KR19990084563A - Manufacturing method of active material slurry of secondary battery - Google Patents
Manufacturing method of active material slurry of secondary battery Download PDFInfo
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- KR19990084563A KR19990084563A KR1019980016433A KR19980016433A KR19990084563A KR 19990084563 A KR19990084563 A KR 19990084563A KR 1019980016433 A KR1019980016433 A KR 1019980016433A KR 19980016433 A KR19980016433 A KR 19980016433A KR 19990084563 A KR19990084563 A KR 19990084563A
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- South Korea
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- active material
- conductive agent
- organic solvent
- secondary battery
- minutes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
목적 : 이차전지의 활물질 슬러리 제조방법에 관한 것으로, 특히 활물질과 도전제의 혼합 불량에 의해 극판에서 2차 입자가 발생되는 것을 해결하고자 한다.PURPOSE: It relates to a method for producing an active material slurry of a secondary battery, and in particular, to solve the occurrence of secondary particles in the electrode plate due to a poor mixing of the active material and the conductive agent.
구성 : 용기에 유기 용매와 도전제를 함께 투입하고 적어도 30분 동안 교반하여 상기 도전제의 표면에 유기 용매가 고르게 분포되게 하고, 이렇게 교반된 혼합물에 활물질을 투입하고 적어도 30분 동안 교반하여 상기 활물질의 표면에 도전제가 코팅되게 하는 방법으로 행하여짐을 특징으로 한다.Composition: An organic solvent and a conductive agent are added together in a container and stirred for at least 30 minutes to evenly distribute the organic solvent on the surface of the conductive agent, and an active material is added to the stirred mixture and stirred for at least 30 minutes to form the active material. It characterized in that it is carried out by the method so that the surface of the conductive agent is coated.
효과 : 상기한 유기 용매는 도전제와 먼저 혼합되므로 그 도전제의 표면에 고르게 분산되어, 그 후 투입되는 활물질과 도전제의 혼합이 잘 이루어지도록 하는 것이므로, 도전제와 활물질의 엉김에 의해 발생되는 2차 입자 발생을 방지할 수 있다.Effect: Since the organic solvent is first mixed with the conductive agent, the organic solvent is uniformly dispersed on the surface of the conductive agent so that the active material and the conductive agent mixed thereafter are well mixed. Secondary particle generation can be prevented.
Description
본 발명은 전극 활물질과 도전제 및 유기 용매의 혼합 공정을 변경하여, 활물질과 도전제의 혼합이 잘 이루어지도록 하고, 극판의 2차 입자(또는 덩어리)가 방지되도록 하는데 적합하게 이용될 수 있는 이차전지의 활물질 슬러리 제조방법에 관한 것이다.The present invention changes the mixing process of the electrode active material, the conductive agent and the organic solvent, so that the mixing of the active material and the conductive agent is well done, and the secondary that can be suitably used to prevent the secondary particles (or lumps) of the electrode plate is prevented It relates to a method for producing an active material slurry of a battery.
이차전지는 재충전이 가능하고 소형 및 대용량화가 가능한 것으로, 대표적으로 니켈수소(Ni-MH)전지, 리튬(Li)전지 및 리튬이온(Li-ion)전지가 사용되고 있다.Rechargeable batteries can be recharged, miniaturized, and large-capacity, and typically, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) batteries are used.
지금까지 알려진 이차전지에서 리튬이온전지는 정극 활물질로 리튬-천이금속산화물이 사용되고, 부극 활물질로 리튬금속, 리튬합금, 탄소 혹은 탄소복합체가 사용되며, 산소기, 질소기, 황산기 등을 포함한 한 개 이상의 유기 용매에 리튬염을 녹인 전해액이 사용된 것으로, 정극과 부극간에 리튬 이온이 이동되어 기전력을 발생시키므로서 충·방전이 이루어지도록 한다.Lithium-ion batteries in secondary batteries known to date are used as lithium-transition metal oxides as positive electrode active materials, lithium metal, lithium alloys, carbon or carbon complexes as negative electrode active materials, at least one including oxygen, nitrogen, sulfate An electrolyte solution in which a lithium salt is dissolved in an organic solvent is used, and lithium ions are moved between the positive electrode and the negative electrode to generate an electromotive force, thereby charging and discharging.
이러한 리튬이온전지에서 정극의 제조방법은 리튬-천이금속 산화물로 된 활물질과, 카본으로 된 도전제와, PVDF(polyvinylidene fluoride)로 된 바인더 및 NMP(N-methyl pyrrolidone)로 된 유기 용매를 혼합하여 슬러리를 제조한 다음, 이것을 진공 분리 후 알루미늄 호일로 된 기재에 코팅하고, 건조, 압연함으로써 제조되어 진다.In the lithium ion battery, a method of manufacturing a positive electrode is obtained by mixing an active material made of lithium-transition metal oxide, a conductive material made of carbon, a binder made of polyvinylidene fluoride (PVDF), and an organic solvent made of N-methyl pyrrolidone (NMP). After the slurry is prepared, it is prepared by vacuum separation, coating on a substrate made of aluminum foil, drying and rolling.
