Gel synergizing type polymer lithium ion battery and preparation method thereof

Abstract

This invention discloses a gelatin synergy polymer lithium iron battery and its making method, which includes: cell core composed of positive plate and negative plate, polymer gelatin on the diaphragm surface of the battery core's anode and cathode, and the polymer gelatin is composed of polymethacrylates, polyacrylonitrile, or copolymer composed of polyvinylidene fluoride and hexafluoropropene, wherein hexafluoropropene molecular weight takes up 10-20% of the copolymer's. Making battery includes the following steps: covering the polymer driving solution on the two ends of the battery core, drying, then injecting electrolyte to make the polymer driving immerse into the electrolyte completely, electrochemically activing the core to form the gelatin, finally obtaining gelatin synergy polymer lithium iron battery. This invention discloses the problem that the discharging rate increases, the voltage lowers and the capacity declines from the battery core 's internal short-circuit.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof, and in particular discloses a gel synergistic polymer lithium ion battery and a preparation method thereof. Background technique [0002] At present, in the industrial production of polymer lithium-ion batteries at home and abroad, there are two main assembly processes for battery cores: lamination and winding. The winding process is suitable for making small battery cores such as batteries for mp3 or bluetooth devices. Cell phones, PDAs, mobile DVDs, and other portable electronic devices require larger batteries that are suitable for the lamination process. [0003] During the cycle of the battery core, a small number of active substances will fall off from the pole pieces. If these active substances seep out from both ends of the battery core, it will cause a micro-short circuit inside the battery core, resulting in increased self-discharg...

AI Technical Summary

Problems solved by technology

[0003] During the cycle of the battery core, a small number of active substances will fall off from the pole pieces. If these active substances seep out from both ends of the battery core, it will cause a micro-short circuit inside the battery core, resulting in increased self-discharge rate, low voltage, and low capacity. Adverse consequences such as attenuation

In addition, in the stacking process, as the thickness of the pole piece increases, a small number of pole pieces will be pulled out during the welding process of the tabs. Since the diaphragm at both ends of the battery core is not closed, the pole piece will exceed the diaphragm and cause an internal short circuit.

Therefore, there are many limitations in the design of thick battery cores