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Anode active material, method of preparing the same, anode and lithium battery containing the material

A negative active material and negative electrode technology, applied in the direction of active material electrodes, negative electrodes, electrode manufacturing, etc., can solve the problems of large irreversible capacity, hindering practical use, and undesired cycle characteristics of secondary lithium-ion batteries, etc., to achieve excellent charging and Effect of Discharge Characteristics

Active Publication Date: 2009-08-19
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the initial charge-discharge cycle phase, the irreversible capacity is quite large, endowing secondary Li-ion batteries with undesirable cycle characteristics and hindering practical use.

Method used

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  • Anode active material, method of preparing the same, anode and lithium battery containing the material
  • Anode active material, method of preparing the same, anode and lithium battery containing the material
  • Anode active material, method of preparing the same, anode and lithium battery containing the material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 1.05 g of a 0.53 mm thick Li membrane and 30 ml tetrahydrofuran (THF) were added to a 100 ml flask and mixed. The mixture was then placed in an ice bath. Then, 5cc trichlorosilane (HSiCl 3 , Aldrich) was added to the flask, and the mixture was allowed to react for 24 hours. 10 ml of ethanol was slowly added to the mixture and reacted for 3 hours. The resulting product was filtered with 0.5 μm filter paper, washed sequentially with ethanol, distilled water and acetone, and dried in an oven at 60° C. to obtain a partially oxidized silicon oxide precursor. The silicon oxide precursor was heat-treated at 900° C. in a nitrogen atmosphere to obtain silicon oxide.

Embodiment 2

[0069] 0.2 g of the silica precursor prepared according to Example 1 and 0.08 g of pitch were mixed in 10 ml of THF. The solvent was evaporated for 1 h while the mixture was sonicated and stirred. The dried resulting product was heat-treated at 900° C. in a nitrogen atmosphere to obtain silicon oxide covered with carbonaceous material.

Embodiment 3

[0071] 1.05 g of a 0.08 mm thick Li membrane and 30 ml tetrahydrofuran (THF) were added to a 100 ml flask and mixed. The mixture was placed in an ice bath. Then, 5cc trichlorosilane (HSiCl 3 , Aldrich) was added to the flask, and the mixture was allowed to react for 24 hours. 10 ml of ethanol was slowly added to the mixture and reacted for 3 hours. The resulting product was filtered with 0.5 μm filter paper, washed sequentially with ethanol, distilled water and acetone, and dried in an oven at 60° C. to obtain a partially oxidized silicon oxide precursor. Then, 0.2 g of this silica precursor and 0.08 g of pitch were mixed in 10 ml of THF. The solvent was evaporated for 1 h while the mixture was sonicated and stirred. The dried resulting product was heat-treated at 900° C. in a nitrogen atmosphere to obtain silicon oxide covered with a carbonaceous material.

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PUM

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Abstract

Silicon oxide based anode active materials are provided. In one embodiment, the active materials include silicon oxides represented by the general formula SiOx, where 0<x<0.8. The anode active materials include silicon oxides having low oxygen contents. Further, anodes and lithium batteries employing such anode active materials have excellent charge-discharge characteristics.

Description

technical field [0001] The invention relates to a negative electrode active material, a preparation method thereof, a negative electrode containing the negative electrode active material, and a lithium battery. More particularly, the present invention relates to a negative electrode active material including silicon oxide having a low oxygen content. Background technique [0002] In an effort to achieve high voltage and energy density, extensive research and development has been conducted on non-aqueous electrolyte secondary batteries using lithium compounds as negative electrodes. In particular, metallic lithium has been the subject of extensive research due to its ability to impart high initial battery capacity. Lithium has thus received much attention as an outstanding anode material. However, when metallic lithium is used as an anode material, a large amount of lithium is deposited on the surface of the anode in the form of dendrites, which can degrade charge and disch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/36H01M4/58H01M4/02H01M4/04H01M10/40C01B33/113H01M4/38
CPCH01M2004/027Y02E60/122C01B33/113H01M4/131H01M10/0525H01M4/1395H01M4/134H01M4/485H01M4/1391Y02E60/10H01M4/04H01M4/48
Inventor 马相国金翰秀
Owner SAMSUNG SDI CO LTD
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