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What are the advantages, disadvantages and disadvantages of graphene batteries

2020-12-15 10:34

Description

Graphene battery: Graphene battery is a honeycomb flat film formed by sp2 hybridization of carbon atoms. It is a quasi-two-dimensional material with only one atomic layer thickness, so it is also called monoatomic layer graphite. A new energy battery has been developed by utilizing the characteristics of rapid and massive shuttle movement of lithium ions between the graphene surface and the electrodes.

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(1) Advantages of graphene battery:


The power storage is three times that of the best products on the market. The specific energy value of a lithium battery (whichever is the most advanced) is 180wh/kg, while the specific energy of a graphene battery exceeds 600whkg. An electric car powered by this battery can travel up to 1,000 kilometers, and its charging time is less than 8 minutes. long lasting. Its service life is four times that of traditional hydrogenated batteries and twice that of lithium batteries. Light weight. The characteristics of graphene make the weight of the battery can be reduced to half of the traditional battery, which can improve the efficiency of the machine loaded with the battery. Graphene has more advantages than traditional batteries. In terms of service life, its service life is twice that of lithium batteries and four times that of hydrogenated batteries. Faster charging speed and more durable than lithium batteries at high temperatures.


(2) Disadvantages of graphene battery:


Graphene has not yet reached the practical stage, and there is still a long way to go before mass production. These graphene batteries on the market are not pure graphene batteries. They just doped some graphene-related technologies on the basis of lithium batteries. Compared with traditional lithium batteries, the performance improvement it brings is only so. a little bit. In addition, the cost of graphene is very high, and its manufacturing process is also very high. The manufacturing process of graphene batteries is still not mature enough. It is currently only in the laboratory stage and cannot reach the point of mass production. Process characteristics are not compatible. That is, the excessively large specific surface area of graphene will cause a lot of process problems in the processes of dispersion and homogenization of existing lithium-ion batteries. If the battery factory adjustment process will be exhausted, and there is no sufficient profit margin driven by the breakthrough progress in performance indicators, who wants to use this technology? The surface properties of graphene are greatly affected by the chemical state, and there are many problems with batch stability, cycle life and so on. At present, it cannot meet the detailed requirements of lithium battery production.