Wide-temperature-range stable energy storage ceramic capacitor dielectric material and preparation method thereof

By introducing strontium titanate and orthogonalized iron tantalate calcium perovskite solid solution phases into the sodium bismuth titanate matrix phase, a ferroelastic-ferroelectric hybrid domain structure was constructed, which solved the performance instability problem of sodium bismuth titanate-based energy storage ceramics in a wide temperature range and achieved stable energy storage performance with high energy density and low loss.

CN121885401APending Publication Date: 2026-04-17CENT SOUTH UNIV
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Patent Information

Application Number
CN202610136831.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-30
Publication Date
2026-04-17

AI Technical Summary

Technical Problem

The performance of sodium bismuth titanate-based energy storage ceramic capacitors is unstable over a wide temperature range, exhibiting abnormal dielectric peaks and high dielectric losses, which affects their application in the energy storage field.

Method used

Strontium titanate was introduced into the sodium bismuth titanate matrix to form a tetragonal sodium bismuth titanate-strontium titanate matrix. By doping the orthogonal calcium perovskite solid solution phase, a ferroelastic-ferroelectric hybrid domain structure was constructed to suppress dielectric anomalous peaks and improve temperature stability.

Benefits of technology

Maintaining high dielectric constant and low dielectric loss over a wide temperature range, it achieves high energy density and stable energy storage performance. The dielectric constant changes by less than 15% in the range of -150℃ to 400℃, and the dielectric loss is less than 0.02. The energy storage density and efficiency are significantly improved under high electric fields.

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Abstract

The invention discloses a wide-temperature-range stable energy storage ceramic capacitor dielectric material and a preparation method thereof. The material comprises a tetragonal sodium bismuth titanate-strontium titanate matrix phase and an orthorhombic calcium iron tantalate solid solution phase, the molar ratio of the matrix phase to the solid solution phase is 1: a, and a is greater than 0 and less than or equal to 0.33. The preparation method of the material comprises the following steps: weighing the raw materials according to the stoichiometric ratio, and carrying out primary ball milling, pre-sintering, secondary ball milling, granulation, blank making and sintering to obtain the material. According to the dielectric material, A-site and B-site multi-element co-doping is carried out in a perovskite structure, so that long-range ferroelectric order is destroyed into a polar nanometer micro-region; and Ca < 2 + > with small ion radius induces the oxygen octahedron to incline orderly to form a ferroelastic micro-domain structure. The ferroelastic-ferroelectric hybrid structure plays an important role in reducing hysteresis loss, improving a breakdown electric field and ensuring structural stability. The dielectric ceramic solves the technical problems that sodium bismuth titanate-based energy storage ceramic is low in energy storage density and difficult to stably work in a wide temperature range.
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