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Application Of Graphene Conductive Agent In Battery
- Apr 02, 2018 -

1. the application of graphene conductive agent in the battery

The battery conductive agent is a key auxiliary material for positive and negative electrode materials and electrode interconnections, and has a great influence on the number of charge and discharge times, internal resistance, and power performance of the battery. Graphene is a new type of carbon material that has been researched in recent years. It has excellent electrical conductivity and rate performance. It can be applied to lithium ion battery materials, lithium sulfur batteries and lead acid, and can greatly increase the battery capacity and Large rate charge and discharge performance.

Application of Graphene in Lithium Ion Power Battery

In the current existing lithium ion battery system, the positive and negative electrode materials used by the battery itself have lower ion and electron conductivity, which is the main factor that affects and limits the charge and discharge cycle and rate performance of the lithium battery. An excessively high resistance value of the positive and negative electrode materials may cause polarization of the electrode plate, which directly leads to a rapid decrease in the utilization rate of the lithium battery electrode material and a rapid attenuation of the cycle performance of the lithium battery.

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In order to establish an efficient battery anode and cathode material conductive network and structure, it is necessary to add an efficient battery material conductive agent, and the electrode material conductive agent of the morphology, performance and the amount of high requirements, the need for a suitable matching relationship. Among them, the conductive agent itself does not have the characteristic of providing lithium-intercalation capacity, which leads to a small decrease in specific energy and specific power capability of the entire lithium battery system.

Therefore, there is an urgent need to develop a new type of battery conductive additive material that can provide a highly efficient conductive network. This new type of conductive agent material can significantly increase the electrical conductivity of the positive and negative electrodes while reducing the required amount of addition, thereby reducing the cost of the battery, and Can improve the lithium battery rate and charge and discharge cycle performance.

2. Graphene conductive agent in lithium sulfur batteries

Lithium-sulfur (Li-S) batteries have a very high theoretical energy storage density of 2,600 Wh/kg, which is 5 to 10 times that of the most advanced lithium-ion batteries and is expected to be used in large quantities in future energy storage systems and devices.

At present, graphene conductive agent is the mainstream of lithium battery conductive agent. Graphene materials prepared by different methods can exert different effects when used as a conductive support skeleton structure in a lithium-sulfur battery system.

The graphene material itself has unique physical and mechanical properties, and can also provide a rich three-dimensional buffer space for the huge volume change produced by the sulfur active material in the process of releasing lithium. These characteristics of the graphene conductive agent further effectively improve the circulation of the lithium-sulfur battery. Safety, rate performance, and cycle life.

 

3. The application of graphene in lead-acid batteries

The lead-acid battery is the oldest secondary battery in development history and is the world's first commercial rechargeable rechargeable battery.

There is also a great deal of use and production of lead-acid batteries. The lead-acid battery electrode is mainly made of lead and its oxide material, and the electrolyte is sulfuric acid solution. In the battery discharge state, the main component of the positive electrode material is lead dioxide, and the main component of the negative electrode material is lead. Under the state of battery charge, the main components of the positive and negative electrodes are lead sulfate.

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Lead acid battery structure

The application of graphene in the field of lead-acid batteries belongs to the stage of in-depth research and trial application. There have been a large number of R&D teams of scientific researchers and companies involved in this field, and there have been phased results and breakthroughs. The effect of graphene on the performance of lead-acid batteries can not be ignored, and it has become one of the new hotspots in the direction of lead-acid batteries.

Because of its unique structure and excellent performance, graphene is destined to become a research hotspot in the field of batteries. According to current research results, graphene conductive agents can be applied to the traditional lead-acid batteries and lithium batteries to solve the problem of battery energy density and power density are difficult to have both, the graphene conductive agent will be more and more applied to the battery industry in the future . The application of graphene conductive agent in lithium ion batteries is a very promising direction and future development trend.