A kind of manufacturing method of lithium ion battery containing gel electrolyte

Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for manufacturing a lithium-ion battery containing a gel electrolyte, the method comprising: preparation of a microporous isolation membrane, preparation of a battery cell, filling of the electrolyte and post-treatment and other steps. Compared with the prior art, the present invention adopts a two-step method to polymerize the gel. Through the pre-gelation step, the cell forms a good cathode electrode / electrolyte interface and an anode electrode / electrolyte interface. During the formation process, the cathode is activated The material and the anode active material are fully activated, and the battery is heated while pressurized after formation, which can eliminate the bubbles generated during the formation process of the battery and exist between the cathode electrode / electrolyte interface and the anode electrode / electrolyte interface. Making the interface gap smaller is more conducive to the formation of a good cathode electrode sheet / electrolyte interface and anode electrode sheet / electrolyte interface, so that the battery has more excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a method for manufacturing a lithium ion battery containing gel electrolyte. Background technique [0002] Lithium-ion batteries are currently the most advanced commercial secondary batteries in the world. With the development of various electronic products, the demand for lithium-ion batteries in these electronic products is showing a trend of rapid growth. The high discharge voltage, high energy density and excellent low self-discharge characteristics of lithium-ion batteries have made them widely used. [0003] With the development of electronic technology, electronic products have become smaller and lighter, which also puts forward higher requirements for secondary power sources: higher energy density, higher power density and better safety performance, and also requires The secondary power supply can be made into different shapes according to the electronic pr...

AI Technical Summary

Problems solved by technology

[0005] However, batteries using gel electrolytes also have their disadvantages: the electrolyte cannot fully wet the active material of the pole piece, and the conductivity of its own lithium ions is worse than that of the liquid electrolyte, so that lithium ions cannot fully flow between the cathode and the anode. Free migration, so that the capacity of the battery will decrease, and the performance of high-current charging and discharging and low-temperature charging and discharging will also be deteriorated, which cannot meet the application requirements

Although the gel electrolytes prepared by these methods have higher ionic conductivity, they are all worse than liquid electrolytes, and the performance of lithium-ion batteries using corresponding gel electrolytes still cannot reach the design goals very well, and cannot fully meet the requirements. Application requirements

And there may be a problem: there are uneven small pieces of glue between the battery cell and the packaging material, or there are small pieces of glue on the side of the battery cell, these glue pieces will affect the appearance of the battery, and may affect the quality of the battery. encapsulation

[0008] In addition, the Chinese patent application with the application number CN01111388.X and the name of the manufacturing method of the gel electrolyte battery proposes a manufacturing method of the gel electrolyte battery. The performance of the battery can almost meet the application requirements, but the preparation The method is very high on equipment and environment

Images