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Anode active material for lithium secondary battery, manufacturing method thereof, and lithium secondary battery including same

A technology of lithium secondary battery and anode activity, which is applied in electrode manufacturing, battery electrode, lithium storage battery, etc., to achieve the effect of improving life characteristics and simple mass production.

Active Publication Date: 2013-12-25
UNIST ULSAN NAT INST OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, silicon has serious problems for use in lithium batteries

Method used

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  • Anode active material for lithium secondary battery, manufacturing method thereof, and lithium secondary battery including same
  • Anode active material for lithium secondary battery, manufacturing method thereof, and lithium secondary battery including same
  • Anode active material for lithium secondary battery, manufacturing method thereof, and lithium secondary battery including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] A solution in which 5M hydrogen fluoride and 10 mM silver nitrate aqueous solution were mixed in the same volume was prepared, and powdered silicon was immersed in the solution for about 5 minutes.

[0142] The silicon powder in the aqueous solution state on which silver was coated by the above steps was washed several times to remove excess deposited silver, filtered, and dried in a vacuum state at 150° C. for about 1 hour to manufacture silicon powder on which silver was deposited.

[0143] Separately, an aqueous solution in which 5M hydrogen fluoride and 1.3M hydrogen peroxide were mixed in an amount of 60 mL each was prepared. The prepared aqueous solution was properly mixed and then heated in boiling water to raise its temperature to 50°C. Then, the silicon powder on which the silver was coated was immersed for about 30 minutes to manufacture an anode active material having pores selectively etched according to a catalytic etching method and having a size of about ...

Embodiment 2

[0148] A solution in which 5M hydrogen fluoride and 10 mM silver nitrate aqueous solution were mixed in the same volume was prepared, and powdered silicon was immersed for about 3 minutes and stirred.

[0149] Silver particles are deposited on the surface of silicon in a powder state through the above steps. The silicon powder in the aqueous solution state on which the silver was deposited was washed several times to remove excess deposited silver, and then dried in a vacuum state at 150° C. for about 1 hour to manufacture the silicon powder on which the silver was deposited.

[0150] In addition, 4.6M hydrogen fluoride and 0.135M iron nitrate (Fe(NO 3 ) 3 ) Aqueous solutions mixed in an amount of 60 mL each. The prepared aqueous solution was properly mixed and then heated in boiling water to raise its temperature to 70°C. Then, the silicon powder on which the silver was deposited was immersed for about 4 hours to manufacture an anode active material according to the cataly...

Embodiment 3

[0155] An aqueous solution in which 5M hydrogen fluoride and 10 mM silver nitrate aqueous solution were mixed in the same volume of 100 ml was prepared.

[0156] The prepared aqueous solution was properly mixed and then heated in boiling water to raise its temperature to 50°C. Then, immerse the prepared silicon powder and stir for about 5 hours to prepare silicon powder according to the improved one-step manufacturing method compared with the methods of Example 1 and Example 2.

[0157] That is, the surface of the silicon powder is etched without a separate etching step.

[0158] The silicon powder in the aqueous solution state was washed several times to remove excess deposited silver, filtered, and dried under vacuum at 150° C. for about 1 hour.

[0159] Increase the temperature of nitric acid to 50° C. to remove remaining silver on the silicon powder produced by the above method, and then immerse the silicon powder for about 2 hours.

[0160] Then, carbon coating was perf...

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Abstract

The present invention relates to an anode active material for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery including the same. The invention can provide an anode active material for a lithium secondary battery with low volume expansion when a lithium secondary battery is charged / discharged using the anode active material for a lithium secondary battery which comprises: a material capable of doping and dedoping lithium; and a plurality of outer pores with a size of 0.1-3[mu]m which are formed on the surface of the material capable of doping and dedoping lithium, wherein the material capable of doping and dedoping lithium comprises Si.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2011-0035286 filed with the Korean Intellectual Property Office on Apr. 15, 2011, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an anode active material for a lithium secondary battery, a method of manufacturing it, and a lithium secondary battery comprising the same. Background technique [0004] In the original lithium secondary battery, lithium ions are often used as an anode material, and lithium metal has an advantage in that a high capacity is obtained. However, dendritic growth occurs due to dissolution or precipitation by ionization of lithium metal according to repeated charge and discharge. Therefore, an internal short circuit occurs in the battery, and thus problems concerning the stability of the battery largely arise. Furthermore, a strong exoth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/052H01M4/04
CPCH01M4/134H01M4/386Y02E60/10H01M4/36H01M4/38H01M10/052H01M4/04
Inventor 朴寿真曺在弼宋炫坤
Owner UNIST ULSAN NAT INST OF SCI & TECH
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