Product presentation
In today's energy system, large scale energy storage is becoming more and more important. And among all the key materials, graphite - especially high purity graphite bipolar plates - is getting a lot of attention as a core component in energy storage systems. With its special performance advantages, this material has brought real technological breakthroughs to the whole energy storage industry.
Product position
In electrochemical energy storage devices, the bipolar plates are referred to as the "heart" of the system, performing several crucial functions. They not only need to provide a good conductive path to ensure uniform current distribution, but also must have sufficient structural strength to support the entire stack, and must be able to resist the corrosion of the electrolyte to ensure the stability of long-term operation.
The unique feature of high-purity graphite bipolar plates lies in their outstanding comprehensive performance. Compared with other materials, graphite has excellent electrical conductivity, with an electrical conductivity of up to 150-200 S/cm, approaching the level of some metal materials. At the same time, graphite material exhibits excellent chemical stability, maintaining its performance without degradation in strong acid or strong alkali environments. Moreover, graphite has good thermal stability, capable of adapting to the heat changes generated during operation.
Product Parameter
| Performance Indicator | Unit | Value |
|---|---|---|
| Resistivity | mΩ·cm | 0.66 |
| Sheet Resistance | mΩ·cm² | 40 |
| Contact Resistance | mΩ·cm²@0.096MPa | 47.1567 |
| Density | g/cm³ | 1.94 |
| Fracture Strength | MPa | 33.69 |
| Shear Strength | MPa | 39.25 |
| Bending Strength | MPa | 64.01 |
Note: 0.096MPa is approximately equal to 20% compression rate
Product Feature
The main feature of the high-purity graphite bipolar plate is its purity. The higher the purity, the better the product efficacy will be. Generally, the carbon content of graphite products is 99.5% or 99.9%. When the carbon content reaches four nines (99.9%) or five nines (99.999%), it becomes what we call high-purity product. Using such pure graphite for production and manufacturing, the graphite plate will possess many characteristics, such as heat conductivity, electrical conductivity, corrosion resistance, and stability.
Application fields
I. Chemical and Metallurgical Industry
Electrolytic cells and reactors: In the chlor-alkali industry, graphite is commonly used as the electrode material for electrolytic cells. The thing is, its excellent corrosion resistance lets it stand up to those harsh strong acid and alkali environments, which in turn helps extend the service life of the equipment a lot.
Metallurgical equipment: It's also used as casting molds or high-temperature protective covers. What makes it stand out here is its strong thermal stability-it can handle temperatures over 2000°C easily, and that's really crucial for smooth metal smelting processes.
II. Power Equipment Manufacturing
High-voltage switches and circuit breakers: Thanks to its good conductivity and solid mechanical strength, graphite has become an ideal choice for high-voltage power equipment. For example, it can help reduce arc loss in circuit breakers, making the equipment work more efficiently.
Energy storage systems: In supercapacitors and lithium-ion batteries, graphite acts as an electrode material. This actually helps boost the energy density of the batteries and improves their charging and discharging efficiency too.
III. Environmental Protection and Resource Recycling
Wastewater treatment: In electrochemical wastewater treatment devices, graphite works through catalytic oxidation to break down pollutants. This not only treats the wastewater effectively but also helps cut down on treatment costs.
Hydrogen production and energy storage: With the large-scale development of water electrolysis for hydrogen production, the demand for graphite is keep increasing-especially in renewable energy storage systems, where it plays a key role.
IV. New Energy and Emerging Technology Fields
Lithium-ion batteries and supercapacitors: In battery power sources, graphite's high specific surface area and good conductivity make the process of lithium-ion insertion and removal smoother, which optimizes the overall efficiency of the batteries.
Solar cells: In the photovoltaic field, it's used as an electrode support structure. This not only helps improve photovoltaic conversion efficiency but also, due to its good weather resistance, allows it to adapt to complex outdoor environments, reducing the need for frequent maintenance and related costs.
V. Aerospace and Medical Equipment
Lightweight and High Strength: In spacecraft components, graphite is replacing traditional metal materials. This not only reduces the overall weight of the spacecraft but also enhances its heat resistance, which is essential for space operations.
Biocompatibility: When it comes to medical devices like implantable sensors, graphite materials are non-toxic and corrosion-resistant-these properties make them perfect for long-term use in the human body.
Technical Challenges
Although graphite bipolar plates have many advantages, they still face some technical challenges. The brittleness issue has always been a problem for the application of graphite materials, especially in large-scale fuel cells, where the bipolar plates need to withstand considerable assembly pressure.Another challenge is cost control. The price of high-purity graphite raw materials is relatively high, and due to the requirements for precise processing, the cost of the bipolar plates accounts for a significant proportion of the total system cost.
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