The core of lithium-ion batteries is to find and select high-energy lithium storage electrode materials. At present, the traditional lithium-ion battery electrode materials have low utilization rate, slow diffusion of lithium ions, large polarization, etc., which restricts the performance of lithium-ion batteries. So how do you improve the performance of lithium-ion batteries?
Lithium iron phosphate materials are widely used in lithium ion batteries due to their unique physical and chemical properties. They have the advantages of reduced polarization, increased charge and discharge current density, improved discharge capacity and cycle stability, and are advantageous for high performance and large capacity. The development of high-power batteries, the sintering technology of lithium iron phosphate materials is an important development direction. Researchers from all over the world have done a lot of research on nano-electrodes, and have made great progress. Some scientific research results have become mature. The most typical example is the lithium iron phosphate cathode material of the pilot line and the final test line after the mature of Fenggu energy-saving sintering technology. Lithium iron phosphate has low conductivity and low diffusion coefficient, which limits its Widely used in lithium-ion batteries.
After nano-crystallization of lithium iron phosphate material, the charge-discharge performance of the battery is significantly improved. The smaller the particle size of lithium iron phosphate, the smaller the depth and range of lithium ion deintercalation, the higher the diffusion rate; the larger the specific surface area, the more the reaction interface Larger, the faster the lithium ion diffusion channel provided by the grain boundary. The smaller the particle size, the higher the utilization rate, the smaller the irreversible capacity, the denser the nanoparticles. The gap between the lithium iron phosphate particles reduces the lithium ion during the deintercalation process. Stress. These characteristics help to improve the high rate charge and discharge performance of LiFePO4 batteries. A123 Systems was founded in 2001, and its lithium iron phosphate nanomaterials and power batteries quickly became the star of the battery industry. The advantage of A123 is that it is possible to produce uniformity. The nano-sized ultra-small particles (reported to be less than 100 nm) of lithium iron phosphate cathode material, due to the sharp increase in granules and total surface argon, greatly improve the high discharge power of the battery. EA and overall stability and cycle life are not affected .
