Nanometer zirconia application in lithium cobalate materials shared today

In order to make lithium cobalate cathode material show good performance in the process of charge and discharge, in addition to doping to inhibit the phase transformation of charge and discharge structure, surface coating is also an effective method to improve the chemical properties.  

Nano zirconia powder application

In 1999, LiCoO2 was coated by oxide or phosphate coating.  The increase of LiCoO2 specific capacity to 170 mAh/ GO capacity is due to the greatly reduced reactivity of Co4+ and HF(the product of LiPF6 and water reaction) in the electrolyte under charging state.  JCho et al. believed that the reaction between the coating layer and LiCoO2 or the thin layer could inhibit the LiCoO2 lattice expansion when the material circulates between 2.75 and 4.4V. Because the fracture toughness of the oxide decreased in the order of Zr02 > A1203 > Ti02 >B203, the coating effect of ZrO2 was better.  Zhaohui Chen and J. R. Dahn believed that the capacity attenuation of LiCoO2 when charged to 45 V was the reason for the increase of the surface impedance of LiCoO2 in lipF6-based electrolyte.  Therefore, the increase of impedance can be inhibited by oxide coating, grinding (or simple heat treatment in air to obtain fresh LiCoO2 surface or LiBOB instead of LiPF6.  

Nanometer zirconia VK-R30D powder for battery has fine particle size, uniform particle size distribution, no hard agglomeration and good sphericity.  In the production, we can control the content of each component, realize the even mixing of particles between different components, control the size, shape and structure of particles, and ensure the quality of products.  

Both microdoping and coating nano-zirconia VK-R30D can improve the comprehensive performance of lithium cobalate and greatly improve its cycling performance, but so far, lithium cobalate is far from reaching its theoretical capacity.  A large number of studies show that doping nano zirconia VK-R30D can effectively improve the performance of lithium cobalt oxide, using a variety of elements for joint doping, from the crystal structure to improve, make it has a more complete crystal structure, more stable crystal structure, so as to improve the specific capacity of lithium cobalt oxide;  At the same time, it can improve the conductivity of lithium cobalt acid and improve the cycling performance and physical processing performance.  

With the rapid development of lithium ion battery cathode materials, the competition is increasingly fierce.  At present, the actual capacity of commercial lithium cobaltate is only 50% of the theoretical capacity, which has great potential for improvement.  In order to improve its reversible capacity and cyclic performance, further study of the structure of lithium drill, deeper optimization and improvement of synthetic methods, looking for new element doping, study the synergistic effect of various elements, multi-component doping, so as to improve the specific capacity and cyclic performance of lithium cobalt acid, to reach a large range of commercial.