Confined Co-doped Dielectric Film

High energy density & stability

By co-doping BaTiO₃ and Al₂O₃ nanoparticles into a ferroelectric core and inducing self-assembly, this polymer dielectric simultaneously achieves enhanced energy density and charge-discharge efficiency with high cycling stability.

Xing-Kun, Ma · Qi-Ze, Han · Jian-Tao, Wang · Huang, Lei · Yin, Juan · Zhong, Shaolong · Lu, Jingtong · Xin-Xin, Wang · Guo, Limin · Bi, Ke · Dang, Zhimin

Nature Communications 2026

Specifications

Discharged energy density

{'zh': '19.2', 'en': '19.2'} J/cm³

Cycling number

{'zh': '1×10⁵', 'en': '1×10⁵'} cycles

Advantages

Boosts both energy density and efficiency

The confined co-doping design enables uniform dispersion and self-assembly of BaTiO₃ and Al₂O₃ nanoparticles in the ferroelectric core, which enhances permittivity while suppressing leakage current, thereby simultaneously achieving high energy density and high charge-discharge efficiency.

Stable over 100,000 cycles

After 1×10⁵ charge-discharge cycles at 400 kV/mm, the performance remains stable, indicating excellent fatigue resistance and long-term reliability.

Scalable fabrication

The coaxial electrospinning and hot-pressing process is simple and scalable, enabling large-area production of high-performance dielectric films.

Applications

• Pulse power capacitors：High power density and fast charge-discharge capability suit energy storage capacitors in pulse power supplies.
• Flexible energy storage：The polymer matrix provides flexibility for integration into wearable or flexible electronic devices.
• Dielectric film capacitors：The composite film can serve as the dielectric layer in film capacitors to enhance performance.
• Power electronics energy storage：High energy density helps reduce the volume and weight of capacitors in power electronics.
• EV pulse power：Suitable for pulse power systems in electric vehicles that require instantaneous high power.