Preparation method of aqueous high rate sodium ion battery

Abstract

The invention discloses a preparation method of an aqueous high rate sodium ion battery. The method includes the steps of: firstly taking a sodium source, a vanadium source, and ammonium dihydrogen phosphate as the raw materials to prepare a precursor, and then performing sintering at certain temperature to obtain a sodium ion battery positive electrode material; mixing the prepared sodium ion battery positive electrode material with a conductive agent and a binder, then adding the mixture into an organic solvent, and performing stirring to obtain a positive slurry, then coating a current collector surface with the slurry, and conducting drying and rolling to obtain a positive plate; then preparing a negative plate; preparing an electrolyte solution, finally superimposing the prepared positive plate, negative plate and a diaphragm, and conducting stacking winding with a winding machine into a coiled battery core, and putting the battery core in a battery shell, injecting the prepared electrolyte solution, and performing sealing to obtain the sodium ion battery. The sodium ion battery prepared by the method provided by the invention has good safety and excellent cycling performance.

Description

Technical field: [0001] The invention relates to the field of sodium ion batteries, in particular to a method for preparing an aqueous high-rate sodium ion battery. Background technique: [0002] The working principle of sodium-ion batteries is similar to that of lithium-ion batteries, using the intercalation process of sodium ions between the positive and negative electrodes to achieve charge and discharge. Compared with lithium-ion batteries, sodium-ion batteries have the following advantages: (1) Na-salt raw materials are rich in reserves and low in price. Compared with lithium-ion battery ternary cathode materials, the cost of raw materials is reduced by half by using iron-manganese-nickel-based cathode materials; 2) Due to the characteristics of sodium salt, it is allowed to use low-concentration electrolyte (with the same concentration electrolyte, the conductivity of sodium salt is about 20% higher than that of lithium electrolyte) to reduce costs; (3) sodium ions do ...

AI Technical Summary

Problems solved by technology

[0003] At present, the main problems of sodium-ion batteries are: the diffusion rate of positive active materials is low, the conductivity is poor, and the utilization rate of materials is low, which not only increases the preparation cost of sodium-ion batteries, but also has poor cycle stability of sodium-ion batteries.