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Pre-lithiated negative electrode and secondary battery comprising same

A secondary battery, pre-lithiation technology, applied in the direction of secondary batteries, lithium batteries, negative electrodes, etc., can solve the problems of lithium ion consumption, battery capacity reduction, cycle life decline, etc., to achieve improved cycle characteristics, high capacity and High energy characteristics, effects of improving high-temperature storage stability

Pending Publication Date: 2022-04-12
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, since the formation of such a coating film is an irreversible reaction, lithium ions are consumed, resulting in an undesired decrease in battery capacity
In addition, since the charging / discharging efficiency of carbon electrodes and positive electrodes is not completely 100%, lithium ions are consumed as the number of cycles increases, resulting in problems of decreased electrode capacity and cycle life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134]

[0135] First, needle coke was heat-treated and graphitized at 1,500°C for 12 hours to obtain primary particles. Next, the primary particles were mixed with a pitch binder and heat-treated at a temperature of 2,900° C. for 12 hours to increase the crystallinity of the active material and form secondary particles, thereby providing artificial graphite.

[0136] The obtained artificial graphite was not coated with carbon, and was a high-capacity artificial graphite with a capacity of 360 mAh / g and an average particle diameter of 18 μm.

[0137] Then, the artificial graphite, Super C65 as a conductive material, styrene-butadiene rubber (SBR) as a binder, and carboxymethyl cellulose (CMC) as a thickener were prepared in a weight ratio of 96:1:2:1. After mixing, water was added to the resulting mixture to obtain negative electrode slurry.

[0138] Negative electrode slurry at 3.6mAh / cm 2 The loading amount of is coated on one surface of the copper foil (current collecto...

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PUM

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Abstract

Disclosed is a pre-lithiated negative electrode comprising: a negative electrode current collector; and a negative electrode active material layer formed on at least one surface of the negative electrode current collector, in which the negative electrode active material layer includes a high capacity artificial graphite without a carbon coating, the negative electrode active material layer is pre-lithiated, and the lithium content of the pre-lithiated negative electrode is less than the lithium content of the pre-lithiated negative electrode when the pre-lithiated negative electrode is charged to 100%. The content of lithium embedded in the pre-lithiated negative electrode active material layer is 3% to 5%.

Description

technical field [0001] The present disclosure relates to a pre-lithiated negative electrode and a secondary battery including the pre-lithiated negative electrode. In particular, the present disclosure relates to a pre-lithiated negative electrode having high capacity and energy density and showing improved cycle characteristics, and a secondary battery including the pre-lithiated negative electrode. [0002] This application claims priority from Korean Patent Application No. 10-2019-0144564 filed in Korea on November 12, 2019, the disclosure of which is incorporated herein by reference. Background technique [0003] Recently, energy storage technology has received more and more attention. As the application of energy storage technology expands to the energy source of mobile phones, video cameras and laptop computers, and even the energy source of electric vehicles, the research and development work of electrochemical devices has been increasingly put into practice. In thi...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/134H01M4/36H01M4/38H01M4/583H01M10/052
CPCH01M10/0525H01M4/525H01M4/1393H01M4/587H01M4/133H01M4/0459H01M2004/027H01M50/105Y02E60/10H01M4/362H01M4/0445H01M2004/021
Inventor 崔希原金睿利朴燦基曺美如蔡午秉黄丞彗
Owner LG ENERGY SOLUTION LTD
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