Details

Autor(en) / Beteiligte

• Matsuo, Hiroki
• Utsunomiya, Masashi
• Noguchi, Yuji

Titel

Utilizing ferrorestorable polarization in energy-storage ceramic capacitors

Ist Teil von

• NPG Asia materials, 2022-12, Vol.14 (1), p.80, Article 80

Ort / Verlag

Tokyo: Springer Japan

Erscheinungsjahr

2022

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• A self-powered system with a long lifetime would represent an opportunity in the development of a next-generation, standalone Internet of Things. Ceramic capacitors are promising candidates for energy storage components because of their stability and fast charge/discharge capabilities. However, even the energy density of state-of-the-art capacitors needs to be increased markedly for this application. Improving the breakdown electric field represents a potential solution, but operations at such high fields relying on unchanged dielectric permittivity sacrifice the lifetime of the capacitor to some degree. Here, we report ferrorestorable polarization engineering capable of more than doubling the effective permittivity. Our experiments and ab initio calculations demonstrate that a defect dipole composed of Cu 3+ and oxygen vacancy in a prototypical ferroelectric BaTiO 3 ceramic is coupled with spontaneous polarization. The resultant ferrorestorable polarization delivers an extraordinarily large effective relative permittivity, beyond 7000, with a high energy efficiency up to 89%. Our work paves the way to realizing efficient ceramic capacitors for self-powered applications. Our experiments and ab initio calculations demonstrate that a defect dipole ( μ def ) composed of Cu 3+ and oxygen vacancy in a ferroelectric BaTiO 3 ceramic is coupled with spontaneous polarization ( P s ). By designing an arrangement μ def , a shifted polarization ( P )-electric field ( E ) loop is obtained because of the strong interaction between μ def and P s . The resultant ferrorestorable polarization delivers an extraordinarily large effective relative permittivity, beyond 7,000, with a high recoverable energy density ( U rec ) and efficiency. This work paves the way to realizing efficient energy storage ceramic capacitors for self-powered applications.