Why do battery cars catch fire frequently

Overview of Few-layer Graphene as Anode Material for Lithium Battery

The few graphene layers consist of ultra-thin layers of carbon atoms arranged in a hexagonal honeycomb lattice. Graphene films produced by chemical vapor deposition (CVD) are polycrystalline in nature, with multiple small graphene domains growing and merging into a continuous film. Compared with single-layer graphene, by inserting different substances into its layered structure, fewer layers are likely to develop into materials or heterostructures. Low-layer graphene inherits the original crystal structure and properties of natural flake graphite. It has a very large aspect ratio (diameter/thickness ratio), and has excellent electrical, thermal and mechanical properties. Has excellent electrical conductivity, lubricity, corrosion resistance, high temperature resistance, etc. The specific surface area of the small layer graphene is 400~700㎡/g, and the thickness is 0.55~3.74nm. Graphene has a high specific surface area. It is easy to be uniformly combined with other materials such as polymer materials, and form a good composite interface. The company's low-layer graphene products have formed a large-scale industrial production capacity.

As an excellent basic material for the preparation of industrial-scale functional composite materials, graphene with fewer layers will play an important role in the new round of industrial revolution. Graphite flakes attached to inorganic nanoparticles can not only effectively prevent them from accumulating repeatedly during the chemical reduction process. In addition, it can also promote the formation of a new type of material with graphene as a carrier. Graphene-inorganic nanocomposite materials exhibit excellent performance and can be widely used in fields such as emissive displays, sensors, supercapacitors, batteries, catalysis, etc., and can significantly improve the performance of nanomaterials. This makes it possible for the most promising materials in nanotechnology to be widely used in industry.

The battery car has brought convenience to most residents, but the safety of the battery car has aroused social concern. It is not uncommon for battery cars to catch fire, and even cause great harm to unfortunate participants. Why do battery cars catch fire frequently? The negative electrode material of the lithium battery is the negative electrode in the lithium ion battery, which matches the positive electrode material in the lithium ion battery. The negative electrode materials in lithium ion batteries act as a host, and they reversibly allow lithium ions to intercalate/deintercalate during charge/discharge cycles. Among them, the reasons for the greatest concentration are as follows:

1. The charging time is too long

80% of electric vehicle fires occur during charging at night. If the battery is aging and the wires fall off, spontaneous combustion, short circuit and explosion are extremely likely to occur during charging, which may ignite electric vehicles parked nearby. People fell asleep during this time and there was almost no time to escape.

2. Parking space to support combustion

According to statistics, 90% of electric vehicle fire accidents occur in halls, aisles, stairwells and other places. The enclosed environment of corridors and stairs is easy to accumulate combustible materials, and it will also block fire evacuation passages.

3. Artificial modification

Many electric vehicle owners arbitrarily increase the battery capacity, increase the driving speed, and cause safety hazards. The new national "Electric Vehicle Safety Technical Code" clearly stipulates that "the nominal voltage of the battery is ≤48V". Some illegal electric vehicle sales and maintenance outlets actively cater to the demand and install 60V or even 70V batteries for citizens in violation of the regulations.

4. The main materials of electric vehicles are flammable

From a hazard point of view, the electric vehicle itself is the source of fire. There are fuel and flammable materials on the body. Once in contact with combustion-supporting materials or entering a confined space, it is easy to cause a deflagration event.

Application of Lithium Battery Anode Material

With a unique combination of novel electronic, optical and mechanical properties, graphene-based nanomaterials have been applied in energy generation and storage. For example, they are used in photovoltaic devices and batteries, sensors and flexible electronics, photodetectors, and biomedical applications (such as drug delivery, bioimaging, and tissue engineering).

Low-layer graphene has great value in energy applications, including hydrogen storage, natural gas storage, supercapacitors, and lithium batteries.

Single-layer/low-layer graphene with fewer structural defects is the most widely used cathode material for commercial lithium-ion batteries. However, graphene with a few defects is the main electrode material for supercapacitors.

In the application of supercapacitors, the number of graphene layers is small and the specific surface area is large, which is conducive to the high dispersion of nanoparticles. The excellent conductivity is conducive to the electrochemical electron transfer process of nanoparticles to the graphene substrate, which can effectively inhibit the agglomeration of supercapacitors. The passivation film phenomenon occurs during the electrochemical cycle, which improves the cycle performance of the electrode material.

Using graphene instead of traditional graphite materials will greatly improve the lithium storage capacity of the negative electrode, thereby increasing the energy density of lithium-ion batteries.

In addition, when graphene is used as the negative electrode material of a lithium ion battery, the diffusion path of lithium ions in the graphene material is shorter and the conductivity is higher, which can greatly improve its rate performance.

In terms of hydrogen storage, when some atoms (such as transition metals and alkali metals) are first adsorbed on the surface of graphene with a small number of layers, charge transfer occurs between the adsorbed additional atoms and the matrix, thereby changing the local charge density, thereby greatly improving The adsorption capacity of graphene for hydrogen is improved.

Lithium battery anode material price

The price of lithium battery anode material products varies randomly with the production cost, transportation cost, international situation, exchange rate, and the supply and demand relationship of the lithium battery anode material product market. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for lithium battery anode material product materials, please feel free to contact to obtain the latest price of lithium battery anode material products.

Suppliers of anode materials for lithium batteries

As a global supplier of anode materials for lithium batteries, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including oxides, carbides, nitrides, single metals, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.