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

A negative electrode active material, negative electrode technology, applied in the direction of lithium battery, active material electrode, negative electrode, etc., can solve the problem of battery capacity reduction, achieve excellent charging and discharging characteristics, and improve the effect of Coulombic efficiency

Inactive Publication Date: 2009-07-29
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it results in a decrease in battery capacity

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 1.0 g of silicon powder (Noah Technology, USA) with an average diameter of 50 μm, 1.8 g of NiAl 3 Powder (Cerac, USA), 0.2 g of artificial graphite powder and 8 steel balls weighing 21 g were mixed in a hardened steel container. The vessel was filled with argon and sealed. The resulting mixture was then ground for 60 minutes using a mixer (SPEX Certiprep, USA, Model No. 8000M Mixer / Mill) to produce Si / NiAl 3 / Graphite composite negative electrode active material.

Embodiment 2

[0065] Composite negative active material was prepared in the same manner as in Example 1, except that 1.0 g of silicon powder (Noah Technology, USA) with an average diameter of 50 μm, 1.6 g of NiAl 3 and 0.4g of artificial graphite.

Embodiment 3

[0067] Composite negative electrode active material was prepared in the same manner as in Example 1, except using 1.0g of silicon powder (Nanostructured and Amorphous Materials, USA) with an average diameter of 100nm, 1.6g of NiAl 3 and 0.4g of artificial graphite.

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Abstract

A composite anode active material includes a metal that may be alloyed with lithium, an intermetallic compound incapable of alloying with lithium, and a carbonaceous material, wherein the intermetallic compound exists in a phase structurally separated from the metal capable of alloying with lithium. Since the composite active material contains an intermetallic compound that does not form any alloy phase with lithium nor the metal capable of alloying with lithium but rather exists in a structurally separated phase, the composite active material exhibits excellent coulombic efficiency. Further, anode electrodes and lithium batteries including the composite anode active material exhibit improved charge and discharge characteristics.

Description

technical field [0001] The invention relates to a composite negative electrode active material, a preparation method thereof, a negative electrode and a lithium battery containing the negative electrode active material. More particularly, the present invention relates to composite negative active materials including intermetallic compounds. 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. Specifically, metallic lithium has been the subject of extensive research due to its ability to impart high initial battery capacity. However, when metallic lithium is used as the anode material, a large amount of lithium can be deposited on the surface of the anode in the form of dendrites, which can degrade the charging and discharging efficiency of the battery or cause an internal short circuit between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/04H01M4/02H01M10/40H01M4/58H01M4/48H01M10/02
CPCY02E60/12Y02E60/10H01M4/133H01M4/134H01M4/364H01M4/38H01M4/386H01M4/387H01M4/466H01M4/587H01M10/052H01M2004/021H01M2004/027
Inventor 林东民金翰秀
Owner SAMSUNG SDI CO LTD