The advantages of graphene as a negative electrode material for lithium-ion batteries. Important anode materials for lithium-ion batteries include tin-based materials, lithium-based materials, lithium titanate, carbon nanomaterials, graphene materials, and so on. The high electrical conductivity, high thermal conductivity, high specific surface area, and many other excellent characteristics of graphene batteries have a very important theoretical and engineering value to deal with this problem to a certain extent. The following editor analyzes the advantages of graphene as a negative electrode material for lithium-ion batteries.

The advantages of graphene as a negative electrode material for lithium-ion batteries

1. Graphene has a large specific surface area (2630m2/g), which can reduce the polarization of lithium-ion batteries, thereby reducing the energy loss caused by polarization.

2. Graphene has excellent electrical and thermal properties, that is, it has good electron transmission channels and stability.

3. The scale of graphene sheets is on the order of micro-nano, much smaller than bulk graphite, which shortens the diffusion path of Li+ between graphene sheets; the increase in the distance between the sheets is also conducive to the diffusion and transport of Li+. Conducive to the improvement of the power performance of lithium-ion batteries.

Graphene has attracted much attention in the field of energy storage due to its high electrical conductivity and thermal conductivity. Its composite material used as a negative electrode material for lithium-ion batteries has significantly improved the electrochemical performance of lithium-ion batteries.

The development prospects of graphene anode materials

Graphene has the potential to replace graphite as a new generation of negative electrode material for lithium-ion batteries due to its magical two-dimensional structure, excellent electron transport capacity, and large specific surface area. The lithium storage mechanism of graphene is similar to that of other carbon materials. When charging, lithium ions are extracted from the positive electrode and intercalated in the electrolyte to form Li2C6. When discharging, lithium ions are removed and returned to the positive electrode.

Therefore, compared to graphite, using graphene as the negative electrode is more conducive to improving battery performance. Since the concept of graphene batteries was put forward, many academic research results have stated that graphene lithium-ion batteries have a reversible capacity of more than 500mAh/g and excellent rate performance.

At present, the main anode materials are natural graphite and artificial graphite, and these two kinds of graphite have their own advantages and disadvantages. If graphene is used as a negative electrode material for lithium batteries, independent upstream and downstream industrial chains, expensive prices and complicated processes will discourage many negative electrode material manufacturers.

In the positive electrode composite material, the special structure of graphene with two-dimensional high specific surface area and excellent electron transport ability can effectively improve the conductivity of the positive electrode material and improve the diffusion and transport ability of lithium ions. Compared with traditional conductive additives, the advantage of graphene conductive agent is that it can use a smaller amount of addition to achieve better electrochemical performance. In addition, there are also reports about graphene-coated cathode materials such as lithium iron phosphate and lithium manganate.

In terms of anode materials, pure graphene materials cannot replace the current commercial carbon materials used as anode materials for lithium-ion batteries due to their low first-cycle Coulomb efficiency, high charge and discharge platform, and poor cycle stability. However, graphene can be used as an excellent matrix material in lithium-ion battery composite electrode materials to play a greater use. Combining graphene with natural graphite, carbon nanotubes, fullerenes and other carbon materials can utilize the special sheet structure of graphene to improve the mechanical properties and electron transmission capabilities of the material. At the same time, the interlayer spacing of the doped graphene sheets increases, providing more lithium storage space.

The energy density of the negative electrode material of lithium-ion batteries is one of the important factors affecting the energy density of lithium-ion batteries. Graphene batteries are a new type of carbon material formed by carbon six-membered rings. It has many excellent properties, such as a large surface area (about 2600m2g-1), high thermal conductivity (approximately 5300Wm-1K-1), high electronic conductivity (electron mobility 15000cm2V-1s-1) and good mechanical properties have attracted much attention as materials for lithium-ion batteries. Graphene has very impressive electrochemical performance when used as a negative electrode material for lithium-ion batteries.

Graphene battery is a new type of material that has been studied in recent years. It has good electrical conductivity and rate performance. It has great potential for use in the field of lithium-ion battery cathode materials and anode materials. As one of the four major constituent materials of lithium-ion batteries, negative electrode materials play an important role in improving battery capacity and cycle performance.

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