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Negative electrode active material, method for preparing same, and negative electrode and secondary battery comprising same

A technology of negative electrode active material and negative electrode material, applied in secondary batteries, active material electrodes, negative electrodes, etc., can solve the problems of reduced life characteristics, limitations, deterioration of high temperature storage characteristics, etc., and achieve the effect of stable electrical contact

Pending Publication Date: 2022-04-29
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon-based active materials have problems in that the lifespan characteristics are reduced because the conduction path is blocked due to volume expansion / contraction with charge and discharge, and the high-temperature storage characteristics are deteriorated due to side reactions with the electrolyte during high-temperature storage
However, there are limitations in addressing the above-mentioned problems

Method used

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  • Negative electrode active material, method for preparing same, and negative electrode and secondary battery comprising same

Examples

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Effect test

preparation example Construction

[0065]

[0066] In addition, the present invention provides a method for preparing the above-mentioned negative electrode active material.

[0067] Specifically, the method for preparing the negative electrode active material of the present invention includes mixing silicon-based core particles and graphene sheets, and heat-treating the mixture.

[0068] The method for preparing the negative electrode active material of the present invention includes mixing silicon-based core particles and graphene sheets.

[0069] The silicon-based core particles have been described above.

[0070] The graphene sheets can be mixed with the silicon-based core particles and then heat treated to become a component of the outer carbon coating.

[0071] Specifically, the graphene sheet can be prepared by a method comprising the following steps.

[0072] (a) forming a dispersion comprising a graphitic material and a dispersant; and

[0073] (b) Make the dispersion liquid pass through the high-...

Embodiment 1

[0146] Embodiment 1: Preparation of negative electrode active material

[0147]

[0148] Plate graphite as a graphite-based material and polyacrylic acid as a dispersant were dispersed in water at a weight ratio of 95:5 to prepare a dispersion (solid content: 5% by weight).

[0149] Under an applied pressure of 1000 bar, 1 L of said dispersion liquid was introduced into the inlet of a high-pressure homogenizer, wherein said high-pressure homogenizer comprised said inlet, an outlet, and a micro flow path (diameter: 100 μm) connecting the inlet and the outlet, The dispersion was passed through the micro-channel at a speed of 100 m / s and circulated for 30 minutes. Through the above, the plate graphite was exfoliated to prepare graphene sheets.

[0150]The D / G ratio of the above-prepared graphene sheet was calculated by the Raman spectrum of a Raman spectrometer (trade name: Microscope Raman, manufacturer: Almega XR) (D / G ratio=0.2).

[0151]

[0152] As silicon-based core p...

Embodiment 2

[0156] Embodiment 2: Preparation of negative electrode active material

[0157] The negative electrode active material of Example 2 was prepared in the same manner as in Example 1, except that silicon-based core particles with an inner carbon coating and graphene sheets were mixed in a weight ratio of 90:10. In this negative electrode active material, the outer carbon coating was contained in the negative electrode active material in an amount of 10% by weight. In addition, the D / G ratio of the graphene sheet used in Example 2 and the graphene contained in the outer carbon coating was 0.2.

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Abstract

The present invention relates to a negative electrode active material comprising: a silicon-based core particle; and an outer carbon coating layer formed on the silicon-based core particle, wherein the outer carbon coating layer contains graphene having a D / G ratio in a Raman spectrum of 0.35 or less.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2019-0138874 filed with the Korean Intellectual Property Office on November 1, 2019, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The invention relates to a negative electrode active material and a preparation method thereof, as well as a negative electrode containing the negative electrode active material and a lithium secondary battery. Background technique [0004] Recently, due to the rapid spread of electronic devices using batteries, such as mobile phones, notebook computers, electric vehicles, etc., the demand for small and lightweight secondary batteries with relatively high capacity has rapidly increased. In particular, lithium secondary batteries are lightweight and have high energy density, and thus are attracting attention as driving power sources for portabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/587H01M4/62H01M4/131H01M10/052C01B32/19
CPCH01M4/366H01M4/386H01M4/583H01M4/62H01M4/131H01M4/483H01M4/48H01M4/364H01M4/587H01M4/625H01M10/052C01B32/19H01M2004/027C01P2002/82H01M4/133H01M4/134H01M10/0525C01B32/05H01M4/0471
Inventor 金东赫全广训权元钟李龙珠
Owner LG ENERGY SOLUTION LTD
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