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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 volume expansion and contraction, so there is a problem that the cycle characteristics of the battery are lowered.

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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