Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Development of Bismuth Alloy-Based Anode Material for Lithium-Ion Battery

리튬이온 전지용 Bismuth 합금 기반 음극재 개발

  • Chi Rong Sun (Department of Mechanical Engineering, Sung Kyun Kwang University) ;
  • Jae Hoon Kim (Department of Mechanical Engineering, Sung Kyun Kwang University)
  • 손계영 (성균관대학교 기계공학과) ;
  • 김재훈 (성균관대학교 기계공학과)
  • Received : 2024.02.29
  • Accepted : 2024.03.10
  • Published : 2024.03.31
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Abstract

Bismuth is a promising anodic for Li-ion batteries (LIBs) due to its adequate operating voltage and high-volume capacity (3,765 mAh cm-3). Nevertheless, inevitable volume expansion during Bi alloy reactions leads to severe capacity loss and cell destruction. To address this, a complex of bismuth alloy nanoparticles (Bi@NC) embedded in an N doping-carbon coating is fabricated via a simple pyrolysis method. Nano-sized bismuth alloys can improve the reaction dynamics through a shortened Li+-ion diffusion path. In addition, the N-doped carbon coating effectively buffers the volume change of bismuth during the extended alloy/dealloy reaction with Li+ ions and maintains an effective conductive network. Based on the Thermogravimetric analysis (TGA) showed high bismuth alloy loading (80.9 wt%) and maintained a high gravimetric capacity of 315 mAh g-1 up to 100 cycles with high volumetric capacity of 845.6 mAh cm-3.

Bismuth는 적절한 작동 전압(0.8 V)과 높은 체적 용량(3,765 mAh cm-3) 때문에 Li-ion battery (LIBs)의 유망한 음극소재로 여겨진다. 그럼에도 불구하고 Bi의 Li과의 합금화 반응 중 필연적인 부피 팽창은 심각한 용량 손실과 셀 파괴를 초래한다. 이를 해결하기 위해 본 논문에서는 N이 도핑된 탄소에 내장된 비스무트 합금 나노 입자(Bi@NC)의 복합체를 간단한 열분해 방법을 통해 제조하였다. 나노 크기의 Bismuth 합금은 단축된 Li+ 이온 확산 경로를 통해 반응 동역학을 향상시킬 수 있다. 또한, N 도핑된 탄소 코팅은 Li+ 이온과의 확장된 합금/탈 합금 반응 동안 Bismuth의 부피 변화를 효과적으로 완충하고 효과적인 전도성 네트워크를 유지한다. 열 중량 분석한 결과 매우 높은 Bismuth 합금 로딩(80.9 wt%)을 보여줬음에도 불구하고 100 cycles까지 315 mAh g-1 용량을 유지하였다.

Keywords

References

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