Composite negative active material, method of preparing the same, and lithium secondary battery including the same

A negative electrode active material and negative electrode technology, applied in the field of composite negative electrode active materials, its preparation method and lithium secondary batteries including it, can solve the problems of deterioration of cycle life characteristics, and achieve the effect of improving cycle life characteristics

Inactive Publication Date: 2013-06-05
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle life characteristics of non-carbon-based materials can deteriorate due to their volume expansion and contraction during lithium intercalation and deintercalation

Method used

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  • Composite negative active material, method of preparing the same, and lithium secondary battery including the same
  • Composite negative active material, method of preparing the same, and lithium secondary battery including the same
  • Composite negative active material, method of preparing the same, and lithium secondary battery including the same

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preparation example Construction

[0079] As another aspect of the present invention, the preparation method of the composite negative electrode active material includes: heat-treating the mixture of the pore-forming agent and the carbon precursor to form a composite of the pore-forming agent and carbon; etching the pore-forming agent to form a nanoporous porous carbon; impregnating the porous carbon with a solution containing a catalyst precursor to form a catalyst-impregnated porous carbon; and introducing a metal precursor into the catalyst-impregnated porous carbon to grow metal nanostructures in the pores .

[0080] In the preparation method of the composite negative electrode active material, a mixture is formed by mixing a pore forming agent and a carbon precursor.

[0081] The pore forming agent may be silicon oxide, and for example may be SiO 2 . The pore forming agent may form nanopores having a predetermined size, and may, for example, be a powder or a particle having a size ranging from about 30 n...

preparation Embodiment 1

[0133] SiO with an average diameter of about 80 nm 2 The nanopowder and petroleum-based pitch (AR mesophase pitch, Mitsubishi Gas Chemical Co., Ltd.) were mixed in a weight ratio of about 50:50. The mixture was heat-treated at about 1000°C for 3-5 hours in a nitrogen atmosphere and carbonized to form SiO 2 and carbon composites. The composite was etched by immersion in a 5M NaOH solution for about 24 hours to produce a porous carbon with an average pore diameter of about 80 nm. The integrated intensity ratio D / G(I of the Raman D-line and G-line of the porous carbon 1360 / I 1580 ) is about 1.8, and the SEM micrograph of the prepared porous carbon is shown in figure 1 middle.

Embodiment 1

[0140] About 2 g of the porous carbon prepared in Preparation Example 1 was impregnated in about 200 cc of 0.001M HAuCl 4 (Sigma-Aldrich Corporation) in ethanol and stirred for about 24 hours. Au-impregnated porous carbon powder was then prepared by slowly drying ethanol at about 80°C and heat treating at about 500°C for about 6 hours. The porous carbon powder was placed in a small tube with holes in its front and back sides, and the holes in the two sides were plugged with quartz hairs to prevent the powder from being blown during pumping in the CVD chamber. Walk. About 10sccm silane (SiH4 , about 10% diluted H 2 gas) gas was injected into the CVD chamber to create a total pressure of about 8 Torr. A vial placed in the center of the CVD chamber was heated at about 490°C for about 5 minutes. The temperature was lowered to about 440° C. for about 10 minutes and then kept for about 2 hours to obtain a composite negative active material in which Si nanowires were grown in por...

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Abstract

A composite negative active material including metal nanostructures disposed on one or more of a surface and inner pores of a porous carbon-based material, a method of preparing the material, and a lithium secondary battery including the material.

Description

technical field [0001] The present disclosure relates to a composite negative active material, a preparation method thereof, and a lithium secondary battery including the same, and more particularly, to a composite negative active material having improved lifetime characteristics, a preparation method thereof, and a lithium secondary battery including the same. Background technique [0002] Lithium secondary batteries used in portable electronic devices for information and telecommunication such as personal digital assistants (PDAs), mobile phones and notebook computers, or electric bicycles and electric vehicles have a discharge voltage twice or more that of ordinary batteries discharge voltage, and thus, lithium secondary batteries may exhibit high energy density. [0003] In a state where a lithium secondary battery including an organic electrolyte or a polymer electrolyte between a positive electrode and a negative electrode containing an active material capable of inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/0525
CPCH01M4/133Y02E60/122H01M4/1393Y02T10/7011H01M10/0525H01M4/1395H01M4/364H01M4/38H01M4/587H01M4/386H01M4/366H01M4/134Y02E60/10H01M4/139H01M4/583H01M10/052Y02T10/70
Inventor 朴晋煥黄同穆禹先确
Owner SAMSUNG ELECTRONICS CO LTD
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