Negative electrode manufacturing device and negative electrode manufacturing method0

Abstract

The present invention relates to a negative electrode manufacturing device comprising: a pre-lithiation reaction tank which is partitioned into an impregnation section, a pre-lithiation section, and an aging section in this order, and includes a pre-lithiation solution; a negative electrode roll which is disposed outside the pre-lithiation solution and can wind and unwind a negative electrode structure; and one or more pre-lithiation rolls which are disposed in the pre-lithiation solution and can make the negative electrode structure unwound from the negative electrode roll travel into the pre-lithiation reaction tank. The pre-lithiation roll includes an inner ring, an outer ring which is formed on the inner ring and can rotate, and a rolling body disposed between the inner ring and the outer ring. The outer ring included in the pre-lithiation roll includes a nonconductor.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2019-0057950 filed on May 17, 2019, the disclosure of which is hereby incorporated by reference in its entirety. [0003] The present invention relates to a device for producing negative electrodes and a method for producing negative electrodes. Background technique [0004] Recently, in order to cope with the rapid spread of battery-using electronic devices such as mobile phones, notebook computers, and electric vehicles, the demand for secondary batteries that are small in size, light in weight, and relatively high in capacity is rapidly increasing. In particular, lithium secondary batteries have been in the spotlight as driving power sources for portable devices due to their light weight and high energy density. Therefore, research and development work to improve the performance of lithium secondary batteries has ...

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Problems solved by technology

However, since these materials are conductive materials, when a roll structure including this material is applied in the pre-lithiation process, the current for intercalating lithium into the negative electrode structure at least partially flows outward, whereby the current is absorbed by the conductive material. Consumption, therefore, there is a problem that process loss occurs and it is difficult to stably perform pre-lithiation and control the degree of pre-lithiation of the negative electrode structure

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