KR19980060803A - Method for producing a conductive agent and a secondary battery containing the conductive agent - Google Patents
Method for producing a conductive agent and a secondary battery containing the conductive agent Download PDFInfo
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- KR19980060803A KR19980060803A KR1019960080170A KR19960080170A KR19980060803A KR 19980060803 A KR19980060803 A KR 19980060803A KR 1019960080170 A KR1019960080170 A KR 1019960080170A KR 19960080170 A KR19960080170 A KR 19960080170A KR 19980060803 A KR19980060803 A KR 19980060803A
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Abstract
본 발명은 도전제의 제조방법 및 이 도전제를 포함하는 2차전지에 관한 것이다. 카본 블랙을 불활성 가스 분위기하에서 500 내지 1200℃의 온도로 열처리하여 표면의 작용기를 제거하여 도전제를 형성하는 것을 특징으로 하는 본 발명의 도전제의 제조방법에 따라 제조된 도전제를 채용한 2차전지는 용량이 크고 수명이 길다.The present invention relates to a method for producing a conductive agent and a secondary battery containing the conductive agent. Secondary electricity employing a conductive agent prepared according to the method for producing a conductive agent of the present invention, characterized in that the carbon black is heat-treated at a temperature of 500 to 1200 ℃ in an inert gas atmosphere to remove the functional groups on the surface. Loss of capacity and long life.
Description
본 발명은 도전제의 제조방법 및 이 도전제를 포함하는 2차전지에 관한 것으로서, 특히 카본 블랙을 열처리하여 표면에 존재하는 반응성이 큰 작용기들을 제거함으로써 도전성이 향상된 도전제의 제조방법 및 이 도전제를 포함하는 2차전지에 관한 것이다.The present invention relates to a method for preparing a conductive material and a secondary battery including the conductive material. In particular, a method for producing a conductive material having improved conductivity by removing carbonaceous heat from reactive functional groups present on the surface thereof and the conductive material A secondary battery comprising the agent.
카본 블랙은 천연 가스, 석유 등의 불완전 연소 또는 열분해에 의해 얻어지는 미세한 가루로 된 탄소로서, 도전성이 뛰어나고 표면적이 넓으며 화학적으로 안정하다는 특성을 갖고 있다.Carbon black is a fine powdered carbon obtained by incomplete combustion or pyrolysis of natural gas, petroleum, and the like, and has excellent electrical conductivity, wide surface area, and chemical stability.
이러한 카본 블랙의 뛰어난 도전성을 이용하여 2차전지, 즉, 니켈카드뮴 전지, 니켈수소전지, 액체리튬이온전지, 폴리머리튬이온전지, 플라스틱리튬이온전지에서는 전극의 활물질에 카본 블랙을 첨가하여 도전제로 사용하고 있는 것이 일반적이다.In the secondary battery, ie, nickel cadmium battery, nickel hydrogen battery, liquid lithium ion battery, polymer lithium ion battery, and plastic lithium ion battery, carbon black is added to the active material of the electrode and used as a conductive agent. It is common to do it.
도 1에는 카본 블랙의 구조식이 도시되어 있다. 도 1에 나타나 있듯이, 카본 블랙은 생성과정에서 형성된 페놀기 (1), 카르보닐기 (2), 카르복실기 (3), 퀴논기 (4), 락톤기 (5)등 반응성이 큰 작용기를 그 표면에 갖고 있다.1 shows the structural formula of carbon black. As shown in FIG. 1, carbon black has highly reactive functional groups such as phenol group (1), carbonyl group (2), carboxyl group (3), quinone group (4) and lactone group (5) formed in the production process have.
이로 인해, 카본 블랙이 첨가된 활물질을 극판에 도포하여 제조한 양극, 음극으로 전지를 구성했을 때, 활물질과 이들 작용기들간에, 불필요한 화학적, 전기화학적 반응이 일어난다. 그 결과, 전극을 구성하는 활물질이 분해되고 가스가 발생하여 전지의 용량 및 수명이 저하되고 내압이 증가되어 안정성이 떨어지는 문제점이 있었다.For this reason, when a battery is constituted by a positive electrode and a negative electrode prepared by applying an active material containing carbon black to an electrode plate, unnecessary chemical and electrochemical reactions occur between the active material and these functional groups. As a result, there is a problem in that the active material constituting the electrode is decomposed and gas is generated to decrease the capacity and life of the battery, increase the internal pressure, and decrease stability.
본 발명이 이루고자 하는 기술적 과제는 상기 문제점을 해결하여 카본 블랙 표면에 존재하는 작용기들을 제거함으로써 도전성을 향상시키는 도전제의 제조방법을 제공하는 것이다.The technical problem to be achieved by the present invention is to solve the above problems to provide a method for producing a conductive agent to improve the conductivity by removing the functional groups present on the carbon black surface.
본 발명이 이루고자 하는 다른 기술적 과제는 용량이 크고 수명이 긴 2차전지를 제공하는 것이다.Another technical problem to be achieved by the present invention is to provide a secondary battery having a large capacity and a long service life.
