2) The raw material mixture was heated at a constant temperature of 140°C for 10 minutes and fully stirred;

[0029] (3) Keep the constant temperature after heating the mold to 180° C. by the heating rod inserted on the cast iron tabletting mold, then the mixture is placed in the mold for another 20 minutes at a constant temperature, and while the temperature is constant, perform tabletting with a pressure of 25 MPa for 20 minutes.

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Abstract

The present invention is process of preparing graphite- base current collector, relates to the preparation of all-vanadium oxidation-reduction liquid flow cell current collector. The process of preparing graphite- base current collector includes adding low density polyethylene powder below 50 %, adding graphite powder, rather than graphite fiber, and acetylene black as conducting additive, mixing low density polyethylene powder and polyvinylidene fluoride or polytetrafluoroethylene in certain ratio as adhesive, hot pressing at 140-180 deg.c and 15-40 MPa to form. The present invention has lowered cost, and can obtain conducting current collector plate with excellent mechanism performance and capable of sealing the cell completely and maintaining the chemical and electrochemical stability of cell and the volume resistivity below 1.5 ohm.cm. The current collector may be used in all-vanadium oxidation-reduction liquid flow cell.

Description

technical field [0001] The invention relates to a preparation method of an electrode of an energy storage battery, in particular to a preparation of a graphite-based current collector for an all-vanadium redox flow battery. Background technique [0002] Redox Flow Battery (RFB for short) is an electrochemical system that uses oxidation-reduction reactions of elements with different valence states for energy storage and conversion. As an electrochemical system, RFB can store energy in solutions with different electrochemical potentials by changing the oxidation-reduction reaction through charging. Compared with other energy storage systems, RFB has the advantages of high current deep charge and discharge, high overall energy efficiency, and large-scale application. with V 5+ / V 4+ and V 3+ / V 2+ The electric pair is used as the positive and negative active materials of the battery respectively, which is called an all-vanadium redox flow battery. The charging reaction of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K3/04H01M4/64
CPCY02E60/12Y02E60/10
Inventor 王新东王文红薛方勤
Owner UNIV OF SCI & TECH BEIJING
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