Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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CuO-Coated Titanium Niobium Oxide for High-Power Lithium-Ion Batteries

고출력 리튬이온전지를 위한 CuO 코팅된 타이타늄 나이오븀 옥사이드

  • Chaewon Lee (Department of Battery and Chemical Engineering, Changwon National University) ;
  • Minju An (Department of Battery and Chemical Engineering, Changwon National University) ;
  • Hyosang An (Department of Battery and Chemical Engineering, Changwon National University) ;
  • Eunchae Kim (Department of Battery and Chemical Engineering, Changwon National University) ;
  • Yeonguk Son (Department of Battery and Chemical Engineering, Changwon National University)
  • 이채원 (국립창원대학교 이차전지화학공학전공) ;
  • 안민주 (국립창원대학교 이차전지화학공학전공) ;
  • 안효상 (국립창원대학교 이차전지화학공학전공) ;
  • 김은채 (국립창원대학교 이차전지화학공학전공) ;
  • 손영욱 (국립창원대학교 이차전지화학공학전공)
  • Received : 2024.10.27
  • Accepted : 2024.11.12
  • Published : 2024.12.10
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Abstract

The Wadsley-Roth structure of TiNb2O7 (TNO) offers a favorable framework for fast Li-ion diffusion, making it a promising candidate for high-power anode materials in lithium-ion batteries (LIBs). However, its inherently low electronic conductivity, due to a wide bandgap (2.92 eV), limits its electrochemical performance. To address this limitation, we introduced a CuO coating onto micro-sized TNO particles. The CuO coating promotes the formation of a Li2O-rich solid electrolyte interphase (SEI) layer during cycling, which not only enhances ion transport but also reduces SEI layer resistance. Additionally, Cu2+ doping improves electronic conductivity by introducing additional charge carriers. As a result, CuO-TNO maintained a high reversible capacity of 234.5 mAh/g after 100 cycles at 0.5 C and achieved a capacity retention of 94.3% at 5 C in a half-cell with an electrode density of 2.3 g/cm3.

Wadsley-Roth 상의 TiNb2O7 (TNO)은 리튬 이온 확산에 유리한 구조를 가지고 있어, 리튬이온전지(LIBs)의 고출력 음극 물질로 유망한 후보로 주목받고 있다. 그러나 넓은 밴드갭(2.92 eV)으로 인한 낮은 전자전도도는 TNO의 전기화학적 성능을 제한하는 요인이다. 이를 해결하기 위해, 본 연구에서는 마이크로 크기의 TNO에 CuO를 코팅하는 방법을 적용하였다. CuO 코팅은 충·방전 과정을 통해 Li2O 상이 풍부한 solid electrolyte interphase (SEI) 층을 형성하여 이온 수송을 촉진할 뿐만 아니라, SEI 층의 저항을 감소시킨다. 또한 Cu2+가 일부 도핑되어 추가적인 전자 전달 운반체를 제공하여 전자전도도를 향상시킨다. 그 결과, 2.3 g/cm3의 전극 밀도 조건에서 반쪽 전지의 CuO-TNO는 0.5 C로 100 사이클 진행 후 234.5 mAh/g의 높은 가역용량과, 5 C에서 94.3%의 향상된 용량 유지율을 확인하였다.

Keywords

Acknowledgement

이 논문은 2023~2024년도 창원대학교 자율연구과제 연구비 지원으로 수행된 연구결과임

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