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  • 09월 20일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제126회 대한화학회 학술발표회 및 총회 Synthesis and application of CNFs/GQD/SiNPs and CNT/GQD/SiNPs composites as anodes for Lithium-ion batteries

2020년 9월 2일 16시 50분 57초
ANAL2.O-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
화 10시 : 12분
Analytical Chemistry - Oral Presentation of Young Analytical Chemists II
저자 및
Sera Kwon, Jin-Yeong Choi, Jong-Ha Choi1, Chang-Seop Lee*
Department of Chemistry, Keimyung University, Korea
1Department of Applied Chemistry, Andong National University, Korea
We used graphene quantum dots instead of graphite, which is one of the most popular anode material for existing lithium ion batteries. Silicon nanoparticles (SiNPs) and carbon nanomaterials are introduced to synthesize carbon nanofibers/graphene quantum dots/silicon nanoparticles (CNFs/GQD/SiNPs) and carbon nanotubes/graphene quantum dots/silicon nanoparticles (CNT/GQD/SiNPs) composites to improve their low capacity of carbon materials. To fabricate these composites, we positively charged SiNPs by adding poly(diallyldimethylammonium chloride)(PDDA). Subsequently, we combined the positively charged SiNPs with OH-GQDs using electrostatic attraction followed by mixing and dispersing the GQD/SiNPs nanocomposites with CNFs and CNT, respectively. After stirring, we filtered and dried the composites in the oven. The composites are reduced through annealing under Ar/H2 gases. The finally produced material is assembled into a coin cell to test battery performance which undergoes CV, rate capability, cycling test, and EIS. Before blending carbon nanomaterials, the discharge capacity of GQD/SiNPs composites is approximately 811.8mAh/g after 100 cycles. In addition, the prepared materials are characterized to investigate their physical properties via SEM/EDS, TEM, XRD, XPS, Raman, and FT-IR. We expect that these composites not only increase charging capacity, but also enhance the overall performance of the batteries by complementing each components’ shortcomings.