What are the characteristics of lithium battery anode materials?

Graphene is a two-dimensional crystal composed of carbon atoms with a thickness of only one layer of atoms. It is widely praised by scientists because of its thin texture, high hardness and fast electron movement, and is known as the king of new materials. Although the king’s excellent chemical performance is favored by the new energy market, it is still at the conceptual stage so far. 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. 2. Artificial graphite At present, the negative electrode materials are mainly natural graphite and artificial graphite. These two kinds of graphite have their own advantages and disadvantages. Natural graphite has a higher gram capacity, simple process and low price, but has poor liquid absorption and circulation performance; artificial graphite has a more complicated process and more expensive price, but has better circulation and safety performance. Through various means of technical improvements, both of these graphite anode materials can make use of their strengths and avoid weaknesses, but for the time being, artificial graphite has certain advantages when used in power lithium batteries. 3. Mesophase carbon microspheres Mesophase carbon microspheres have a highly ordered layered stacking structure, which is a typical soft carbon, with a high degree of graphitization, stable structure and excellent electrochemical performance. The mesophase carbon microspheres have higher rate performance than natural graphite and artificial graphite, and they have distinct advantages when used in aircraft models and power tools. In addition, its thermal stability and chemical stability determine that it is not prone to chemical reactions, and the use of lithium batteries increases safety guarantees. 4. Silicon-carbon composite materials By adding 10% silicon-based materials to artificial graphite, Tesla makes the battery capacity reach more than 550mAh/g, and the battery energy density can reach 300wh/kg. At present, this method of using silicon-carbon composite materials to improve the energy density of lithium batteries is one of the recognized directions in the industry. 5. Carbon Nanotube Carbon nanotube (CNT) is a special carbon material with a relatively complete graphitized structure. It has excellent electrical conductivity and high thermal conductivity. Due to its special structure, the negative electrode has a small depth, short stroke, and fast speed when releasing lithium, and has less polarization use during high-rate and high-current charge and discharge, which can improve the high-rate and fast charge-discharge performance of lithium batteries. helpful. However, when carbon nanotubes are used directly as anode materials for lithium batteries, there will be outstanding problems such as high irreversible capacity of lithium batteries, low coulombic efficiency of the first charge and discharge, unclear charge and discharge platforms, and serious voltage lag. 6. Lithium titanate Lithium titanate (LTO) is considered to be a safer and longer-life negative electrode material than carbon. Lithium titanate anode has the advantages of rapid charge and discharge, many cycles and high safety, and its prospects are optimistic by many people in the battery industry and companies. The advantages of using lithium titanate as the negative electrode of a lithium battery are as follows: First, higher safety. The magical physical properties of lithium titanate make it have high safety features that traditional lithium batteries do not have. The reaction activity between the lithium titanate and the solvent in the electrolyte is low, and the SEI insulating passivation film is basically not formed on the surface, which greatly improves the chemical stability and safety performance of the lithium battery. In a higher temperature environment, lithium titanate can absorb the oxygen generated by the positive electrode analysis, which reduces the risk of thermal runaway and improves the safety performance of the lithium battery. At the same time, the lithium titanate negative electrode fundamentally eliminates the occurrence of metal lithium dendrites on the negative electrode, and greatly reduces the risk of short circuit inside the lithium battery. Secondly, the lithium titanate negative electrode lithium battery has a long life. Lithium battery anode materials grasp the lifeblood of power lithium-ion battery safety. In lithium battery anode materials, in addition to graphitized mesophase carbon microspheres (MCMB), amorphous carbon, silicon or tin occupy a small market share, natural graphite and Artificial graphite occupies more than 90% of the negative electrode material market share. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to repair the Ni-MH battery