Preparation method of N-doped graphene preparation method of Sulfur-graphene composite and anode of Lithium-Sulfur battery comprising the same

The present invention provides a manufacturing method of nitrogen-doped graphene, a manufacturing method of a sulfur-graphene composite using the same, an anode of a lithium-sulfur battery including the same, and a lithium-sulfur battery having the same. The manufacturing method of nitrogen-doped gr...

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Bibliographic Details
Main Authors YANG SEUNG BO, KIM YUN KYOUNG, KWON WON JONG, LEE KIL SUN, SOHN KWON NAM
Format Patent
LanguageEnglish
Korean
Published 05.09.2018
Subjects
BASIC ELECTRIC ELEMENTS
CHEMISTRY
COMPOUNDS THEREOF
ELECTRICITY
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Summary:The present invention provides a manufacturing method of nitrogen-doped graphene, a manufacturing method of a sulfur-graphene composite using the same, an anode of a lithium-sulfur battery including the same, and a lithium-sulfur battery having the same. The manufacturing method of nitrogen-doped graphene comprises: a first step of peeling graphite by high pressure homogenization of allowing dispersion liquid containing the graphite to pass through a micro-channel of a high pressure homogenizer (HPH) including an inlet, an outlet, and the micro-channel connecting between the inlet and the outlet and having a micrometer-sized diameter to obtain graphene flakes; a second step of filtering and drying the obtained graphene flakes, then inserting the graphene flakes with an ammonium compound into a ball mill, and performing dry ball milling in an inert atmosphere to obtain grains surrounded by the ammonium compound on the surface of the graphene flakes; and a third step of heat-treating the obtained grains to obtain graphene doped with nitrogen atoms. 그라파이트를 포함하는 분산액을 유입부와 유출부 및 상기 유입부와 상기 유출부 사이를 연결하며 마이크로미터 크기의 직경을 갖는 미세 유로를 포함하는 고압 균질기(High Pressure Homogenizer, HPH)의 미세 유로를 통과시키는 고압 균질화를 통해 그라파이트를 박리시켜 그래핀 플레이크를 얻는 제1 단계; 상기 얻어진 그래핀 플레이크를 여과 및 건조시킨 후 암모늄 화합물과 함께 볼밀에 넣고, 불활성 분위기 하에서 건식 볼 밀링을 진행하여 상기 그래핀 플레이크의 표면에 상기 암모늄 화합물이 둘러싼 상태의 입자를 얻는 제2 단계; 및 상기 얻어진 입자를 열처리하여 질소 원자가 도핑된 그래핀을 얻는 제3 단계;를 포함하는 질소 도핑된 그래핀의 제조 방법, 이를 이용한 황-그래핀 복합체의 제조 방법, 상기 황-그래핀 복합체를 포함하는 리튬 황 전지 양극, 및 상기 양극을 구비하는 리튬 황 전지가 제시된다.
Bibliography:Application Number: KR20180024875