Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Synthesis and characterization of Li3V2(PO4)3/C composite cathode materials using direct co-precipitation method

직접 공침법을 이용한 Li3V2(PO4)3/C 복합체 양극 활물질 합성 및 특성

  • Jeong-Hwan Song (Department of Materials Science and Engineering, PaiChai University)
  • 송정환 (배재대학교 신소재공학과)
  • Received : 2023.09.22
  • Accepted : 2023.10.05
  • Published : 2023.10.31
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Abstract

Li3V2(PO4)3 and Li3V2(PO4)3/C composite with single phase monoclinic structure for the cathode materials are successfully synthesized by direct co-precipitation method using N2H4·H2O as the reducing agent and alginic acid as the carbon source, and their electrochemical properties were compared. The particles with approximately 1~2 ㎛ size and the uniform spherical-like morphology of the narrow particle size distribution were obtained. In addition, the residual carbon can also improve the electrical conductivity. The Li3V2(PO4)3/C composite has improved initial specific discharge capacity and excellent cycle characteristics to maintain capacity stably than Li3V2(PO4)3. The results indicate that the reducing agent and carbon composite can affect the good crystallinity and electrochemical performance of the cathode materials.

출발원료인 바나듐 산화물을 이용한 Li3V2(PO4)3를 제조하기 위해 N2H4·H2O를 환원제로 사용하였고 낮은 전기 전도성을 개선하기 위하여 알긴산을 탄소원으로 사용하여 직접 공침법을 통해 단사정계 Li3V2(PO4)3/C 복합체의 양극 활물질을 합성하여 전기화학 특성을 비교하였다. 구형에 가까운 형상으로 대략 1~2 ㎛의 균일한 입자 크기와 좁은 입도분포를 가지는 Li3V2(PO4)3을 얻을 수 있었다. 또한 제조한 Li3V2(PO4)3/C 복합체의 양극 활물질은 Li3V2(PO4)3 보다 초기 방전용량의 개선과 안정적으로 용량을 유지하는 사이클 특성이 우수하여 탄소 복합체 형성으로 인해 양극 활물질의 전기화학적 성능이 향상하는 것을 알 수 있었다.

Keywords

References

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