이와 같이 제조되는 활물질은 기본적으로 전도성이 없는 것이므로 그 전도도를 높이기 위해 구(球)형으로 된 활물질 입자의 표면에 도전제가 코팅되게 하여 도전 네트워크를 형성하는 것이다.Since the active material prepared as described above is basically non-conductive, a conductive network is formed by coating a conductive agent on the surface of the spherical active material particles in order to increase its conductivity.
그러나 앞에서 설명된 종래의 제조방법에 의하면, 도전제의 확산 효과가 저조하여 활물질과의 혼합이 잘 이루어지지 못하는 문제점이 있다. 또, 이와 같이 제조된 활물질 슬러리는 기재에 코팅될 때 불량한 2차 입자를 발생시키게 된다.However, according to the conventional manufacturing method described above, there is a problem in that the diffusion effect of the conductive agent is low and the mixing with the active material is not well achieved. In addition, the active material slurry prepared as described above generates poor secondary particles when coated on a substrate.
또한, 상기 도전제와 활물질의 혼합이 잘 이루어지도록 하기 위해 유기 용매를 다단계로 투입할 수 있는데, 이 경우에는 슬러리의 제조 공정에 장시간이 소요되는 문제점이 있다.In addition, in order to achieve a good mixing of the conductive agent and the active material, an organic solvent may be added in multiple stages. In this case, there is a problem that a long time is required for the slurry manufacturing process.
상술한 종래 기술의 문제점을 해소하기 위한 목적에서 안출된 것으로, 본 발명은 도전제와 활물질의 혼합이 잘 이루어지도록 하는 방안으로 혼합 공정을 변경하여, 2차 입자의 발생이 방지되도록 한 이차전지의 활물질 슬러리 제조방법을 제공한다.In order to solve the problems of the prior art described above, the present invention is to change the mixing process in such a way that the mixing of the conductive agent and the active material is well, the secondary battery of the secondary particles is prevented from occurring It provides a method for producing an active material slurry.
이를 위하여, 본 발명의 활물질 슬러리는 용기에 유기 용매와 도전제를 함께 투입하고 적어도 30분 동안 교반하여 상기 도전제의 표면에 유기 용매가 고르게 분포되게 하고, 이렇게 교반된 혼합물에 활물질을 투입하고 적어도 30분 동안 교반하여 상기 활물질의 표면에 도전제가 코팅되게 하는 방법에 의해 얻어짐을 특징으로 한다.To this end, in the active material slurry of the present invention, an organic solvent and a conductive agent are added together to a container and stirred for at least 30 minutes so that the organic solvent is evenly distributed on the surface of the conductive agent. It is characterized in that obtained by the method of stirring for 30 minutes to the conductive material is coated on the surface of the active material.
여기서, 상기 유기 용매는 도전제와 먼저 혼합되므로 그 도전제의 표면에 고르게 분산되어, 그 후 투입되는 활물질과 도전제의 혼합이 잘 이루어지도록 하는 것이다. 따라서, 본 발명에 의하면 도전제와 활물질의 엉김에 의해 발생되는 2차 입자의 발생을 실제적으로 방지할 수 있다.Since the organic solvent is first mixed with the conductive agent, the organic solvent is uniformly dispersed on the surface of the conductive agent, so that the active material and the conductive agent introduced thereafter are well mixed. Therefore, according to this invention, generation | occurrence | production of the secondary particle generate | occur | produced by the entanglement of a electrically conductive agent and an active material can be prevented practically.
이하, 본 발명의 바람직한 실시예를 보다 상세하게 설명한다.Hereinafter, preferred embodiments of the present invention will be described in more detail.
본 발명에서는 이차전지의 일 예로서 리튬이온전지에 사용되는 정극에 관하여 설명하기로 한다.In the present invention, a positive electrode used in a lithium ion battery as an example of a secondary battery will be described.
리튬이온전지에 사용되는 정극은 활물질로 리튬-천이금속산화물이 사용되고,도전제로 카본이 사용되며, 바인더로 PVDF 및 유기 용매로 NMP가 사용되어 혼합됨으로써 슬러리로 제조되는 것이다.The positive electrode used in the lithium ion battery is a lithium-transition metal oxide is used as an active material, carbon is used as a conductive material, PVDF is used as a binder and NMP is used as an organic solvent and mixed to prepare a slurry.
이와 같은 슬러리 제조 공정에서 상기 활물질과 도전제의 혼합이 잘 이루어지도록 하고, 상기 활물질의 표면에 도전제가 코팅되게 하여 도전 네트워크를 형성하는 방안으로, 본 발명은 먼저 도전제의 표면에 유기 용매가 고르게 분포되게 하여, 그 유기 용매가 활물질 확산에 기여토록 한 것이다.In such a slurry manufacturing process, the active material and the conductive agent are mixed well, and the conductive agent is coated on the surface of the active material to form a conductive network. The organic solvent contributes to the diffusion of the active material.
