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Cathode active material of rechargeable lithium battery and rechargeable lithium battery

A negative electrode active material and lithium battery technology, applied in battery electrodes, lithium batteries, active material electrodes, etc., can solve problems such as volume expansion, negative electrode performance deterioration, shrinkage, etc.

Active Publication Date: 2004-08-18
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, mechanically pulverized Si powder has a wide diameter distribution, and it includes coarse particles with a diameter of about 1 μm, which often undergo volume expansion and contraction, leading to the deterioration of anode performance.

Method used

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  • Cathode active material of rechargeable lithium battery and rechargeable lithium battery
  • Cathode active material of rechargeable lithium battery and rechargeable lithium battery
  • Cathode active material of rechargeable lithium battery and rechargeable lithium battery

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Embodiment 1

[0054] Put the silicon pre-placed in the vacuum chamber at a pressure of 5×10 4 Pa in a helium atmosphere by arc heating to 1700°C to create a silicon atmosphere. The resulting silicon atmosphere is cooled under a helium atmosphere to agglomerate and form ultrafine particles. Ultrafine particles adhere to the inner surface of the vacuum tank. This process was continued for 4 hours to produce silicon ultrafine particles as the negative electrode active material.

[0055] The diameters of the obtained particles were measured using an electron microscope, and were found to be 10nm-200nm in diameter, and they seemed to consist of figure 1 Separated ultrafine particles as shown, such as figure 2 The linearly connected ultrafine particles shown and as image 3 Ultrafine particles agglomerated into agglomerates are shown. The Raman shift measured by Raman spectroscopy is at 500cm -1 A peak and full width at half maximum are shown at 15cm -1 .

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Abstract

Disclosed is a negative active material for a rechargeable lithium battery including ultra-fine particles comprising an element which is capable of alloying with lithium. The particles have a diameter of 1 nm to 200 nm, a Raman shift of 480 cm<-1 >to 520 cm<-1 >measured by Raman Spectroscopy, and a full width at half-maximum of 10 cm<-1 >to 30 cm<-1>.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to Japanese Application No. 2003-447 filed with the Japan Patent Office on January 6, 2003 and Korean Patent Application No. 10-2004-263 filed with the Korean Intellectual Property Office on January 5, 2004, all of which The disclosure is incorporated herein by reference. field of invention [0003] The present invention relates to a negative electrode active material for a rechargeable lithium battery and a rechargeable lithium battery comprising the negative electrode active material, and more particularly to a negative electrode active material for a rechargeable lithium battery exhibiting good cycle life performance. Background of the invention [0004] Although research to develop high-capacity anode active materials based on metallic substances such as Si, Sn, and Al has been actively conducted, such research has not been successful in applying metals to anode active materials. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/134H01M4/36H01M4/38H01M10/052H01M10/36
CPCH01M4/38Y02E60/122H01M4/134H01M10/052H01M2004/021H01M4/386Y02E60/10
Inventor 沈揆允松原惠子津野利章高椋辉
Owner SAMSUNG SDI CO LTD