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Negative electrode for lithium secondary battery and lithium secondary battery including the negative electrode

A negative electrode and negative electrode active material technology, applied in the direction of secondary batteries, battery electrodes, negative electrodes, etc., can solve the problems of low conductivity of silicon-based negative electrodes, achieve high conductivity, reduce irreversible capacity, and high energy density.

Active Publication Date: 2022-06-07
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of such batteries where high-speed charging is required, the use of silicon-based negative electrodes is not preferred due to their low conductivity

Method used

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  • Negative electrode for lithium secondary battery and lithium secondary battery including the negative electrode
  • Negative electrode for lithium secondary battery and lithium secondary battery including the negative electrode
  • Negative electrode for lithium secondary battery and lithium secondary battery including the negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The silicon oxide-based composite core forming the first negative electrode active material was prepared as follows. Powdered Si and SiO 2 Mixed in a 1:1 ratio (molar ratio) and heat-treated under a reduced pressure of 1 Torr to evaporate the mixture to SiO x (0x (02 The evaporation temperature of Mg is 1400 °C, and the evaporation temperature of Mg is 900 °C. The deposited product is Mg-SiO x (xx crushed to diameter (D 50 ) is about 5 μm.

[0088] To form a carbon coating covering the core of the silica-based composite, the Mg-SiO x The chamber was introduced and supplied with methane gas under an argon atmosphere to form a carbon coating by chemical vapor deposition (CVD) at 950°C. The thickness of the carbon coating was determined to be 40 nm as determined by transmission electron microscopy (TEM) analysis. In this way, the first anode active material was obtained. The silicon oxide-based composite includes: i) Si; ii) composed of the chemical formula SiO x (...

Embodiment 2

[0096] A coin-type secondary half cell was obtained in the same manner as in Example 1, except that the first negative electrode active material and the second negative electrode active material were used in a weight ratio of 10:90.

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Abstract

To provide an anode that satisfies the demand for high energy density while allowing high-speed charging of batteries. There is also provided a lithium secondary battery including the negative electrode. The negative electrode includes: a first negative electrode active material having a core including a silicon oxide-based compound and a carbon coating covering the core including the silicon oxide-based compound; and a second negative electrode active material having an artificial graphite core and a carbon coating covering the artificial graphite core.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2017-0164418 filed in Korea on Dec. 1, 2017, the disclosures of which are incorporated herein by reference. [0002] The present disclosure relates to a negative electrode for a lithium secondary battery and a lithium secondary battery including the same. Background technique [0003] Recently, in order to improve the energy density of negative electrode materials for lithium secondary batteries, active research has been conducted on metals such as Si. Specifically, the silicon-based negative electrode has a high silicon theoretical capacity of 4,200 mAh / g, which is at least 10 times higher than the theoretical capacity of the carbon-based negative electrode (370 mAh / g). In particular, silicon oxide has been intensively studied because among silicon-based materials, silicon oxide exhibits relatively insignificant volume expansion / contraction problems during charge / discharge. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M4/38H01M4/58H01M10/0525C23C16/26C23C16/44
CPCH01M4/485H01M4/587H01M10/0525Y02E60/10H01M2004/027H01M4/366H01M4/625H01M4/364H01M4/386H01M4/5825C23C16/26C23C16/4417H01M4/134H01M4/48
Inventor 申善英金东赫李龙珠金帝映李秀民
Owner LG ENERGY SOLUTION LTD