Preparation method of lithium thionyl chloride carbon electrode pellet material

Abstract

The invention discloses a preparation method of a lithium thionyl chloride carbon electrode pellet material, characterized by comprising the following steps: performing powder mixing on acetylene black, a liquid cathode catalyst and water with the proper mass of 1/2-3/4 to obtain a semi-dry material, stirring a PTFE emulsion adhesive, an ionic accelerator and the remaining water at a high speed of1000-2000r/min for 60-90 seconds to form a mixed liquid, adding the mixed liquid into the semi-dry material, and continuously performing powder mixing to form a wet material; and performing strip extruding and shot blasting on the wet material, drying, and then performing fiber adding and shaping to obtain finished pellets with the apparent density of 0.12-0.2g/mL. According to the scheme of theinvention, flammable and explosive organic solvents are not used, and thus the safety risk and production cost can be reduced; through the optimization of manufacturing processes and parameters, the damages to the surface of the pellets caused by scattering can be eliminated, a sieving process is not required, and thus the generation of fine particles and dust in the manufacturing process can be reduced, and the safety of electrodes can be improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing a lithium thionyl chloride carbon electrode pellet material. Background technique [0002] The lithium thionyl chloride battery uses metal lithium as the negative electrode, liquid thionyl chloride as the positive electrode active material and electrolyte solvent, and a liquid cathode structure chemical power source with porous carbon as the catalytic electrode. The overall reaction mechanism is: 4Li+2SOCl 2 →4LiCl+S+SO 2 , due to the generation of insoluble solid products LiCl and S, as the discharge progresses, the surface and inner pores of porous carbon are gradually covered and blocked by insoluble solid products, which gradually passivates and deactivates the carbon positive electrode, resulting in the termination of battery life. [0003] The carbon electrode itself does not participate in the electrochemical reaction, but only plays the role of ...

AI Technical Summary

Problems solved by technology

[0005] (2) Organic solvents will cause the pellets to easily stick to each other after drying and fibrillating, which is not conducive to sieving. If the sieving time is long or the process of scattering is increased, the surface of the pellets will be damaged and the apparent area will decrease, resulting in discharge performance. Uneven, fine particles and dust will be produced when the pellets are scattered and separated, and the finished product rate after sieving is only 70-80%;

[0006] (3) The strength of the pellets is low and the elasticity is not enough. Due to the high wettability of the organic solvent, the pellets thrown out are porous and soft, the surface is rough, and they are easy to deform or form small groups during shot blasting. Soft pellets and pellets when pressing rods The contact resistance between them is large, and a high impedance will be generated when the battery is discharged with a large current. The surface of the accelerating rod body is quickly blocked by the reaction product, and the inner hole is not fully utilized, thereby reducing the utilization rate of the carbon electrode.

Images