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A graphite-based conductive composite material used as a proton exchange membrane fuel cell bipolar plate and its preparation

A conductive composite material, proton exchange membrane technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of high price and cost of mesocarbon microspheres, complex and inefficient preparation process, affecting quantitative production efficiency, etc. The effect of good uniformity and uniformity of the board, simple operation steps and equipment, excellent electrical conductivity and mechanical strength

Active Publication Date: 2022-04-22
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN101113239A discloses a method for preparing graphite / polyphenylene sulfide conductive composite material. The resin material components adopt a single PPS resin and a single graphite powder material without using reinforcing fillers. The molding process steps include heating, In the process of heat preservation, pressurization, and cooling, the preparation cycle is more than 5 minutes, which affects the quantitative production efficiency, and its mechanical strength is low, the lowest is 10MPa, and the bulk conductivity is low; patent CN1710738A discloses another mesophase carbon microsphere / polymer The phenylene sulfide conductive composite material method has a molding cycle greater than 10min, and its electrical conductivity is low, and the electrical conductivity of the embodiment is as low as 10S cm -1 , and the price and cost of mesocarbon microspheres are high, and cold demoulding is required, the preparation process is complex and inefficient, and it is difficult to achieve quantitative production

Method used

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  • A graphite-based conductive composite material used as a proton exchange membrane fuel cell bipolar plate and its preparation
  • A graphite-based conductive composite material used as a proton exchange membrane fuel cell bipolar plate and its preparation

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Experimental program
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Effect test

Embodiment 1

[0026] The graphite / resin composite material bipolar plate is composed of the following components by weight percentage: the content of graphite is 70wt%, the content of graphite fiber is 10wt%, the content of polyphenylene sulfide is 18wt%, and the content of phenolic resin is 2wt%. The raw powder is mixed evenly in a stirring mixer, and the powder is placed in a mold to be laid evenly. The pressure is 200MPa, the temperature is 120°C, and the holding time is 30 seconds. Repeat the production, and 100 pieces can be prepared per hour. 100 sheets are stacked, placed in a high-temperature furnace at a rate of 3°C / min, heated to 350°C, kept for 30 minutes, then cooled with the furnace and taken out. According to this embodiment, mass production can be realized, and a single forming equipment production line can achieve a daily production capacity of 1,000 sheets, and the production efficiency is greatly improved compared with the existing production methods of the same type.

Embodiment 2

[0028] Graphite / resin composite material bipolar plate is made up of the following components by weight percentage: graphite content is 70wt%, graphite fiber content is 8wt%, carbon black 2wt%, polyphenylene sulfide content is 15wt%, phenolic resin content is 5wt%, put the mixed powder in the mold and lay it evenly, and press it with a pressure of 150MPa, a temperature of 110°C, and a holding time of 30 seconds; after demoulding, put the plate in a high-temperature furnace at 300°C, keep it warm for 40 minutes, and then cool with the furnace , to obtain the target bipolar plate.

Embodiment 3

[0030] Graphite / resin composite material bipolar plate is made up of the following components by weight percentage: graphite content is 60wt%, graphite fiber content is 28wt%, carbon black 2wt%, polyphenylene sulfide content is 9wt%, phenolic resin content is 1wt%, after mixing, press molding with a pressure of 250MPa, a temperature of 130°C, and a holding time of 30 seconds; after demoulding, place the plate in a high-temperature furnace at a rate of 2°C / min, raise the temperature to 320°C, keep it warm for 60 minutes, and then follow the furnace After cooling, the target bipolar plate is obtained.

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Abstract

The invention belongs to the field of material preparation, and in particular relates to a graphite-based conductive composite material used as a bipolar plate of a proton exchange membrane fuel cell and its preparation. The composite material is composed of conductive aggregate, binder and reinforcing filler; by weight percentage, the content of conductive aggregate is 60-90wt%, the content of binder component is 10-30wt%, and the content of reinforcing filler component is 0-20wt% . The electrical conductivity of the obtained material is 150‑420S cm ‑1 , Bending strength 40‑70MPa. The invention has excellent characteristics such as low cost, high production efficiency and high product consistency, and is suitable for batch and industrial production of bipolar plates.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a graphite-based conductive composite material used as a bipolar plate of a proton exchange membrane fuel cell and its preparation. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a high-efficiency, low-pollution electrochemical energy conversion device. It has the advantages of high power density, high energy conversion rate and no pollution. PEMFC has broad application prospects in future vehicle drive power supplies, portable power supplies and household power stations. The core components of PEMFC are bipolar plates, electrolytes, diffusion layers, and catalysts. As the connecting components of the single cells in the PEMFC cell stack, the bipolar plates mainly function to isolate oxidants and fuels, evenly distribute oxidants and fuels, support membrane electrodes and connect single cells in series. Forming electronic circuits and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0213H01M8/0226
CPCH01M8/0213H01M8/0226H01M2008/1095Y02E60/50Y02P70/50
Inventor 李晓锦苗纪远
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI