Negative active material for rechargeable lithium battery and rechargeable lithium battery including same

A negative electrode active material, lithium battery technology, applied in active material electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as volume expansion, and achieve the effect of improving expansion characteristics and excellent cycle life characteristics

Active Publication Date: 2019-11-26
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite of silicon and carbon has a problem that volume expansion occurs significantly during charge and discharge

Method used

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  • Negative active material for rechargeable lithium battery and rechargeable lithium battery including same
  • Negative active material for rechargeable lithium battery and rechargeable lithium battery including same
  • Negative active material for rechargeable lithium battery and rechargeable lithium battery including same

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Embodiment Construction

[0022] Hereinafter, embodiments of the present invention are described in detail. However, these embodiments are exemplary, the present invention is not limited thereto, and the present invention is defined by the scope of the claims.

[0023] A negative electrode active material for a rechargeable lithium battery according to an embodiment of the present invention includes a composite of silicon and crystalline carbon, wherein the silicon has an average particle diameter (D50) of about 10 nm to about 150 nm, and the crystalline carbon has an average particle diameter of about 5 μm to about 5 μm. An average particle size (D50) of about 20 μm and an aspect ratio of about 4 to about 10.

[0024] As used herein, when no definition is otherwise provided, the average particle diameter (D50) means the particle diameter in the particle distribution at which the cumulative volume is about 50% by volume.

[0025] The silicon may have an average particle diameter (D50) of about 10 nm t...

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Abstract

Disclosed are a negative electrode active material for a rechargeable lithium battery and the rechargeable lithium battery including the same, the negative electrode active material is a composite ofsilicon and crystalline carbon, in which the silicon has an average particle diameter (D50) of about 10 nm to about 150 nm, the crystalline carbon has an average particle diameter (D50) of about 5 [mu]m to about 20 [mu]m, and an aspect ratio of about 4 to about 10.

Description

technical field [0001] A negative active material for a rechargeable lithium battery and a rechargeable lithium battery including the negative active material are disclosed. Background technique [0002] Due to the increasing demand for batteries for mobile devices or portable batteries, technological development for realizing high capacity of rechargeable lithium batteries has been continuously conducted. [0003] As an electrolyte for a rechargeable lithium battery, a lithium salt dissolved in an organic solvent has been used. [0004] For positive active materials for rechargeable lithium batteries, lithium-transition metal oxides with structures capable of intercalating lithium ions, such as LiCoO, have been used. 2 , LiMn 2 o 4 、LiNi 1-x co x o 2 (0<x<1) etc. [0005] For the negative electrode active material, various carbon-based materials capable of intercalating / deintercalating lithium (such as artificial graphite, natural graphite, and hard carbon) or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/052H01M10/058
CPCH01M4/366H01M4/587H01M4/625H01M10/052H01M10/058H01M2220/30H01M2004/027H01M4/386H01M10/0525H01M4/362Y02E60/10Y02P70/50H01M4/364H01M4/133H01M4/1393H01M4/583
Inventor 金荣敏
Owner SAMSUNG SDI CO LTD
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