Multilayer Lead‐Free Ceramic Capacitors with Ultrahigh Energy Density and Efficiency

By Jinglei Li, Fei Li, Zhuo Xu, Shujun Zhang. Advances in Materials, 2018

655 citations recorded by the source corpus.

The utilization of antiferroelectric (AFE) materials is thought to be an effective approach to enhance the energy density of dielectric capacitors. However, the high energy dissipation and inferior reliability that are associated with the antiferroelectric–ferroelectric phase transition are the main issues that restrict the applications of antiferroelectric ceramics. Here, simultaneously achieving high energy density and efficiency in a dielectric ceramic is proposed by combining antiferroelectric and relaxor features. Based on this concept, a lead‐free dielectric (Na0.5Bi0.5)TiO3‐x(Sr0.7Bi0.2)TiO3 (NBT‐xSBT) system is investigated and the corresponding multilayer ceramic capacitors (MLCCs) are fabricated. A record‐high energy density of 9.5 J cm−3, together with a high energy efficiency of 92%, is achieved in NBT‐0.45SBT multilayer ceramic capacitors, which consist of ten dielectric layers with the single‐layer thickness of 20 µm and the internal electrode area of 6.25 mm2. Furthermore, the newly developed capacitor exhibits a wide temperature usage range of ‐60 to 120 °C, with an energy‐density variation of less than 10%, and satisfactory cycling reliability, with degradation of less than 8% over 106 cycles. These characteristics demonstrate that the NBT‐0.45SBT multilayer ceramic is a promising candidate for high‐power energy storage applications.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/4c1dd7665bcb5575f0f22b97f451a9e62ae3e0bf

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In Biomedical Engineering

1. Fei Li
2. Shujun Zhang
3. Hanxing Liu
4. H. Hao
5. Yu Huang
6. Dawei Wang
7. I. Reaney
8. Fangquan Xia

In Electrical and Electronic Engineering

1. Dejun Li
2. Fei Li
3. Shujun Zhang
4. I. Reaney

In Materials Chemistry

1. Shujun Zhang
2. Fei Li
3. Dawei Wang
4. Hanxing Liu
5. H. Hao
6. I. Reaney
7. A. Feteira
8. Yu Huang

Citations in the corpus

• (Bi0.51 Na0.47)TiO3 based lead free ceramics with high energy density and efficiency (2019, background): “From a viewpoint of practical applications, the applied electric field was determined to be approximately half of the critical electric field, namely 140 kV/cm in case of the breakdown of the ceramic samples [16].”