Multifunctional All-Inorganic Flexible Capacitor for Energy Storage and Electrocaloric Refrigeration over a Broad Temperature Range Based on PLZT 9/65/35 Thick Films

Bing-Zhong Shen; Yong Li; Xihong Hao

doi:10.1021/acsami.9b12353

Multifunctional All-Inorganic Flexible Capacitor for Energy Storage and Electrocaloric Refrigeration over a Broad Temperature Range Based on PLZT 9/65/35 Thick Films

ACS Appl Mater Interfaces. 2019 Sep 18;11(37):34117-34127. doi: 10.1021/acsami.9b12353. Epub 2019 Sep 6.

Authors

Bing-Zhong Shen^{1

2}, Yong Li¹, Xihong Hao^{1

2}

Affiliations

¹ Inner Mongolia Key Laboratory of FE-Related New Energy Materials and Devices , Inner Mongolia University of Science and Technology , Baotou 014010 , P. R. China.
² Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources , Inner Mongolia University of Science and Technology , Baotou 014010 , P. R. China.

PMID: 31449743
DOI: 10.1021/acsami.9b12353

Abstract

Multifunctional capacitors can efficiently integrate multiple functionalities into a single material to further down-scale state-of-the-art integrated circuits, which are urgently needed in new electronic devices. Here, an all-inorganic flexible capacitor based on Pb_0.91La_0.09 (Zr_0.65Ti_0.35)_0.9775O₃ (PLZT 9/65/35) relaxor ferroelectric thick film (1 μm) was successfully fabricated on LaNiO₃/F-Mica substrate for application in electrostatic energy storage and electrocaloric refrigeration simultaneously. The flexible PLZT 9/65/35 thick film presents a desirable breakdown field of 1998 kV/cm, accompanied by a superior recoverable energy density (W_rec) of 40.2 J/cm³. Meanwhile, the thick film exhibits excellent stability of energy-storage performance, including a broad operating temperature (30-180 °C), reduplicative charge-discharge cycles (1 × 10⁷ cycles), and mechanical bending cycles (2000 times). Moreover, a large reversible adiabatic temperature change (ΔT) of 18.0 °C, accompanied by an excellent electrocaloric strength (ΔT/ΔE) of 22.4 K cm/V and refrigerant capacity (RC) of 11.2 J/cm³, is obtained at 80 °C in the flexible PLZT 9/65/35 thick film under the moderate applied electric field of 850 kV/cm. All of these results shed light on a flexible PLZT 9/65/35 thick film capacitor that opens up a route to practical applications in microenergy-storage systems and on-chip thermal refrigeration of advanced electronics.

Keywords: PLZT 9/65/35 thick film; electrocaloric refrigeration; energy-storage performance; flexible; multifunctional capacitors; relaxor FE.