A few days ago, Fu Can Technology announced a new battery – energy density reached 330Wh / kg.

The electrochemical system designed by advanced silicon negative material and a single-walled carbon nanotube conductive agent and a new binder formulation, effectively overcomes the problem of silicon expansion and reaches more than 1500 cycles.

Further, the cell can provide 90% capacity at a temperature of 20 ° C under zero.

Fu can apply for an authoritative testing institution to test it according to national standards, and the test cycle is expected to be approximately 3 months. After test, you can be sold.

What is the current industry level? What is the technology used?

1

What is the level in the battery industry?

330WH / kg or enterprise has developed a maximum energy density battery.

In the past few years, I have known the energy density of 300WH / kg, which is a battery monomer loaded for Tesla Model3, and the actual energy density is 256Wh / kg.

“Electric Vehicle Observer” is calculated according to the 20020 annotation certificate, and has not found that the energy density reaches 300WH / kg.

According to the calculation data, the monomer energy density is the soft bag battery of Ningde Times, reaching 279.56Wh / kg.

From the overall data, the average energy density of the soft bag battery monomer is about 200 WH / kg, and the mainstream energy density is between 240-260Wh / kg.

2020, the battery cell energy density between 207-242WH / kg is 207-242Wh / kg, and the corresponding system energy is dense in 140-170Wh / kg, and the renewal mileage of the corresponding model is 400-500 kilometers.

Taking a cylindrical battery as an example, Tesla loaded LG cylindrical battery monomer energy density at 256-257WH / kg, corresponding system energy density at 145-161WH / kg, and the renewal mileage of the corresponding model is 445-668 kilometers.

The 2020 certificate shows that the energy density of the square battery has a maximum of 250WH / kg, the system energy density is 180Wh / kg, and the renewal mileage of the corresponding model is about 500 kilometers.

If the energy density developed by Fu Can be 330Wh / kg battery, the grouping efficiency can be 70%, and the battery system energy density is expected to reach 230Wh / kg.

At present, China is known in the system energy density is the National High Text, which is equipped on Beijing BJ7000USD8-BEV pure electric car, and its battery system energy density exceeds 200Wh / kg, but its battery is only 470km.

If Vsody can produce a car this year, it may create density records in the battery and system level.

2

Carbon nanotubes: spiral graphene

Battery energy density in Fu can develop, it is obviously highlighting the current installed level, what technology does it use?

According to the bulletin announcement, it adopts silicon negative material.

Silicon has 372 mAh / g from the highest theoretical capacity of 4200 mAh / g from the negative material material.

However, silicon is characterized by high expansion, resulting in unstable lithium ion battery structure, and cycles should be attenuated. So what is stable to live this structure?

The mystery may be on a single wall carbon nanotube conductive agent.

To this end, “Electric Vehicle Observer” checks the relevant information, I hope to understand what is the sacred carbon nanotube in the end.

Review the related papers show that the relationship between single-walled carbon nanotubes and graphene is closely related.

Single-walled carbon nanotubes are composed of single-layer graphene, multi-wall carbon nanotubes are composed of two layers and above graphene.

The left side of the figure is a single wall carbon nanotube, and the right side is multi-walled carbon nanotubes.

From essentially, carbon nanotubes and graphene are graphite materials, only in combination of carbon atoms.

The graphene is peeled off from the graphite material, only a two-dimensional crystal having only one atom thickness consisting of carbon atoms, is also divided into single layer graphene and graphene microchip (multilayer structure).

That is, the spiral-shaped carbon nanotubes and sheets are graphene, so they have some of the same characteristics, such as conductivity.

At present, the low power density is the maximum disadvantage of the lithium-ion battery. When high-magnification charge is charged, the low ion migration rate and low conductivity and thermal conductivity at the internal interface of the electrode can cause the height of the lithium-ion battery electrode. .

The polarization caused by battery when charging, consumes more electrical energy; when discharges, power consumption becomes a part of the thermal energy, not only is not economical and is not conducive to fast charge.

The electron conductivity and ion conductivity of the carbon nanotubes are better, which is more advantageous to enhance the cycle of the battery, thus making up the cycle loss caused by the addition of silicon.

Specifically, due to its special tubular graphite structure and unique ballistic electron conductivity, the conductivity of carbon nanotubes at room temperature can be as high as 10000,000s / cm, and the lithium battery is used to increase the rapid embedding of lithium ions. Transmission speed. Briefly, it is very beneficial to the high power charge and discharge of the lithium battery.

For the battery system, Fu can give the reply to the high nickel ternary system.

According to industry experts, this battery is likely to be 8 Series, and the soft bag battery is likely to achieve this energy density.

3

Still need to test the stage

The Fu Can announced that, as of now, the company has the battery’s national standard security related test, such as overtilization, overprint, short circuit, and hot car, etc., can pass the test. Up to now, Fu can apply to test through the new national standard GB38031-2020 through the China Automotive Engineering Research Institute Co., Ltd., and the test cycle is expected to be approximately 3 months. After test, you can be sold.

According to Fu can introduce, this product is from a cooperation project derived from the US company in 2017. The delivery date of the project is at the end of 2020, Fu Can Technology’s project indicators in cooperation projects have only one, that is, 330WH / kg.

The battery has inside the domestic company and the US official designated laboratory. The two places have tests, the data is basically consistent, and the US acceptance is completed in December last year.

The battery energy density is more than 25% higher than that of the industry mainstream battery product, helping the whole vehicle expect to reach 1000 kilometers. The cycle performance test can reach more than 1,500 cycle life.

In Vo, high-energy density plus high cycle life, new batteries can reach millions of kilometers in the driving cycle of electric vehicles.

It is worth noting that the single-walled carbon nanotube cost of the Fu Can battery is not low, and the energy is said to date that the cost will not increase significantly after the future size is produced.

In the case of China’s soft bag battery, the cost is difficult to reduce, and the price-sensitive medium and low-end models will not be used first, and the new battery is likely to start from high-end models.

However, it is certain that after the battery is quantified, it helps Fu Can Technology to enhance the status of the industry, attract some customers to pay attention and use, thereby increasing its competitiveness and market share in China and international markets.

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