What effect does the cathode material have on the performance of lithium iron batteries?

What effect does the cathode material have on the performance of lithium iron batteries? The higher the thermal stability temperature, the weaker the oxidation ability and the safer the material. Currently, cathode materials for lithium-ion batteries are already on the market, including products such as lithium cobalt oxide, lithium manganate, lithium iron phosphate, and ternary materials. Lithium-ion battery cathode materials have a broad market and the prospects are very optimistic. What effect does the cathode material have on the performance of lithium iron batteries? Battery energy density Each cathode material has its theoretical energy density. If you choose the cathode material, you have chosen the upper limit of the energy density of the battery. In the process of designing and manufacturing the cathode material, the energy density of the battery is also affected by the amount of cathode material. (2) Battery power density Different types of cathode materials determine the general range of battery charge and discharge power. Some details of the material as an auxiliary factor will also affect the power characteristics. Such as the stability of the crystal structure of the cathode material, particle size, doping atoms, carbon coating process, material preparation method, etc. The above factors ultimately affect the power density of lithium-ion batteries, the ability of the cathode material to accommodate lithium ions, and the smoothness of the embedding channel. (3) Cell cycle life has many factors that affect cell cycle life. As with the positive electrode material, it is important to include the loss of active materials in the recovery of the positive electrode material, and the collapse of the material structure during the lithium ion charging and discharging process of the positive electrode caused by the attenuation of capacity. . Impurities in the cathode material, such as elemental iron and ferric iron, interact with the electrolyte and cause unfavorable side-uses or cause internal micro short circuits. Lithium iron battery. JPG What is a cathode material for lithium-ion batteries? ●Lithium cobalt oxide (LCO): suitable for small batteries, the actual capacity is not high. Lithium cobalt oxide is the first-generation commercial cathode material. After decades of development, it has been continuously improved and improved. perfect. It can be considered as the most mature cathode material for lithium iron batteries. Lithium cobalt oxide has the advantages of high discharge platform, large specific capacity, good cycle performance, and simple synthesis process. However, this material contains more cobalt, and the cost is higher. Currently, most 3C electronic batteries still use lithium cobalt oxide, rather than higher capacity ternary materials. The reason is that lithium cobalt oxide has a higher density than ternary materials, that is, it can hold more lithium cobalt oxide per unit volume. Lithium cobalt oxide occupies a place in small batteries, and its bulk density is more important. ●Lithium iron phosphate (LFP): Low energy density and good safety. Lithium iron phosphate battery is currently one of the cathode materials that has attracted much attention. The theoretical specific capacity is 170mAh/g, and the actual specific capacity is greater than 150mAh/g. Its important characteristics are low cost, good safety, and high cycle life. These characteristics make lithium iron phosphate materials quickly become a research hotspot, and lithium iron phosphate batteries have also been widely used in the field of electric vehicles. ●Ternary materials (NCM, NCA) Ternary materials are commonly known as lithium nickel cobalt manganese oxides (linixcoymn1-x-y02), and their structure is very similar to lithium cobalt acid. This material can be balanced and adjusted in terms of specific energy, circulation, safety and cost. The different configurations of the three elements will bring different properties to the material: the increase of nickel content will increase the capacity of the material, but it will make the cycle performance worse; the presence of cobalt can make the material structure more stable, but the content is too high Will reduce capacity; the presence of manganese can reduce costs and improve safety performance, but too high content will damage the layered structure materials, so the ratio of three materials found to achieve comprehensive performance optimization, the focus of ternary lithium-ion battery materials Research and Development. How important is the positive electrode material to lithium? Lithium-ion batteries are mainly composed of positive electrode material, negative electrode material, separator and electrolyte. The cathode material occupies a high proportion of the total cost of lithium ion batteries, and the performance of the cathode material directly affects the performance indicators of the lithium ion battery, so the use of the cathode material in the lithium ion battery is self-evident. 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: Introduce lithium-ion battery separator coating technology and methods