Gel lithium ion battery with high and low temperature balance and fabrication method thereof

Abstract

The invention relates to the technical field of manufacturing of a lithium ion battery, and particularly relates to a gel lithium ion battery with high and low temperature balance. The gel lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and electrolyte, wherein the positive electrode contains a positive active material; the negative electrode contains a negative active material; the diaphragm is arranged between the anode positive electrode and the negative electrode; the diaphragm is a gel diaphragm of which two sides are coated by kynar-hexafluoropropylene; the electrolyte comprises electrolyte and a solvent; the electrolyte is a lithium salt; the concentration is 1.0-1.2 mol / L; the solvent comprises 15-20% of ethylene carbonate, 50-60% of ethyl methyl carbonate, 8-15% of propylene carbonate and 8-15% of diethyl carbonate by mass fraction. The gel lithium ion battery is simple in formula, and matched with the electrolyte with high and low temperature resistance by gelatinization of the diaphragm of the lithium ion battery, so as to improve the characteristics of the high and low temperature resistance of the battery.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a gel lithium-ion battery with both high and low temperature and a manufacturing method thereof. Background technique [0002] Lithium-ion batteries have beneficial properties such as high working voltage, high energy density, long cycle life, small self-discharge rate, low pollution, and no memory effect. , portable computers, cameras, etc. have been widely used. Now countries around the world are also investing a lot of resources to actively study the application of lithium-ion batteries in electric vehicles and hybrid vehicles, especially gel lithium-ion batteries. Gel lithium-ion batteries have shown a strong momentum of development, and their use is not limited to In portable electronic products, electric vehicles and other fields, it has also been extended to artificial satellites, aerospace and other fields. [0003] The existing gel lithium-i...

AI Technical Summary

Problems solved by technology

However, in order to achieve good electrical conductivity and long cycle life in current gel lithium-ion batteries, the formulation of gel lithium-ion batteries developed by research and development is complicated. For example, some lithium-ion batteries use imidazole and pyrrole ionic liquid-gel Gel polymer electrolyte, and its high cost, is difficult to be widely used; on the other hand, it is difficult for the current gel lithium-ion battery to achieve high-temperature and low-temperature performance at the same time

Images