A kind of preparation method of high energy density lithium-ion battery

Abstract

The invention discloses a method for preparing a high energy density lithium ion battery. It includes the following steps: A. Use low glass temperature acrylic modified chitosan derivative glue to make the negative electrode sheet; B. Use a wet separator and pre-coat acrylic glue, C. At a temperature of 70-90°C and a pressure of 0.2 Under the environment of -0.5MPa, pressurize the battery for 20-60 minutes to make the battery; D. Inject the battery with liquid. After the battery is filled with liquid, it is aged at a temperature of 45-55℃ and aged for 70-75 hours. The time allows the electrolyte and acrylic glue to fully combine. After adopting the above method, various parameters are reasonably controlled during the process of making the battery to ensure uniform pressure on the upper, lower, left and right sides of the battery. After pressing, the battery has a hardness similar to that of a solid electrolyte lithium-ion battery, thus greatly improving the high-temperature storage performance and high-temperature cycle performance of the battery. , Low-temperature charging performance, the energy density of its lithium iron battery is increased to about 170wh / kg, without the defects of high internal resistance and poor rate of general solid electrolytes.

Description

Technical field [0001] The invention relates to a method for preparing a high-energy-density lithium-ion battery and belongs to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes. With the development of lithium-ion battery technology, its applications are becoming more and more widespread. However, existing lithium-ion batteries Because its preparation method is not reasonable, it usually has the following defects. On the one hand, the high-temperature storage performance and high-temperature cycle performance of the battery are relatively low. On the other hand, the low-temperature charging performance is also very low. On the other hand, there is also the high internal content of the solid electrolyte. Due to the defects of poor resistance and rate, the battery energy density is very low. Contents of the inve...

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion battery is a kind of secondary battery. It mainly relies on lithium ions to move between the positive and negative electrodes. With the development of lithium-ion battery technology, its application is becoming more and more extensive. However, the existing lithium-ion batteries Due to its unreasonable preparation method, there are usually the following defects. On the one hand, the high-temperature storage performance and high-temperature cycle performance of the battery are relatively low; on the other hand, the low-temperature charging performance is also very low; The defects of poor resistance and rate, the battery energy density is very low