A kind of preparation method of ultra-low temperature high rate lithium-ion battery

Abstract

The invention relates to a preparation method of an ultra-low temperature and high rate lithium ion battery. The preparation method of the ultra-low temperature high-rate lithium-ion battery of the present invention, the steps are as follows: A) using NMP as a solvent, uniformly mixing lithium cobaltate, conductive agent, PVDF or PVDF / HFP to prepare a positive electrode slurry; B) mist Spray the positive electrode slurry evenly on the positive electrode current collector with a chemical spray gun, and form the positive electrode sheet after drying, rolling, and cutting; C) Using NMP as the solvent, the negative electrode material, conductive agent, PVDF or PVDF / HFP is uniformly mixed and configured as negative electrode slurry; D) Spray the negative electrode slurry evenly on the negative electrode current collector with an atomizing spray gun, and form negative electrode sheets after drying, rolling, and cutting; E) Prepared The positive and negative pole pieces and the polyolefin separator are laminated or wound to form a cell, the cell is packaged with aluminum-plastic film, vacuum-dried, injected with electrolyte, and formed after standing to obtain a lithium-ion battery. Compared with the prior art, the present invention has the following advantages: the migration distance of lithium ions can be reduced, and the charging and discharging performance can be improved; the solvent can be easily removed, the energy consumption of equipment is less, and the technological process is environmentally friendly.

Description

technical field [0001] The invention relates to a preparation method of an ultra-low temperature and high rate lithium ion battery. It is especially suitable for a preparation method of a lithium-ion battery that can be discharged at a rate of 5C at a temperature of -40°C. Background technique [0002] Lithium-ion batteries have the characteristics of high nominal voltage, high specific energy, long cycle life, no memory effect, etc., and are environmentally friendly and pollution-free. Therefore, they are widely used in digital products such as mobile phones, notebook computers, and MP3s. At the same time, they are used in electric vehicles , Electric bicycles, national defense equipment and other batteries have also begun to be applied. [0003] In recent years, lithium-ion power batteries have been used more and more widely in various fields. The environment in which batteries are used is complex, and the performance requirements for batteries are higher. Even at lower ...

AI Technical Summary

Problems solved by technology

[0004] The low-temperature battery made by traditional technology can be discharged at a small rate at low temperature, but when it is discharged at a high rate, the battery voltage drops rapidly to the cut-off voltage, and it cannot be discharged at low temperature, which limits the use of lithium-ion batteries in areas with harsh external environments. Applications