Supercharge Your Innovation With Domain-Expert AI Agents!

Negative electrode active material for lithium secondary battery and method for preparing same

A negative electrode active material, lithium secondary battery technology, applied in the direction of secondary batteries, battery electrodes, negative electrodes, etc., can solve the problems of degradation of life characteristics, reduction of electrical connections, and reduction of initial efficiency, etc., to improve initial efficiency and life characteristics Effect

Active Publication Date: 2020-05-01
LG ENERGY SOLUTION LTD
View PDF16 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, Si particles cannot withstand the volume change upon repeated charge / discharge, and are cracked and broken in the crystal, the electrical connection between adjacent particles is reduced, and the final lifetime characteristics are deteriorated
[0008] Therefore, research has been conducted to use silicon oxide (SiO x ) to improve lifetime characteristics and reduce volume expansion, but since silicon oxide forms an irreversible phase when intercalating lithium, initial efficiency decreases and lifetime characteristics deteriorate as lithium is consumed

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Negative electrode active material for lithium secondary battery and method for preparing same
  • Negative electrode active material for lithium secondary battery and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Example 1: Fabrication of Negative Electrodes Comprising Doped Composite-Shaped Composite Particles

[0085] Step 1: Doping of SiO particles

[0086] 100g average particle size D 50 1.5μm SiO particles and 10g average particle size D 50 Magnesium powder of 5 μm was mixed and put into a chamber, and heat-treated at 950° C. for 2 hours in an Ar atmosphere to dope SiO particles with magnesium. In this case, the amount of magnesium doped in SiO was 8% by weight, and the average particle size of the resulting magnesium-doped SiO as measured using a laser diffraction particle size analyzer (Microtrac MT 3000) was 1.5 μm.

[0087] Step 2: Process for manufacturing composite particles

[0088] 100 parts by weight of SiO particles doped in Step 1, 10 parts by weight of pitch, and 5 parts by weight of CNTs were added to the chamber, and sintered at 850° C. for 3 hours under an Ar atmosphere, thereby yielding composite particles, In the composite particles, doped SiO particle...

Embodiment 2

[0092] Example 2: Fabrication of Negative Electrodes Comprising Doped Composite-Shaped Composite Particles

[0093] Step 1: Doping of SiO particles

[0094] 100g average particle size D 50 6μm SiO particles and 10g average particle size D 50 Magnesium powder of 5 μm was mixed and placed in a chamber, and heat-treated at 950° C. for 2 hours under an Ar atmosphere to dope SiO particles with magnesium. In this case, the amount of magnesium doped in SiO was 8% by weight, and the average particle diameter of the obtained magnesium-doped SiO was 6 μm as measured with a laser diffraction particle size analyzer (Microtrac MT3000).

[0095] Step 2: Process for manufacturing composite particles

[0096] 100 parts by weight of SiO particles doped in Step 1, 10 parts by weight of pitch, and 5 parts by weight of CNTs were added to the chamber, and sintered at 850° C. for 3 hours under an Ar atmosphere, thereby yielding composite particles, In the composite particles, doped SiO particle...

experiment example

[0126] Experimental Example: Performance Evaluation of Lithium Secondary Batteries

[0127] Secondary batteries including the negative electrodes manufactured in Examples 1 and 2 and Comparative Examples 1 to 5 were manufactured by a conventional method and then charged / discharged. In this case, charging was performed by applying a current at a current density at a rate of 0.1C up to a voltage of 4.2V, and discharging was performed at the same current density up to a voltage of 2.5V. This charge / discharge condition was applied to the first cycle, and the initial efficiency (%) was measured in the first cycle, and the capacity retention (%) was measured during 49 cycles under the 0.5C rate condition.

[0128] The initial efficiency (%) and capacity retention (%) were calculated as follows, and their values ​​are shown in Table 1 below.

[0129] Initial efficiency (%)=(discharge capacity in the first cycle / charge capacity in the first cycle)×100

[0130] Capacity retention (%)...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The present invention relates to a negative electrode active material for a lithium secondary battery, a method for preparing same, and a negative electrode and a lithium secondary battery comprisingsame, the negative electrode active material comprising: silicon oxide particles doped with a metal such as aluminum, lithium, magnesium or calcium; a linear conductive material positioned between thedoped silicon oxide particles; and composite particles having a carbon-based binder binding the doped silicon oxide particles and the conductive material together, wherein the carbon-based binder isa sintered result of a carbon-based precursor. A negative electrode active material according to the present invention has excellent initial efficiency and life characteristics.

Description

technical field [0001] This application claims the benefit of Korean Patent Application No. 10-2018-0059234 filed with the Korean Intellectual Property Office on May 24, 2018, the disclosure of which is incorporated herein by reference in its entirety. [0002] The present invention relates to a negative electrode active material for lithium secondary batteries and a preparation method thereof, more particularly, to a negative electrode active material for lithium secondary batteries with high initial efficiency and long life characteristics and a preparation method thereof. Background technique [0003] With the technological development and increasing demand of mobile devices, the demand for secondary batteries as energy sources has increased dramatically. Among secondary batteries, lithium secondary batteries are widely used in commercial applications due to their high energy density and voltage, long cycle life, and low discharge rate. [0004] The lithium secondary bat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/38H01M10/0525C01B33/113
CPCH01M4/485Y02P20/133H01M4/362H01M4/625C01B33/113H01M4/621H01M10/0525H01M2004/021H01M2004/027
Inventor 李秀民金帝映吴一根李龙珠
Owner LG ENERGY SOLUTION LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com