Si/c composite, method for manufacturing same, and cathode active material including same for lithium secondary battery

A composite and negative electrode technology, which is applied in the field of Si/C composite and its preparation, can solve the problems such as the decrease of battery cycle characteristics, and achieve the effect of improving electrical conductivity and life-span characteristics

Active Publication Date: 2014-11-12
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during charging and discharging, metals such as Si, Sn, or Al are alloyed with lithium to cause volu

Method used

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  • Si/c composite, method for manufacturing same, and cathode active material including same for lithium secondary battery
  • Si/c composite, method for manufacturing same, and cathode active material including same for lithium secondary battery
  • Si/c composite, method for manufacturing same, and cathode active material including same for lithium secondary battery

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preparation example Construction

[0048] refer to figure 1 , The preparation method of the Si / C composite of an embodiment of the present invention may include: i) mixing an aromatic alkoxysilane compound represented by the following chemical formula 1 with an organic solvent to form SiO 2 / C complex step, ii) the SiO obtained from step (i) 2 After the / C complex is mixed with an alkali metal or an alkaline earth metal, heat-treating it in an inert atmosphere, thereby reducing the above-mentioned silica, and, iii) performing a heat-treated product obtained in the above-mentioned step (ii) Acid treatment whereby the step of removing oxides;

[0049] Chemical formula 1:

[0050] SiR 1 n R 2 4-n ,

[0051] In the above formula,

[0052] R 1 is phenyl,

[0053] R 2 for C 1 to C 4 alkoxy,

[0054] n is 1 to 3.

[0055] The above step i) is to form SiO 2 The step of / C complex can be obtained by adding the aromatic alkoxysilane compound represented by the above chemical formula 1 to an organic solvent,...

preparation example 1

[0102] Step (i): Preparation of SiO 2 / C complex

[0103] In a 3000ml flask, phenyltriethoxysilane (PTES) (0.82g): tetraethylorthosilicate (TEOS) (41.81g) was mixed at a molar ratio of 1:59 and mixed together with 1400g of ethanol . After the mixture was stirred for 5 minutes at normal temperature in an atmospheric atmosphere, a mixture of 34% ammonia water and deionized water (DIW) was slowly added dropwise, and after stirring for 3 hours, it was allowed to cool at normal temperature. React until gelation occurs. The gel was dried to prepare C / SiO 2 SiO with a ratio of 0.1 2 / C complex.

preparation example 2

[0105] In addition to using PTES:TEOS at a molar ratio of 1:11 in the above-mentioned Preparation Example 1, proceed in the same manner as Preparation Example 1, thus obtaining C / SiO 2 SiO with a ratio of 0.5 2 / C complex.

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Abstract

Provided are a Si/C composite, in which carbon (C) is dispersed in an atomic state in a silicon (Si) particle, and a method of preparing the Si/C composite. Since the Si/C composite of the present invention is used as an anode active material, electrical conductivity may be further improved and volume expansion may be minimized. Thus, life characteristics of a lithium secondary battery may be improved.

Description

technical field [0001] The invention relates to a Si / C composite, a preparation method thereof, and a negative electrode active material for a lithium secondary battery containing the Si / C composite. Background technique [0002] Lithium secondary batteries, which have recently attracted attention as power sources for portable and small electronic devices, use an organic electrolyte to exhibit a high discharge voltage that is more than twice as high as conventional batteries using an aqueous alkaline solution. High energy density battery. [0003] Graphite is mainly used as a negative electrode material for lithium secondary batteries, but graphite has a relatively small capacity per unit mass of 372 mAh / g, so it is difficult to increase the capacity of lithium secondary batteries. [0004] Examples of negative electrode materials exhibiting higher capacity than graphite include materials that form intermetallic compounds with lithium, such as silicon, tin, and oxides there...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/58H01M10/02
CPCH01M4/583H01M10/02H01M4/58H01M4/0404H01M4/134H01M4/1395H01M4/364H01M4/386H01M4/587H01M10/052Y02E60/10
Inventor 柳志勋朴洪奎郑王谟姜盛中赵治皓韩玑范
Owner LG ENERGY SOLUTION LTD
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