Tunable fabric zinc-based batteries utilizing core-shell like fiber electrodes with enhanced deformation durability

초록

One-dimensional (1D) fiber-based batteries stand as a promising route for next-generation wearable devices owing to their combined energy storage capability and wearability. However the development of efficient fiber electrodes and high-quality battery configurations that retain excellent electrochemical performance and garment compatibility while withstanding variable mechanical deformations remains a pressing challenge. In this study NiCo2S4@rGO nanocomposites with stable structures and excellent electrochemical performance were constructed using an in-situ hydrothermal strategy. The highly conductive network of reduced graphene oxide (rGO) improved the electron transport efficiency of the nanocomposites while mitigating volume changes structural collapse and self-aggregation of NiCo2S4 nanoparticles during the charging/discharging cycle. As expected the nanocomposite cathodes in the Zn-based batteries exhibited remarkable discharging capacity (277.11 mAh g−1) and cycling performance (70% retention after 2000 cycles). Subsequently a composite fiber cathode (NiCo2S4@rGO-PU-CNTs) with tailorable length and core-shell like structure was fabricated via wet spinning. Benefiting from the introduced carbon nanotubes (CNTs) and polyurethane (PU) the composite fiber cathode formed efficient dual-conducting networks and stable core-shell like structures thereby improving the electron transport pathways and mechanical flexibility. Finally as a proof of concept the independent NiCo2S4@rGO-PU-CNTs cathode and independent Zn@SSY (stainless steel yarn) anode were woven into a knitted fabric creating tunable serpentine footprint fabric Zn-based batteries with exceptional electrochemical properties (175.29 mAh g−1 and 0.088 mAh cm−1) coupled with remarkable electrochemical stability and mechanical deformation durability. The engineering strategy reported herein provides a promising platform for the quick facile and continuous preparation of composite fiber cathodes and tailorable wearable energy textiles. © 2024 Elsevier Ltd

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