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...

Examples

Embodiment 1

[0065] Prepare a positive electrode active material in which a three-component system consisting of Ni, Co, and Mn, or a spinel structure such as LiM is coated on an aluminum foil serving as a positive electrode current collector. 2 o 4 (M=Mn, Ni 0.5 mn 1.5 , CoMn), or olivine-structured cathode active materials such as LiMPO 4 (M=Fe, Mn, Co) positive electrode, and prepare a negative electrode in which a Si-based negative electrode active material is coated on a copper foil as a negative electrode current collector, and pass to provide a porous film as a separator between the positive electrode and the negative electrode At least one unit cell was prepared by roll forming the positive electrode and the negative electrode by means of a polyethylene film. The prepared unit cells were arranged in a reaction tank, and electrodes of the same polarity were connected by cables.

[0066] LiPF containing 1M as lithium salt 6 And an electrolyte solution of a mixture of ethylene ca...

Embodiment 2

[0069] A lithium secondary battery was manufactured by the same method as in the above-described examples, except that the positive electrode and the negative electrode included leads connected thereto through tabs, and predoping was performed by connecting the respective leads.

[0070] In this way, in the case of a stacked cell structure, a parallel predoping of the stacked cells is achieved instead of a predoping of the individual electrodes.

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...

Examples

Embodiment 1

[0065] Prepare a positive electrode active material in which a three-component system consisting of Ni, Co, and Mn, or a spinel structure such as LiM is coated on an aluminum foil serving as a positive electrode current collector. 2 o 4 (M=Mn, Ni 0.5 mn 1.5 , CoMn), or olivine-structured cathode active materials such as LiMPO 4 (M=Fe, Mn, Co) positive electrode, and prepare a negative electrode in which a Si-based negative electrode active material is coated on a copper foil as a negative electrode current collector, and pass to provide a porous film as a separator between the positive electrode and the negative electrode At least one unit cell was prepared by roll forming the positive electrode and the negative electrode by means of a polyethylene film. The prepared unit cells were arranged in a reaction tank, and electrodes of the same polarity were connected by cables.

[0066] LiPF containing 1M as lithium salt 6 And an electrolyte solution of a mixture of ethylene ca...

Embodiment 2

[0069] A lithium secondary battery was manufactured by the same method as in the above-described examples, except that the positive electrode and the negative electrode included leads connected thereto through tabs, and predoping was performed by connecting the respective leads.

[0070] In this way, in the case of a stacked cell structure, a parallel predoping of the stacked cells is achieved instead of a predoping of the individual electrodes.

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