(Peer-Reviewed) Perspectives and challenges for lead-free energy-storage multilayer ceramic capacitors
Peiyao Zhao 赵培尧 ¹, Ziming Cai 蔡子明 ², Longwen Wu 吴隆文 ³, Chaoqiong Zhu 朱超琼 ¹, Longtu Li 李龙土 ¹, Xiaohui Wang 王晓慧 ¹
¹ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
中国 北京 清华大学材料科学与工程研究院 新型陶瓷与精细工艺国家重点实验室
² School of Material Science and Physics, China University of Mining and Technology, Xuzhou 221116, China
中国 徐州 中国矿业大学 材料与物理学院
³ College of Electrical Engineering, Sichuan University, Chengdu 610065, China
中国 成都 四川大学 电气信息学院

The growing demand for high-power-density electric and electronic systems has encouraged the development of energy-storage capacitors with attributes such as high energy density, high capacitance density, high voltage and frequency, low weight, high-temperature operability, and environmental friendliness.

Compared with their electrolytic and film counterparts, energy-storage multilayer ceramic capacitors (MLCCs) stand out for their extremely low equivalent series resistance and equivalent series inductance, high current handling capability, and high-temperature stability. These characteristics are important for applications including fast-switching third-generation wide-bandgap semiconductors in electric vehicles, 5G base stations, clean energy generation, and smart grids. There have been numerous reports on state-of-the-art MLCC energy-storage solutions. However, lead-free capacitors generally have a low-energy density, and high-energy density capacitors frequently contain lead, which is a key issue that hinders their broad application.

In this review, we present perspectives and challenges for lead-free energy-storage MLCCs. Initially, the energy-storage mechanism and device characterization are introduced; then, dielectric ceramics for energy-storage applications with aspects of composition and structural optimization are summarized. Progress on state-of-the-art energy-storage MLCCs is discussed after elaboration of the fabrication process and structural design of the electrode. Emerging applications of energy-storage MLCCs are then discussed in terms of advanced pulsed power sources and high-density power converters from a theoretical and technological point of view. Finally, the challenges and future prospects for industrialization of lab-scale lead-free energy-storage MLCCs are discussed.
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