도 1은 카본블랙의 구조식을 나타내는 도면이다.1 is a view showing the structural formula of carbon black.
도 2는 본 발명의 열처리된 카본 블랙의 구조식을 나타내는 도면이다.2 is a view showing a structural formula of the heat treated carbon black of the present invention.
도 3은 열처리 온도에 따른 가스 발생량을 나타내는 그래프이다.3 is a graph showing the amount of gas generated according to the heat treatment temperature.
도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings
1.페놀기2. 카르보닐기1.Phenol group 2. Carbonyl group
3.카르복실기4. 퀴논기3. Carboxyl group 4. Quinones
5.락톤기5.lactone machine
상기 과제를 이루기 위하여 본 발명에서는, 카본 블랙을 불활성 가스 분위기하에서 500 내지 1200℃의 온도로 열처리하여 표면의 작용기를 제거하는 것을 특징으로 하는 도전제의 제조방법이 제공된다.In order to achieve the above object, the present invention provides a method for producing a conductive agent, characterized in that the carbon black is heat treated at an inert gas atmosphere at a temperature of 500 to 1200 ° C. to remove functional groups from the surface.
본 발명에 있어서, 상기 불활성 가스는 수소(H2),산소(N2), 헬륨(He), 아르곤(Ar)로 이루어진 군에서 선택된 적어도 하나인 것이 바람직하다.In the present invention, the inert gas is preferably at least one selected from the group consisting of hydrogen (H 2 ), oxygen (N 2 ), helium (He), argon (Ar).
본 발명에 있어서, 상기 제거되는 작용기는 페놀기, 카르보닐기, 카르복실기, 퀴논기 및 락톤기인 것이 바람직하다.In the present invention, the functional group to be removed is preferably a phenol group, a carbonyl group, a carboxyl group, a quinone group and a lactone group.
상기 다른 과제는 상기 제조방법에 의해 제조된 도전제를 활물질에 첨가하여 제조된 2차전지에 의해 이루어진다.The other object is achieved by a secondary battery prepared by adding a conductive agent prepared by the manufacturing method to an active material.
본 발명에서는 카본 블랙을 도전제로서 전지 활물질에 첨가하기 전에 전처리하여 도전성을 향상시켰다.In the present invention, carbon black is pretreated before addition to the battery active material as a conductive agent to improve conductivity.
이하, 본 발명에 대해 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail.
카본 블랙은 2차전지에서 도전제로 사용되는데 도 1에서와 같이 표면에 작용기, 특히 산소를 많이 포함하는 작용기가 존재한다. 이러한 카본 블랙은 전극 구성 물질과 불필요한 반응에 의해 전지 성능을 저하시킨다. 특히 리튬이온전지에서는 다음 예와 같은 반응이 일어난다.Carbon black is used as a conductive agent in a secondary battery, and as shown in FIG. 1, functional groups, especially oxygen-containing functional groups, exist on the surface. Such carbon black degrades battery performance due to unnecessary reaction with the electrode constituent material. In particular, in the lithium ion battery, the following reaction occurs.
2R-OH + 2Li++ 2e 2R-OLi + H2!?/P>2R-OH + 2Li + + 2e 2R-OLi + H 2 !? / P>
2R-COOH + 2Li + 2e 2R-COOH + H2!?/P>2R-COOH + 2Li + 2e 2R-COOH + H 2 !? / P>
상기와 같은 반응에 의해 리튬이온이 불필요하게 소모되어 전지의 용량이 ㄱ소되고, 또한 수소가스가 발생함으로 인해 전지의 내압이 증가하여 안정성이 저하된다.Lithium ions are unnecessarily consumed by the above reaction, and the capacity of the battery is reduced, and the internal pressure of the battery is increased due to the generation of hydrogen gas, thereby degrading stability.
따라서, 본 발명에서는 카본 블랙을 불활성 가스 분위기하에서 열처리하여 표면의 작용기를 제거하였다.Therefore, in the present invention, carbon black was heat-treated in an inert gas atmosphere to remove functional groups on the surface.
상기 열처리 온도는 500 내지 1200℃가 바람직하다. 이는 500℃ 미만이면, 반응이 불충분하게 일어나 표면의 작용기가 완전히 제거되지 않으며, 반면에 1200℃를 초과하면, 표면의 작용기가 제거되기 때문이다.The heat treatment temperature is preferably 500 to 1200 ° C. This is because if below 500 ° C., the reaction is insufficient to completely remove the functional groups on the surface, whereas if it exceeds 1200 ° C., the functional groups on the surface are removed.
특히, 리튬이온이 함유된 2차전지에서 도전제로 카본 블랙을 사용할 경우의 열처리 온도는 700 내지 1000℃가 더 바람직하다.In particular, in the case of using carbon black as a conductive agent in a secondary battery containing lithium ions, the heat treatment temperature is more preferably 700 to 1000 ° C.
