Zn 도핑을 통한 (K,Na)NbO3-Bi(Ni,Ta)O3 세라믹의 미세구조 및 에너지 저장 물성 제어

서지정보

ㆍ발행기관 : 한국분말야금학회 ㆍ수록지정보 : 한국분말야금학회지 / 30권 / 6호
ㆍ저자명 : 김주은, 박선화, 민유호

목차

1. Introduction
2. Experimental
2.1 에너지 저장용 KNN기반 분말 제조
2.2 KNN기반 에너지 저장 소자 개발
2.3 KNN기반 에너지 저장 소재 분석 및 성능 측정
3. Results and Discussion
3.1 KNN-BNT 및 KNN-BNZT 분말 형상 및 결정구조분석
3.2 KNN-BNT 및 KNN-BNZT 세라믹 미세구조 및 결정구조 분석
3.3 KNN-BNT 및 KNN-BNZT 세라믹 에너지 저장 물성평가
4. Conclusion
Acknowledgement

영어 초록

Lead-free perovskite ceramics, which have excellent energy storage capabilities, are attracting attention owing to their high power density and rapid charge-discharge speed. Given that the energy-storage properties of perovskite ceramic capacitors are significantly improved by doping with various elements, modifying their chemical compositions is a fundamental strategy. This study investigated the effect of Zn doping on the microstructure and energy storage performance of potassium sodium niobate (KNN)-based ceramics. Two types of powders and their corresponding ceramics with compositions of (1-x)(K,Na)NbO3-xBi(Ni2/3Ta1/3)O3 (KNN-BNT) and (1-x)(K,Na)NbO3-xBi(Ni1/3Zn1/3Ta1/3) O3 (KNN-BNZT) were prepared via solid-state reactions. The results indicate that Zn doping retards grain growth, resulting in smaller grain sizes in Zn-doped KNN-BNZT than in KNN-BNT ceramics. Moreover, the Zn-doped KNNBNZT ceramics exhibited superior energy storage density and efficiency across all x values. Notably, 0.9KNN-0.1BNZT ceramics demonstrate an energy storage density and efficiency of 0.24 J/cm3 and 96%, respectively. These ceramics also exhibited excellent temperature and frequency stability. This study provides valuable insights into the design of KNNbased ceramic capacitors with enhanced energy storage capabilities through doping strategies.

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