Safe 4 Ah Energy Storage Textiles with Ultrahigh Volumetric Energy Density and Excellent Environmental Adaptability

Abstract

Abstract

Fiber-shaped zinc-ion batteries (FZIBs) are regarded as highly promising candidates for next-generation flexible wearable electronics owing to their excellent electrochemical properties, high safety and weavability. Although increasing the loading of active materials enhances the energy density of FZIBs, their effective utilization is still hindered by insufficient interfacial adhesion and wettability, an inadequate electrode conductive network, and obvious polarization, especially in meter-long devices. Herein, a fabrication strategy for 40-m-level fiber cathodes based on synergistic coupling of an elastic adhesive network structure with a three-dimensional conductive network is proposed. The produced fiber cathodes are endowed with enhanced hydrophilicity, mechanical flexibility, and interfacial adhesion. Simultaneously, efficient conductive pathways along radial and axial directions are established, resulting in a more uniform electric field and ion distribution. Benefiting from these characteristics, the FZIBs deliver a high specific capacity of 303.99 mAh g⁻¹, ultrahigh volumetric energy density of 112.61 mWh cm⁻³, and outstanding flexibility while maintaining 80.37% of the initial capacity after 100,000 bending cycles. The energy storage textile unit, woven from 8-m-long FZIBs, achieves a capacity of 1 Ah and demonstrates excellent environmental adaptability under conditions of −30 to 80 °C and negative pressure of −0.08 MPa. Moreover, a 4 Ah handbag assembled with four textile units is demonstrated to power various mobile devices, demonstrating promising potential for wearable electronics.

Graphical Abstract

By employing an elastic bonding structure and a 3D conductive network strategy, fiber-shaped batteries exhibiting excellent mechanical flexibility and electrochemical performance are fabricated and assembled into a 4 Ah handbag. The elastic bonding structure enhances the interfacial adhesion of the fiber cathode and imparts superior bending durability, while the 3D conductive network improves electron transport and uniform ion distribution.

Keywords

Fiber-shaped / Zinc-ion batteries / Energy storage textile / Long fiber / Cathode

References

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Funding

National Natural Science Foundation of China(No. 52573221)

University Scientific Research and Innovation Team Program of Sichuan(2020JDTD0035)

Fundamental Research Funds for the Central Universities(ZYGX2025XJ016)

Sichuan Province Science and Technology Support Program(2023ZYD0026)

RIGHTS & PERMISSIONS

Donghua University, Shanghai, China