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Anode for lithium secondary battery and lithium secondary battery comprising same

A lithium secondary battery and negative electrode technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of low expansion and cycle capacity reduction, and achieve excellent high-temperature storage performance

Pending Publication Date: 2021-12-10
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, among silicon-based materials, SiO is good in that it has a long life due to low expansion, but it needs to be improved because of the problem of early cycle capacity reduction

Method used

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  • Anode for lithium secondary battery and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] By doping SiO with Mg x (02 SiO 4 and MgSiO 3 SiO in at least one silicate phase x (0<x<2) (Mg-containing silicon oxide composite material)" and spherical natural graphite are mixed in a weight ratio of 15:85 to be used as the negative electrode active material, and the negative electrode active material, CNT, Super C65 (dot-type conductive material), CMC and SBR are mixed in a weight ratio of 96:1:1:1:1 to prepare negative electrode slurry. Copper current collectors are coated with the negative electrode slurry, dried and rolled pressure to prepare the negative electrode.

Embodiment 2

[0080] By doping SiO with Mg x (02 SiO 4 and MgSiO 3 SiO in at least one silicate phase x (0<x<2) (Mg-containing silicon oxide composite material) and spherical natural graphite are mixed with a weight ratio of 15:85 to be used as the negative electrode active material, and the negative electrode active material, CNT, SFG6L (scale graphite-like conductive material), CMC and SBR were mixed in a weight ratio of 92:1:5:1:1 to prepare negative electrode slurry. A copper current collector was coated with the negative electrode slurry, dried and rolled to prepare a negative electrode.

Embodiment 3

[0082] In addition to using 0.75% by weight of CNT in Example 1 to mix the negative electrode active material, CNT, Super C65 (point-type conductive material), CMC and SBR in a weight ratio of 96.25:0.75:1:1:1, with A negative electrode was prepared in the same manner as in Example 1.

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Abstract

The present invention relates to a negative electrode for a lithium secondary battery and a lithium secondary battery including the negative electrode, wherein, since the negative electrode of the present invention includes a silicon oxide (SiOx, 0<x<2) composite containing magnesium (Mg) in a negative electrode active material and optimizes a type and an amount of a conductive agent, the lithium secondary battery including the negative electrode may improve a decrease in early-cycle capacity and high-temperature storage performance.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0159388 filed with the Korean Intellectual Property Office on December 11, 2018, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a negative electrode for a lithium secondary battery and a lithium secondary battery including the negative electrode, in particular, to a negative electrode for a lithium secondary battery and a lithium secondary battery including the negative electrode. The negative electrode for the secondary battery can be obtained by including silicon oxide (SiO2) containing magnesium (Mg) in the negative electrode active material. x , 0<x<2) composite materials and optimize the type and amount of conductive materials to improve early cycle capacity decline and high temperature storage performance. Background technique...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/133H01M4/62H01M4/36H01M4/48H01M4/587H01M10/052
CPCH01M4/587H01M4/62H01M4/133Y02E60/10H01M4/483H01M4/364H01M4/625H01M10/0525H01M4/13H01M10/052H01M4/362H01M4/466H01M2004/027
Inventor 申善英金帝映李龙珠
Owner LG ENERGY SOLUTION LTD