Manufacturing method of high-energy-density aluminum shell lithium ion battery

Abstract

The invention provides a manufacturing method of a high-energy-density aluminum shell lithium ion battery, which comprises the following steps: S1, preparing a positive plate and a negative plate, assembling an aluminum shell battery, keeping insulation between the aluminum shell and the positive plate and the negative plate of the battery, and then injecting a pre-lithiation electrolyte into the aluminum shell battery; S2, connecting the aluminum shell with the positive electrode of an external power supply, connecting the negative plate with the negative electrode of the external power supply, and charging with small current for pre-lithiation; and S3, removing the pre-lithiated electrolyte, injecting a functional electrolyte, and then performing activation and sealing to obtain the high-energy-density aluminum shell lithium ion battery. According to the method, in-situ lithium pre-embedding of the negative electrode of the lithium ion battery can be accurately controlled, so that lithium consumption in the processes of negative electrode film forming and the like in the first-time charging process is compensated, gram volume exertion of the positive electrode material in the actual lithium ion battery is improved, and due to the fact that additional auxiliary electrodes or electrode materials do not need to be added in the lithium pre-embedding process, andoperation is simple and convenient. And the capacity and the energy density of the lithium ion battery can be improved.

Description

technical field [0001] The invention relates to the technical field of high energy density lithium batteries, in particular to a method for manufacturing a high energy density aluminum shell lithium ion battery. Background technique [0002] Lithium-ion batteries stand out among secondary batteries due to their excellent charge and discharge performance, and are widely used in consumer electronics, electric transportation, energy storage and other fields. High energy density is an important development direction of lithium-ion batteries. [0003] The development and application of new materials is an important way to improve the energy density of lithium-ion batteries. In recent years, people have developed a series of high-voltage, high-capacity positive electrode materials, and high-capacity negative electrode materials. Among them, the silicon-based negative electrode materials (silicon oxide / carbon composite negative electrode materials, nano-silicon / carbon composite n...

AI Technical Summary

Problems solved by technology

[0004] In order to compensate for the loss of lithium during the first charge and discharge process, researchers often add lithium supplements to the positive and negative materials of the battery or on the surface of the electrodes to achieve lithium supplementation or pre-lithiation. However, negative lithium supplements (such as lithium foil , stabilized lithium powder) usually have high reactivity with moisture in the air, even with oxygen and carbon dioxide, high requirements for environmental control, and great safety hazards; positive electrode lithium supplementation usually leaves inactive substances after delithiation, thereby reducing the cost of positive electrode materials. overall specific capacity