본 발명의 열처리 방법에 따라 카본 블랙을 열처리하면 작용기가 CO 또는 CO2로 되어 카본 블랙 표면으로부터 제거된다. 따라서, 부반응에 의한 전지성능의 저하를 막고 결과적으로 도전성도 향상되는 이점이 있다.Heat treatment of the carbon black according to the heat treatment method of the present invention results in the removal of the functional groups from the carbon black surface as CO or CO 2 . Therefore, there is an advantage that the reduction of battery performance due to side reactions is prevented and consequently the conductivity is also improved.
이하, 실시예에 의거하여 본 발명을 설명하기로 하되, 본 발명이 반드시 이에 한정되는 것은 아니다.Hereinafter, the present invention will be described based on Examples, but the present invention is not necessarily limited thereto.
실시예 1∼2Examples 1-2
카본 블랙 VX, VXN 15(회사명; cabot)를 온도를 점차로 높여가며 열처리를 하였다. 이때 발생되는 CO 와 CO2의 양을 측정하여 그 결과를 도 3에 도시하였다.Carbon black VX, VXN 15 (company name; cabot) was heat-treated with increasing temperature gradually. The amount of CO and CO 2 generated at this time was measured and the results are shown in FIG. 3.
도 3에 나타나 있듯이, 500℃ 이상에서부터 CO와 CO2의 생성이 활발해지는 것을 알 수 있다. 이는 카본 블랙의 표면에 존재하던 작용기들이 CO와 CO2로 되어 제거됨을 뜻한다.As shown in Figure 3, it can be seen that the production of CO and CO 2 is active from 500 ℃ or more. This means that the functional groups that existed on the surface of the carbon black become CO and CO 2 and are removed.
상기 열처리된 카본 블랙을 전극의 활물질에 첨가하여 전지를 제조하고, 전지의 수명 및 용량을 측정하였다.The heat treated carbon black was added to the active material of the electrode to prepare a battery, and the life and capacity of the battery were measured.
비교예Comparative example
카본 블랙에 열처리를 하지 않았다는 것을 제외하고는, 실시예와 동일한 방법으로 전지를 구성하여 용량 및 수명을 측정하였다.Except that heat treatment was not performed on the carbon black, the battery was constructed in the same manner as in Example to measure the capacity and lifetime.
실시예 및 비교예의 전지에 대한 용량 측정 결과, 본 발명에 따라 제조된 카본 블랙을 도전제로 사용하여 2차전지를 구성할 경우 용량은 비교에의 경우에 비해 1 내지 10% 정도 증가되었다As a result of measuring the capacity of the battery of Examples and Comparative Examples, the capacity of the secondary battery using the carbon black prepared according to the present invention as a conductive agent was increased by about 1 to 10% compared to that of the comparison.
또한, 실시예의 전지 수명은 비교예에 비해 1 내지 10% 정도 증가되었다.In addition, the battery life of the Example was increased by about 1 to 10% compared to the Comparative Example.
이상에서 알 수 있는 바와 같이, 본 발명에 따라 카본 블랙을 열처리하여 표면의 산소함유 작용기를 제거하면, 2차전지 구성시 카본 블랙을 도전제로 사용할 경우 전지성능이 부반응에 의해 저해되는 효과를 막을 수 있다.As can be seen from the above, by removing the oxygen-containing functional groups on the surface by heat treatment of the carbon black according to the present invention, when the carbon black is used as a conductive agent in the secondary battery configuration, the cell performance can be prevented from being inhibited by side reactions. have.
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019960080170A KR19980060803A (en) | 1996-12-31 | 1996-12-31 | Method for producing a conductive agent and a secondary battery containing the conductive agent |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019960080170A KR19980060803A (en) | 1996-12-31 | 1996-12-31 | Method for producing a conductive agent and a secondary battery containing the conductive agent |
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| KR19980060803A true KR19980060803A (en) | 1998-10-07 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5725672A (en) * | 1980-07-23 | 1982-02-10 | Toshiba Battery Co Ltd | Battery |
| JPS60115665A (en) * | 1983-11-25 | 1985-06-22 | Kyowa Yuka Kk | Method for reforming carbon black |
| JPH0547387A (en) * | 1991-08-20 | 1993-02-26 | Sanyo Electric Co Ltd | Nonaqueous electrolyte battery |
| JPH08250117A (en) * | 1995-03-09 | 1996-09-27 | Shin Kobe Electric Mach Co Ltd | Carbon material for lithium secondary battery negative electrode, and manufacture thereof |
-
1996
- 1996-12-31 KR KR1019960080170A patent/KR19980060803A/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5725672A (en) * | 1980-07-23 | 1982-02-10 | Toshiba Battery Co Ltd | Battery |
| JPS60115665A (en) * | 1983-11-25 | 1985-06-22 | Kyowa Yuka Kk | Method for reforming carbon black |
| JPH0547387A (en) * | 1991-08-20 | 1993-02-26 | Sanyo Electric Co Ltd | Nonaqueous electrolyte battery |
| JPH08250117A (en) * | 1995-03-09 | 1996-09-27 | Shin Kobe Electric Mach Co Ltd | Carbon material for lithium secondary battery negative electrode, and manufacture thereof |
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