Which is better, graphene or lithium batteries? The advantages and disadvantages of graphene battery and lithium battery. Lithium battery is composed of four major materials: positive electrode, negative electrode, diaphragm and electrolyte, and the main negative material used is graphite. Graphene has extremely strong electrical conductivity, ultra-high strength, high toughness, high thermal conductivity, etc.. It is hoped that it will replace graphite as battery anode or be used in other key materials of lithium batteries, with a view to significantly increasing the energy density and power density of lithium batteries.
From the current stage of technological development graphene batteries have not yet appeared, graphite has a layered structure, this structure sets a gate for the embedding of lithium ions, which is the decisive factor for lithium batteries to have a charging and discharging platform and high Coulombic efficiency is also one of the important factors for it to become a key material for lithium batteries.
Which is better, graphene battery or lithium battery?
①Graphene battery is a honeycomb planar film formed by carbon atoms in sp2 hybridization, a quasi-two-dimensional material with only one atomic layer thickness. It is a new energy battery developed by using the characteristics of lithium ion shuttling movement between graphene surface and electrode in a fast and large amount, and it is considered as one of the most promising materials in the future.
② Li-ion batteries are obviously more progressive compared to graphene batteries, and have a very ride lead in power characteristics, electric capacity, and charging speed. Graphite rare batteries can achieve greater capacity and faster charging speed in terms of smaller size.
③From the use point of view alone, graphene battery is fully capable of playing the role played by lithium battery in electric vehicles, it has greater storage capacity and faster charging speed, and it is also more durable than lithium battery in high temperature. Therefore, graphene battery as electric car battery is no problem.
④ At present, graphene has not yet reached the practical stage, and there is still a long way to go before mass production. The huge shortcomings of lithium batteries in terms of safety, range, environmental pollution and charging speed have begun to seriously limit the development of major high-tech industries, so many companies' R&D departments are focusing on the more advanced graphene batteries, and believe that this new battery will completely replace the lithium batteries that have been introduced for more than 26 years in the future.
Graphene battery and lithium battery advantages and disadvantages
A, the advantages and disadvantages of graphene batteries
1, graphene battery is a single atomic layer of carbon atoms consisting of a flat film, the thickness of only 0.34 nanometers, is the world's lightest and thinnest, hardest nanomaterials known, good light transmission, can be folded.
2, graphene is the world's best conductive material, the addition of graphene composite conductive powder in the traditional cell phone lithium battery, to improve the battery's multiplier charge and discharge performance and cycle life.
3, safe and stable, the new graphene polycarbonate capacitor battery, fully charged with a nail gun to short-circuit it, any reaction is not; put on fire, there will be no explosion.
4, process characteristics are not compatible, graphene specific surface area is too large, will bring a whole lot of process problems to the existing lithium-ion battery dispersion homogenization and other processes.
5, the graphene battery on the market is not a pure graphene battery, but only on the basis of lithium batteries mixed with some graphene-related technology, compared with the traditional lithium battery, it brings only a little performance improvement, coupled with the very high cost of graphene, its manufacturing process is also very high, graphene battery production process is still not mature enough, it is currently only in the laboratory stage Can not reach the point of mass production.
Second, the advantages and disadvantages of lithium batteries
1. high energy density, its bulk energy density and mass energy density of up to 450W.h/dm3 and 150W.h/kg, respectively, and is still improving.
2. long service life, 100% DOD charge/discharge can reach more than 900 times; when using shallow depth (30% DOD) charge/discharge, the number of cycles has exceeded 5000 times.
3. no memory effect like Ni-Cd and Ni-MH batteries, with superior cycle performance.
4. poor compatibility with ordinary batteries, because it is generally necessary to use 3 ordinary batteries (3.6V) before lithium-ion batteries can be used as a substitute.
5. High cost, mainly because of the high price of the cathode material LiC002. With the continuous development of cathode technology, LiMn204 and LiFeP04 can be used as cathodes, which is expected to greatly reduce the cost of lithium-ion batteries.
Overall, although graphene batteries are far better than traditional lithium batteries in terms of performance, they are still unable to replace lithium batteries in the application of electric vehicle batteries. Nevertheless, the research and development of graphene battery is still continuing, and the simplification of the process and optimization of materials are the focus, and it may not be a dream to be used as an electric vehicle battery in the future.
This shows that graphene batteries have considerable potential and are the best material to replace lithium-ion batteries. Due to the poor safety and fire risk of lithium batteries, graphene batteries have become a highly anticipated and hot research direction in recent years. In addition to high safety performance of the new lithium nano tungsten oxide batteries may also become one of the most promising batteries in the future.
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