Titles:
Sodium supplementation materials and preparation methods thereof, positive electrode plates, electrode assemblies, batteries and electrical devices
补钠材料及其制备方法、正极极片、电极组件、电池和用电装置
Abstracts:
The present invention relates to the field of battery technology, and in particular to a sodium-supplementing material and a preparation method thereof, a positive electrode plate, an electrode assembly, a battery and an electrical device. The sodium supplementing material includes a sodium supplementing agent and a coating layer provided on the surface of the sodium supplementing agent. The coating layer includes a lattice oxygen stabilizing material and/or an oxygen adsorbing material. The lattice oxygen stabilizing material can stabilize the structure of the sodium supplement agent, improve the release of lattice oxygen, and reduce the amount of oxygen released. The oxygen adsorption layer can filter the released oxygen and reduce the oxygen entering the electrolyte. Through the lattice oxygen stabilizing material and/ Or oxygen adsorbing materials can improve the release of oxygen from sodium-supplementing materials and improve battery performance.
Titles:
A kind of nickel iron manganese based sodium ion battery precursor and its preparation method and application
一种镍铁锰基钠离子电池前驱体及其制备方法和应用
Abstracts:
The invention relates to the technical field of sodium ion batteries and provides a nickel iron manganese based sodium ion battery precursor and its preparation method and application. The chemical formula of the nickel iron manganese based sodium ion battery precursor is NixFeyMnzZnwOH2, x+y+z+w=1 , 0.1≤x≤0.2, 0.25≤y≤0.35, 0.5≤z≤0.6, 0.001≤w≤0.002, D50 is 4‑6μm, TD is 0.8‑1.2g/cm3, BET is 30‑60m2/g, Na< 0.008%, S<0.1%, high BET, high internal void distribution, P2 type layered oxide can maintain high cycle characteristics, enhance conductivity, increase sodium ion deintercalation rate, and improve battery charge and discharge efficiency. During preparation, control the flow rate, ammonia value, pH, temperature, etc. of the nickel-iron-manganese-zinc salt mixture, and improve the post-treatment process.
Titles:
A method to improve the first Coulombic efficiency and energy density of sodium-ion batteries, positive electrode slurry, positive electrode sheet and sodium-ion battery
一种提升钠离子电池首次库伦效率和能量密度的方法、正极浆料、正极片和钠离子电池
Abstracts:
The invention discloses a method for improving the first Coulombic efficiency and energy density of a sodium-ion battery, a positive electrode slurry, a positive electrode sheet and a sodium-ion battery, belonging to the field of sodium-ion batteries; the method includes the following steps: combining a binder and an organic solvent Perform the first mixing to obtain the binder glue; perform the second mixing of the positive active material, conductive agent and sodium bicarbonate to obtain a mixture; first add part of the binder glue to the mixture, and then add the remaining adhesive after kneading. The binder glue liquid is subjected to the third mixing to obtain the cathode slurry; wherein the weight of the sodium bicarbonate is 1.5% to 4.5% of the total weight of the binder, organic solvent, cathode active material, and conductive agent. The present invention uses sodium bicarbonate as the sodium supplement additive, which can effectively supplement the Na+ consumed in the battery system without affecting the battery formula ratio. It can also effectively avoid the problem of slurry gel caused by directly using sodium carbonate as the sodium supplement additive. .
