Method for dispersing micro-scale and nano-scale electrode materials

Abstract

The invention discloses a method for dispersing micro-scale and nano-scale electrode materials, which is suitable for a battery sizing agent consisting of micro-scale and nano-scale active substances, a conductive agent, an adhesive and a solvent. The method comprises the following step of: adding an organic acid additive decomposed at the temperature of 150 DEG C into the battery sizing agent in an amount of 0.1-8 percent of the total weight of the micro-scale and nano-scale active substances, the conductive agent and the adhesive. The method for dispersing the micro-scale and nano-scale electrode materials by taking the organic acid additive as a surfactant is adopted, so that micro-scale and nano-scale active substances can be dispersed more uniformly and stably, and the sizing agent is prevented from settling and can be decomposed into carbon dioxide and water at the temperature of about 150 DEG C for volatilizing, and therefore the battery capacity is increased effectively, the primary efficiency of the battery is improved and the cycle life of the battery is prolonged; the surface tension of the active substances can be reduced, the using amount of the solvent is reduced under the same sizing agent viscosity condition, and the cost is saved; and the adhesive properties of a coated electrode and a current collector can be enhanced, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to the production of lithium-ion battery electrode materials, in particular to a dispersion method for micron nanoscale electrode materials. Background technique [0002] In order to improve the high-current charge and discharge performance of lithium-ion batteries to meet the requirements of high-power characteristics such as hybrid electric vehicles, nano- and micronization of positive and negative electrode materials is a way. On the one hand, it can shorten the migration of lithium ions in the electrode material particles. On the other hand, it can increase the specific surface area of ​​the electrode material, so that lithium ions can be intercalated and deintercalated in the electrode material in multiple ways, thereby improving the high-current charge-discharge capability of the electrode. However, nanometerization or micronization of electrode materials brings a new problem. Due to the small particle size of nanometer-scal...

AI Technical Summary

Problems solved by technology

Tang Zanqian and others used the high-speed dispersion method to conduct a dispersion test on the nano-micron lithium iron phosphate cathode slurry. The results showed that the electrode preparation requirements can be met, but this method has high requirements for equipment, and super strong shear during the high-speed dispersion process. Shear force may cause damage to the structure of the material itself

At present, some material manufacturers have developed special surfactants to disperse nano-micron-scale materials. The method of chemical dispersion can change the surface state of nano-micron-scale materials and reduce the surface energy, so as to achieve the purpose of dispersing using conventional equipment. However, the cost of these surfactants is high, and more importantly, the residual surfactants in the electrodes may cause side reactions inside the battery, affecting the final performance of the battery

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