Graphene BMC Bipolar Plates With Higher Through-Plane Conductivity
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Solution Overview
Problem
Current bipolar plates in fuel cell stacks face challenges in achieving high through-plane electrical conductivity while maintaining mechanical stability, corrosion resistance, and processability, which are essential for efficient and cost-effective manufacturing.
Innovation Solution
Incorporating graphene nanoplatelets into vinyl ester-based bulk molding compounds (BMCs) to enhance through-plane electrical conductivity, mechanical stability, and corrosion resistance, thereby improving the performance and durability of bipolar plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal materials such as stainless steel are used for bipolar plates, then electrical conductivity can meet DOE goals, but weight, cost, and corrosion resistance deteriorate
Solution Approach 1:
The patent uses composite materials consisting of polymer matrices (thermoplastic or thermoset resins) filled with conductive additives such as graphite particles or fibers. This composite approach achieves electrical conductivity greater than 100 S/cm while maintaining the lightweight advantage of polymers, thereby resolving the contradiction between electrical conductivity and weight.
2Weight of moving object
If machined graphite plates are used, then weight and corrosion resistance improve, but through-plane electrical conductivity deteriorates
Solution Approach 1:
The patent changes the physical and chemical parameters of the composite material by incorporating conductive additives with specific properties (graphite particles or fibers) into polymer matrices. This parameter modification enables the material to achieve through-plane electrical conductivity greater than 100 S/cm while maintaining low weight, resolving the contradiction between weight and electrical conductivity.
3Reliability
If excessive amounts of conductive additives are incorporated into polymer resins, then electrical conductivity improves, but viscosity increases making processing difficult
Solution Approach 1:
The patent optimizes the concentration parameter of conductive additives within a specific range (5-80 wt%) to achieve the desired electrical conductivity while maintaining acceptable viscosity for processing. This parameter optimization resolves the contradiction between electrical conductivity and processability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The incorporation of graphene nanoplatelets increases through-plane electrical conductivity by up to 100% and maintains or improves mechanical properties such as strength and processability, making the BMCs suitable for thin, lightweight bipolar plates that meet the DOE's conductivity goals and retain dimensional stability.
Implementation Method 1
Incorporating graphene nanoplatelets into vinyl ester-based bulk molding compounds (BMCs) to enhance through-plane electrical conductivity
Data Source
AI summary
Thermoset bulk molding compounds (BMC) useful for making electrically conductive components such as bipolar plates for fuel cells are described. The thermoset bulk molding compounds incorporate graphene nanoplatelets to increase the through-plane electrical conductivity by at least 20% compared to BMCs without the graphene nanoplatelets. Additionally, these compositions have low shrinkage, low density for lightweight parts, and are easily processed. The compositions can be used to prepare a variety of electrically conductive components, including bipolar plates for fuel cells and chemical storage batteries that operate at temperatures of less than 100° C.