Preparation process of gel lithium battery

Abstract

The invention is applicable to the technical field of lithium battery preparation, and provides a preparation process of a gel lithium battery, which comprises the following steps: forming slurry coatings on the surfaces of a positive pole piece and a negative pole piece in a manner of dip-coating the positive pole piece and the negative pole piece in a mixed solution containing a gel material, nano ceramic powder, a dispersing agent, a solvent and a flame-retardant additive; and enabling the coating to be subjected to vacuum baking to form a gel film to replace a lithium battery diaphragm inthe prior art, so that the energy density of the battery can be improved. After the composite positive pole piece and the composite negative pole piece are wound into a battery cell and electrolyte isinjected into the battery cell, multidimensional pores are formed, channels of lithium ions in a gel thin film are guaranteed, the electrolyte containing the flame-retardant additive is prepared, andthe safety performance of the battery can be improved by means of self-dissolution and extraction of the flame-retardant additive in the electrolyte. The gel films on the surfaces of the composite positive pole piece and the composite negative pole piece are formed into self-crosslinking at high temperature and high pressure to form a good reaction interface, so that the ionic conductivity of lithium ions in the gel films is ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a preparation process of a gel lithium battery. Background technique [0002] At present, solid-state batteries in the lithium battery industry are divided into all-solid-state polymer batteries and semi-solid-state polymer batteries. The research on solid-state polymer electrolytes is the core technology for realizing plasticized thin-film lithium-ion batteries. [0003] All-solid-state polymer batteries generally use lithium salts, solvents, and doped, modified or copolymerized resin plastics to prepare solid-state electrolyte separators by extraction or phase inversion methods, and then place them between lithium battery electrodes as gel-state electrolytes. Thin films are then produced through conventional battery procedures. Gel electrolyte separators can also be formed by adding plasticizers or fillers. All-solid polymer electrolytes are us...

AI Technical Summary

Problems solved by technology

The most prominent problems of polymer electrolytes are: most of the system is in a crystalline state at room temperature, and the conductivity is very low, which cannot meet the actual needs; it has poor compatibility with metal lithium electrodes, and it is easy to form a passivation film at the electrode / electrolyte interface. In the process of lithium deposition and dissolution, the current distribution is uneven, dendrites are formed, the capacitance of the electrode is reduced, and the cycle performance and electrical performance of the battery are affected; the preparation process is very complicated, and the solvents used are generally high-toxic and high-risk solvents, which cause environmental pollution. big, expensive

This method can increase the mechanical strength of the battery, and has a certain inhibitory effect on the expansion of the battery due to the internal adhesion effect, but the disadvantage is obvious: it cannot further meet the current growing lithium batteries, especially power batteries and consumer batteries. Density development requirements; it is still a conventional liquid free electrolyte, and the safety performance is still not guaranteed

Images