보다 구체적인 것으로, 본 발명에 의한 정극 활물질 슬러리의 제조 방법은 용기에 유기 용매와 도전제를 함께 투입하고 적어도 30분 동안 교반하여 상기 도전제의 표면에 유기 용매가 고르게 분포되도록 한 다음에, 상기와 같이 교반된 혼합물에 다시 활물질을 투입하고 적어도 30분 동안 교반하여 상기 활물질의 표면에 도전제의 확산 및 코팅이 이루어지게 하는 것이다.More specifically, in the method for preparing a positive electrode active material slurry according to the present invention, an organic solvent and a conductive agent are added together to a container and stirred for at least 30 minutes to evenly distribute the organic solvent on the surface of the conductive agent. The active material is added again to the stirred mixture and stirred for at least 30 minutes to allow diffusion and coating of the conductive agent on the surface of the active material.
이렇게 제조된 정극 활물질 슬러리는 진공 분위기에서 기포가 제거되고, 알루미늄 호일로 된 기재에 코팅된 후, 건조 및 압연됨으로써 극판으로 제조되어 진다.The positive electrode active material slurry thus prepared is made into an electrode plate by removing bubbles in a vacuum atmosphere, coated on a substrate made of aluminum foil, and then drying and rolling.
이상에서 설명된 방법에 의해 제조된 본 발명의 정극은 종래와 달리 2차 입자의 발생률이 10∼15％까지 감소됨을 알 수 있었다. 이것은 본 출원인에 의한 다수의 실험으로써 얻어진 결과이며, 그 작용은 도전제와 먼저 혼합된 유기 용매가 활물질과 도전제의 혼합에 기여하므로, 2차 입자의 발생을 억제하는 것으로 나타나게 된다.The positive electrode of the present invention prepared by the method described above was found to reduce the incidence of secondary particles by 10 to 15%, unlike the prior art. This is a result obtained by a number of experiments by the applicant, and its action appears to suppress the generation of secondary particles since the organic solvent first mixed with the conductive agent contributes to the mixing of the active material and the conductive agent.
이상에서 설명된 구성 및 작용을 통하여 알 수 있는 바와 같이, 본 발명에 의한 이차전지의 활물질 슬러리 제조방법은 극판의 2차 입자의 발생을 억제하는 효과를 갖는 것이다.As can be seen through the configuration and operation described above, the active material slurry production method of the secondary battery according to the present invention has an effect of suppressing the generation of secondary particles of the electrode plate.
즉, 본 발명은 도전제와 먼저 혼합된 유기 용매가 활물질과 도전제의 확산에 기여하도록 제조 과정을 변경함으로써, 종래 기술에서 문제시 되었던 도전제와 활물질의 엉김에 의해 발생되는 2차 입자 발생을 방지할 수 있다.That is, the present invention changes the manufacturing process so that the organic solvent mixed with the conductive agent first contributes to the diffusion of the active material and the conductive agent, thereby preventing the generation of secondary particles caused by the entanglement of the conductive agent and the active material, which has been a problem in the prior art. You can prevent it.
또한, 본 발명에 의하면 활물질과 도전제의 교반이 잘 이루어지므로 제조 공정에 소요되는 작업 시간도 아울러 절감되는 효과를 얻을 수 있다.In addition, according to the present invention, since the stirring of the active material and the conductive agent is performed well, the working time required for the manufacturing process may also be reduced.
한편, 본 발명은 상술한 특정의 바람직한 발명에 한정되지 아니하며, 특허 청구의 범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능할 것이다.On the other hand, the present invention is not limited to the above-described specific preferred invention, any person having ordinary skill in the art to which the invention belongs without departing from the gist of the invention claimed in the claims. It will be possible.
Claims (3)
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| KR1019980016433A KR100274888B1 (en) | 1998-05-08 | 1998-05-08 | Method for producing slurry of active material for secondary battery |
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| KR1019980016433A KR100274888B1 (en) | 1998-05-08 | 1998-05-08 | Method for producing slurry of active material for secondary battery |
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| KR19990084563A true KR19990084563A (en) | 1999-12-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101345559B1 (en) * | 2011-12-21 | 2014-01-02 | 한국기초과학지원연구원 | Recovery method of lithium using electrochemistry process |
| WO2014046432A1 (en) * | 2012-09-24 | 2014-03-27 | 한국기초과학지원연구원 | Method of recovering lithium from bittern using electrochemical method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160139240A (en) * | 2015-05-27 | 2016-12-07 | 주식회사 엘지화학 | Electrode mixture, preparation method thereof and secondary battery comprising the same |
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1998
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101345559B1 (en) * | 2011-12-21 | 2014-01-02 | 한국기초과학지원연구원 | Recovery method of lithium using electrochemistry process |
| WO2014046432A1 (en) * | 2012-09-24 | 2014-03-27 | 한국기초과학지원연구원 | Method of recovering lithium from bittern using electrochemical method |
| KR101536054B1 (en) * | 2012-09-24 | 2015-07-13 | 이상로 | Method of recovering lithium from bittern by using electrochemisty process |
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| Publication number | Publication date |
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| KR100274888B1 (en) | 2001-02-01 |
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