What are the common positive and negative materials for lithium batteries?

Common cathode materials for lithium batteries With the continuous development of lithium batteries, the application fields are gradually expanding. The use of cathode materials has changed from singularity to diversification, including: olivine-type lithium iron phosphate, Layered lithium cobalt oxide, spinel lithium manganate, etc., realize the coexistence of multiple materials. Among the cathode materials for lithium batteries, the most commonly used materials are lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate and ternary materials (a polymer of nickel, cobalt and manganese). 1. Lithium cobaltate was used as a cathode material for the earliest time, and it is still the mainstream cathode material in consumer electronics products. Compared with other cathode materials, it can be seen that the voltage of lithium cobalt oxide is higher during the working process, and the voltage runs more smoothly during charging or discharging, and it can meet the requirements of large currents. It has strong cycle performance and high conductivity. And the process of lithium battery is relatively stable. 2. The ternary cathode material has a more significant ternary synergistic effect. Compared with lithium cobalt oxide, it can be seen that there are greater advantages in thermal stability, and the processing cost is relatively low, which can be the best for lithium cobalt oxide Substitute materials. However, its density is low and the cycle performance needs to be improved. In this regard, it can be adjusted by improving the synthesis process and ion doping. 3. Lithium iron phosphate has good cycle performance and thermal stability in charging and discharging, and has a strong safety guarantee during use, and the material is green and environmentally friendly, and will not cause serious damage to the environment. At the same time, the price is also It is relatively inexpensive and is considered by the battery industry in my country to be the best material for processing large-scale battery modules. What are the common anode materials for lithium batteries? In the lithium battery materials, the negative electrode material is an important component, which can have a greater impact on the performance of the overall lithium battery. At present, anode materials are mainly divided into two categories, one is carbon materials for commercial applications, such as natural graphite, soft carbon, etc., and the other is a non-carbon anode material that is in the state of research and development, but the future direction is very good. For example, silicon-based materials, alloy materials, tin-gold materials, and so on. The negative electrode of a lithium battery is made by mixing the negative active material carbon material or non-carbon material, binders and additives to form a paste glue that is evenly smeared on both sides of the copper foil, dried and rolled. The negative electrode material is the main body of the lithium battery to store lithium, allowing the insertion and extraction of lithium ions during the charging and discharging process. When a lithium battery is charged, the lithium atoms in the positive electrode are ionized into lithium ions and electrons, and the lithium ions move to the negative electrode to synthesize lithium atoms with the electrons. During discharge, lithium atoms are ionized from the surface of the negative electrode in the graphite crystal into lithium ions and electrons, and lithium atoms are synthesized at the positive electrode. ●Carbon anode material This type of material is a balanced anode material in terms of energy density, cycle capacity, or cost input. It is also an important material that promotes the birth of lithium batteries. Carbon materials can be divided into two major categories. Category, namely graphitized carbon material and hard carbon. Among them, the former mainly includes artificial graphite and natural graphite. ●Natural graphite Natural graphite also has many advantages. Its crystallinity is higher, there are more places where it can be embedded, and the price is lower, making it an ideal lithium battery material. However, it also has certain disadvantages, such as poor compatibility when reacting with electrolyte, and many defects on the surface during pulverization, which will greatly adversely affect its charging or discharging performance. 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 post: What are the reasons for the fire and explosion of lithium batteries?