Analysis of advantages and disadvantages of graphene batteries

Graphene is a thin film of the honeycomb composed of carbon atoms by sp2 hybridization. It is a kind of only one atomic layer thickness of the 2D material, so they are called single atomic layer of graphite. Its thickness is about 0.335 nm. Because different preparation methods have different ups and downs, the height is about 1 nm in the vertical direction, and horizontal width is about 10 nm to 25 nm. It is the basic structure of all crystal units except diamond carbon (zero dimensional fullerenes, one dimensional carbon nanotubes, three-dimensional graphite).

The application of graphene in the field of energy

Among these, the application of graphene in the field of energy is the hottest, also be the most promising direction. In principle, graphene as a kind of ideal two-dimensional conductive material, to join lithium ion batteries the anode material (lithium iron phosphate, etc.), which can improve the electrical conductivity of electrode material, and the positive nanoparticles can package, is to the existing "carbon black and carbon nanotubes" upgrading of conductive agent.

Join the graphene conductive agent the lithium battery, its ratio performance, consistency, and life has different levels of the advantages (this is).

In addition, graphene can also be added to the new anode materials (intermediate phase carbon microspheres, etc.), improve the performance of the electrode materials, is also a possibility of future development.

Although these applications than lithium the battery the core technology, right lithium electricity capacity and density also have no big improvement, but can improve the comprehensive performance of battery and new energy vehicles, technical maturity is higher in the application of the graphene is the direction.

Graphene batteries, the use of lithium ion in graphene quickly a large number of shuttle between the surface and the electrode movement features, developed a kind of new energy battery.

The basic principle of graphene battery: graphene battery in saturated copper chloride solution, time (hours, days) and the relationship between the voltages.

Experiments made circuit containing led wire connection to the ribbon graphene. They just put graphene on copper chloride (copper chloride), in the solution. LED lights are up. In fact, they need 6 graphene circuit, formed in series, so that it can produce the required 2 v, the LED lights shine, can get the picture.

Schee and colleagues say, and what is happening here is copper ions with dual positive charge, through the solution speed is about 300 meters per second, because of the heat energy solution at room temperature. When ion violent bump into ribbons, collisions would produce enough energy to make is not in the in situ electron out of graphene. Electronic has two options: can leave ribbons, and copper ion combination, also can through the graphene, into the circuit.

Originally, the flow of electrons in graphene faster, than it through the solution speed, so electronic will naturally choose path, through the circuit. Is this a little bit bright LED lights "electronic tend to release through the surface of graphene, rather than into the electrolyte. Equipment that generate voltage, "said schee.

Therefore, the device can produce heat from the surrounding environment of energy. They can improve the current, heating the solution, and it also can use ultrasonic speed copper ions. Only rely on the surrounding heat, can make their graphene battery run 20 days. However, there is an important question. Another hypothesis is that some kind of chemical reaction to produce current, just like an ordinary battery.

Schee, however, and his colleagues say they ruled out this, because of several groups of control experiment was carried out. However, these are introduced in some supplementary material, and they seem to be not on arXiv website. They need before the others make a solemn statement made public. Value of the face of it, it seems to be a very important achievements. Others also produced current in graphene, but just let the water flow through it, so it doesn't really make the person surprise, mobile ions can also produce such effects. This heralds a clean green battery, relying only on heat driven environment. Schee and colleagues said: "this represents a huge breakthrough, study is the drive technology".

The advantages and disadvantages of graphene battery:

Advantages:

1) The storage battery is three times the market at present the best products. A lithium battery (will be subject to the most advanced) than the energy value of 180 wh/kg, while a graphene battery than energy than 600 wh/kg.

2) With the batteries provide power of the electric car driving up to 1000 kilometers, and the charging time is less than 8 minutes.

3) Long service life. Its service life is four times the size of the traditional hydride batteries, lithium battery is twice as much.

4) Light weight. Graphene feature makes the weight of the battery can be reduced to half of the conventional batteries, so that we can improve the efficiency of loading machine of the battery.

5) The cost is low. The battery production, the company said its cost will be 77% lower than a lithium-ion battery."

"Stability is high, long battery life, charging speed;

Disadvantages:

The traditional conductive carbon/graphite is very cheap, and is sold by tons, but graphene is too expensive. A gram of graphene sold over thousand, this is not a general enterprise can bear. A couple of years ago, the price of graphene was as high as 5000 yuan per gram, far above the price of gold. The ordinary consumers are unbearable.

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