Three technologies to improve the voltage performance of lithium battery cathode materials

Three technologies to improve the voltage performance of lithium battery cathode materials. Increasing the voltage of lithium battery cathode data is a new idea to increase the energy density of lithium batteries in recent years. High-voltage data includes two types of positive electrode data: spinel-like crystal structure and olivine-like crystal structure. LiMPO4(Mu003dCo,Ni) is a typical high-pressure olivine crystal structure. Among them, the discharge potential of LiCoPO4 is 4.8v, the discharge potential of LiNiPO4 is 5.2v, and the theoretical capacity is close to 170mAh/g. 5.2v is currently the highest charge and discharge voltage, because there is no electrolyte for the game, there is no reported lithium battery function LiNiPO4 positive data, there are more LiCoPO4 data reports, but the cyclic charge and discharge function of obtaining LiCoPO4 data is very poor in the current electrolyte system. The main side uses of the crystal structure of olivine under high pressure are as follows: 1. The positive electrode data reacts with the electrolyte to form a solid-liquid interface layer; 2.2. The electrolyte will partially dissolve Co ions, which will seriously affect the cyclic charge and discharge function of the lithium battery; 3. Poor conductivity and low conductivity. Therefore, the selection of the crystal structure of high-pressure olivine must implement the necessary techniques to improve its function. There are three techniques. 1. Nanotechnology. Nanoparticles used for active materials have shorter lithium ion and electron transfer and diffusion pathways than micron-sized particles. 2. Stimulants. Unlike the spinel crystal structure that can be doped with cations and anions at the same time, the olivine crystal structure can only improve the conductivity of the positive electrode data by doping with cations. 3. Coating. The amorphous carbon coating can form interconnected electron high-speed transmission channels, thereby improving its functions, especially the first discharge capacity and the charge-discharge cycle function. LiMPO4 In general, the olivine-like crystal structure (Mu003dCo, Ni) has more theoretical capabilities than the spinel-like crystal structure. However, due to low conductivity and poor blood circulation, the developed lithium battery cathode material There is no research achievement of lithium batteries with a spinel crystal structure, and the input to the stage of industrialization requires more advanced functions to be transformed into skills. The first is the power lithium battery for electric vehicles. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Reasons and solutions for common faults in battery operation