Negative electrode active material comprising porous silicon oxide-carbon material composite and preparation method thereof

A negative electrode active material and oxide technology, which is applied in the field of negative electrode active materials comprising porous silicon oxide-carbon material composites and their preparation, can solve the problems of cycle characteristics and lifespan decline, uneven distribution of graphite, etc., and achieve improved lifespan properties, improved conductivity, improved resistance effects

Active Publication Date: 2016-11-16
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since graphite may be unevenly distributed during mixing, cycle characteristics and life may decrease

Method used

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  • Negative electrode active material comprising porous silicon oxide-carbon material composite and preparation method thereof
  • Negative electrode active material comprising porous silicon oxide-carbon material composite and preparation method thereof
  • Negative electrode active material comprising porous silicon oxide-carbon material composite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Example 1: Preparation of porous silicon oxide-carbon material composite 1

[0050] Porous SiO was impregnated in an aqueous solution containing iron nitrate. Next, the iron catalyst was bound to the surface and inside of the pores of the porous silicon oxide by drying the mixture thus obtained.

[0051] The porous silicon oxide combined with the metal catalyst was put into a CVD chamber, and then a mixed gas containing hydrocarbon gas such as ethane and inert gas such as nitrogen, helium, and argon was supplied, and heated at 800° C. Carbon nanotubes (CNTs) are formed on the surface and inside the pores. Thus, a porous silicon oxide-carbon material composite was prepared.

[0052] In this case, the amount of carbon nanotubes was 5% by weight based on 100% by weight of the porous silicon oxide-carbon material composite. In addition, the average diameter of the carbon nanotubes was 50 nm, and the average length thereof was 2 μm. The average diameter of the pores cont...

Embodiment 2

[0053] Embodiment 2: Preparation 2 of porous silicon oxide-carbon material composite

[0054] A porous silicon oxide-carbon material composite was prepared in the same manner as in Example 1, except that, based on 100% by weight of the porous silicon oxide-carbon material composite, the amount of carbon nanotubes formed was 1 weight%. The average diameter of the pores contained in the porous silicon oxide-carbon material composite was about 200 nm when measured from the surface of the composite using SEM.

Embodiment 3

[0055] Embodiment 3: Preparation 3 of porous silicon oxide-carbon material composite

[0056] A porous silicon oxide-carbon material composite was prepared in the same manner as in Example 1, except that, based on 100% by weight of the porous silicon oxide-carbon material composite, the amount of carbon nanotubes formed was 10 weight%. The average diameter of the pores contained in the porous silicon oxide-carbon material composite was about 200 nm when measured from the surface of the composite using SEM.

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Abstract

The invention provides a negative electrode active material, comprising a porous silicon oxide-carbon material composite, the porous silicon oxide-carbon material composite comprising: porous silicon oxide containing pores and coated on the porous silicon oxide A linear carbon material on the surface, in the pores, or on the surface and in the pores; and a method for preparing the negative active material. Since the silicon oxide of the negative active material according to the embodiment of the present invention may contain a plurality of pores, resistance to mechanical stress caused by volume change may be improved. Furthermore, since the linear carbon material is incorporated inside pores, electrical conductivity may not decrease even if internal cracks are generated in the porous silicon oxide, and lifetime characteristics may be improved.

Description

technical field [0001] The invention relates to a negative electrode active material comprising a porous silicon oxide-carbon material composite and a preparation method thereof. Background technique [0002] In line with the recent trend of miniaturization and weight reduction of electronic devices, miniaturization and weight reduction of batteries serving as power sources are also required. Lithium-based secondary batteries have been commercialized as batteries that can be miniaturized, light-weighted, and charged to a high capacity, and lithium-based secondary batteries have been used in portable electronic devices such as small video cameras, mobile phones, and notebooks and communication devices . [0003] As energy storage devices with high energy and power, lithium secondary batteries may be advantageous in that their capacity or operating voltage is higher than that of other types of batteries. However, since the safety of the battery may be problematic due to high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M4/583H01M4/133H01M10/052
CPCB82Y30/00C04B35/14C04B2235/526C04B2235/5264C04B2235/5288C04B2235/79H01M4/13H01M4/362H01M4/483H01M4/587H01M4/625H01M10/052Y02E60/10H01M4/134H01M4/48H01M4/583
Inventor 柳正宇金帝映李龙珠崔丞延姜允雅李美林郑惠兰
Owner LG ENERGY SOLUTION LTD
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