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Anode for lithium secondary battery and method for manufacturing lithium secondary battery

A lithium secondary battery and negative electrode technology, which is applied in the field of manufacturing negative electrodes for lithium secondary batteries and manufacturing lithium secondary batteries, and can solve problems such as small capacity

Active Publication Date: 2021-02-02
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of carbon-based materials, there is a disadvantage of small capacity since the theoretical capacity is only about 400mAh / g

Method used

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  • Anode for lithium secondary battery and method for manufacturing lithium secondary battery
  • Anode for lithium secondary battery and method for manufacturing lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Manufacture of negative electrode components

[0097] By adding 92% by weight of negative active material (graphite: SiO=7:3), 3% by weight of conductive agent (Denkablack), 3.5% by weight of binder (SBR) and 1.5% by weight of thickener (CMC) Added to water to prepare negative electrode active material slurry.

[0098] One surface of a copper current collector was coated with the anode active material slurry prepared above, dried and rolled to manufacture an anode assembly.

[0099] Pre-lithiation of negative electrode components

[0100] A first pre-lithiation solution was prepared by adding 1% by weight of fluoroethylene carbonate (FEC) as a first additive to ethylene carbonate (EC) and ethylmethyl carbonate (EMC) in 3: In the mixed solvent (the first organic solvent) with a volume ratio of 7, LiPF will be used as the first lithium salt 6 Dissolve in the solvent so that the concentration is 1M.

[0101] A second pre-lithiation solution was prepared by adding 1...

Embodiment 2

[0110] The negative electrode and the coin-type full battery were manufactured by performing the same procedure as in Example 1, except that in the second pre-lithiation solution of the pre-lithiation step, the content of FEC as an additive for the electrolyte solution was 5 weight%.

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Abstract

The present invention provides a method for manufacturing an anode for a lithium secondary battery, the method comprising the steps of: manufacturing an anode assembly by forming an anode active material layer on an anode current collector; and pre-lithiating the anode assembly, wherein: the pre-lithiating step comprises a first pre-lithiation step of performing pre-lithiation by impregnating theanode assembly with a first pre-lithiation solution, and a second pre-lithiation step of performing pre-lithiation by impregnating the anode assembly with a second pre-lithiation solution after the first pre-lithiation step; the first pre-lithiation solution comprises an ionizable first lithium salt, a first organic solvent, and a first additive; the second pre-lithiation solution comprises an ionizable second lithium salt, a second organic solvent, and a second additive; and a weight ratio of the first additive in the first pre-lithiation solution is smaller than that of the second additive in the second pre-lithiation solution.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2018-0108961 filed on September 12, 2018, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a method of manufacturing a negative electrode for a lithium secondary battery and a method of manufacturing a lithium secondary battery, and more particularly, to a method of manufacturing a negative electrode for a lithium secondary battery and a lithium secondary battery, Wherein in the fabrication process of the negative electrode, it is performed by dividing the pre-lithiation step into two steps, and the amount of additives used in the pre-lithiation solution is reduced in the first pre-lithiation step and added in the second pre-lithiation step, so that a solid electrolyte interface (Solid Electrolyte Interface, SEI) film can be formed mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M4/36H01M4/38H01M4/587H01M10/058H01M10/052
CPCH01M4/587Y02E60/10Y02P70/50H01M4/0404H01M4/0416H01M4/1393H01M4/1395H01M4/0445H01M10/0567H01M4/364H01M4/386H01M2004/027H01M4/139H01M4/0459H01M10/058H01M10/052H01M4/133H01M4/134H01M10/0525H01M2004/028
Inventor 蔡午秉禹相昱金睿利
Owner LG ENERGY SOLUTION LTD
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