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Electrochemical Characteristics of Setaria viridis-Based Carbon Anode Materials Prepared by Thermal Treatment for Lithium-Ion Secondary Batteries

열처리에 의해 제조된 강아지풀 기반 리튬 이온 이차전지용 탄소 음극재의 전기화학적 특성

  • Dong Ki Kim (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Chaehun Lim (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Seongjae Myeong (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Naeun Ha (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Chung Gi Min (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Young-Seak Lee (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
  • 김동기 (충남대학교 응용화학공학과) ;
  • 임채훈 (충남대학교 응용화학공학과) ;
  • 명성재 (충남대학교 응용화학공학과) ;
  • 하나은 (충남대학교 응용화학공학과) ;
  • 민충기 (충남대학교 응용화학공학과) ;
  • 이영석 (충남대학교 응용화학공학과)
  • Received : 2024.03.07
  • Accepted : 2024.03.27
  • Published : 2024.04.10

Abstract

In order to increase the utilization of biomass, an electrochemical performance was considered after manufacturing a carbon anode material (SV-C) for a Setaria viridis-based lithium ion secondary battery through a heat treatment process. When the heat treatment temperature of the Setaria viridis is as low as 750 ℃, the capacitance (1003.3 mAh/g, at 0.1 C) is high due to the negative (-) charge of oxygen present on the surface attracting lithium, along with the low crystallinity and high specific surface area (126 m2/g), but the capacity retention rate is believed to be as low as 61.0% (at 500 cycles and 1 C). In addition, it was confirmed that when the heat treatment temperature increased to 1150 ℃, the carbon layer was condensed to be excellent in arrangement, and the structural defects were reduced, resulting in a significant reduction in the specific surface area (32 m2/g) of the pores. Furthermore, when the surface defects of the anode material are reduced and the crystallinity is increased, the capacity retention rate is as high as 89.7% (at 500 cycles and 1 C), but the degree of defects is small, the active point is reduced, and the specific capacity is considered to be very low at 471.7 mAh/g. In the scope of this study, it was found that in the case of the Setaria viridis-based carbon anode material manufactured according to the heat treatment temperature, the surface oxygen content and crystallinity have higher reliability on the electrochemical properties of the anode material than the specific surface area.

바이오매스 활용을 높이기 위하여, 열처리 공정을 통해 강아지풀 기반 리튬 이온 이차 전지용 탄소음극재(SV-C)를 제조한 뒤 전기화학적 성능을 고찰하였다. 강아지풀의 열처리 온도가 750 ℃로 낮을 때 낮은 결정성과 높은 비표면적(126 m2/g)과 함께, 표면에 많이 존재하는 산소의 (-) 전하가 리튬을 끌어당김으로 인하여 비정전용량(1003.3 mAh/g, at 0.1 C)이 높지만, 용량 유지율은 61.0% (at 500 cycles and 1 C)로 낮아지는 것으로 여겨진다. 또한, 열처리온도가 1150 ℃로 증가하면 탄소층이 축합되어 배열이 우수해짐에 따라 구조 결함이 감소하여 기공이 크게 줄어 비표면적(32 m2/g)이 감소한 것으로 확인되었다. 또한, 음극재 표면결함이 감소하여 결정성이 높아지게 되면, 용량 유지율은 89.7% (at 500 cycles and 1 C)로 높지만, 결함 정도가 작아 활성점이 줄어들어 비정전용량이 471.7 mAh/g로 매우 낮은 것으로 여겨진다. 본 연구 범위에서, 열처리 온도에 따라 제조된 강아지풀 기반 탄소음극재의 경우, 비표면적에 비해 표면 산소 함량과 결정성 등이 음극재의 전기화학적 특성에 더 높은 신뢰도를 갖는 것으로 나타났다.

Keywords

Acknowledgement

본 연구는 한국 산업기술평가관리원의 탄소산업기반조성사업(고순도 가스 분리용 탄소분자체 및 시스템 제조기술 개발: 20016789)의 지원에 의하여 수행하였으며 이에 감사드립니다.

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