Method for prelithiation, method for fabricating lithium secondary battery comprising the method, and lithium secondary battery fabricated from the fabricating method

Abstract

The present disclosure relates to a method for prelithiation, and in particular, to a method for prelithiation that predopes lithium into at least one unit cell uniformly in large amounts. According to an aspect of the present disclosure, there is provided a method for prelithiation including an preparing at least one unit cell, the unit cell comprising a cathode, an anode, and a separator interposed between the cathode and the anode, disposing the prepared at least one unit cell in a reaction tank, and connecting electrodes having the same polarity, adding an electrolyte solution into the reaction tank, disposing a lithium metal plate in the electrolyte solution, and connecting the lithium metal plate to the anode, and doping the anode.

Description

technical field [0001] The present invention relates to a method for pre-doping lithium, and more particularly, to a method for pre-lithiation of a large amount of uniform pre-doped lithium into at least one unit cell, including the method of manufacturing lithium secondary A battery method, and a lithium secondary battery manufactured by the manufacturing method. [0002] This application claims priority to Korean Patent Application No. 10-2013-0025688 filed in Korea on March 11, 2013, the entire contents of which are incorporated herein by reference. [0003] In addition, this application claims priority to Korean Patent Application No. 10-2014-0028192 filed in Korea on Mar. 11, 2014, the entire contents of which are incorporated herein by reference. Background technique [0004] Recently, attention has been increasing in energy storage technologies. As the application field of energy storage technology has been extended to mobile phones, camcorders, notebook computers a...

AI Technical Summary

Problems solved by technology

However, metal-based (non-carbon-based) negative electrode active materials undergo cracking and pulverization due to the large volume change involved in lithium charge-discharge. As a result, secondary batteries using metal-based negative electrode active materials have the following disadvantages: Dramatic drop in capacity and short cycle life

[0009] However, when a perforated current collector is used, there are problems in that the loading amount of the electrode active material decreases, and thus the capacity decreases, and the contact area of ​​the electrode active material with the current collector decreases, so that the resistance to current increases.

In addition, in the case of specific high-capacity positive electrode active materials, a problem of crystal structure collapse based on the voltage range occurs, and it is known that the resulting metal ions degrade the solid electrolyte interface (SEI) layer generated on the surface of the negative electrode

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