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首页> 外文期刊>Advanced functional materials >Self-Regulation of Spin Polarization Density Propelling the Ion Diffusion Kinetics for Flexible Potassium-Ion Batteries
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Self-Regulation of Spin Polarization Density Propelling the Ion Diffusion Kinetics for Flexible Potassium-Ion Batteries

机译：Self-Regulation of Spin Polarization Density Propelling the Ion Diffusion Kinetics for Flexible Potassium-Ion Batteries

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Potassium ion batteries (PIBs) have aroused intensive research interest owingto their abundant source, low cost, and suitable working potential. Here, aV_2C-VO_2 nanoribbon intertwined nanosheet 3D multi-heterostructure withrich heterointerface and heterojunction is fabricated via a facile solution-basedmethod for realizing a highly flexible and robust anode material of PIBs. The coexistenceof V_2C-VO_2 in the constituent individual nanoribbon and nanosheetgenerates rich heterojunctions and heterointerfaces in this hetero-dimensionaland multi-scale heterostructure, which not only constructs interconnected3D channels for rapid electron/ion transfer and diffusion, but also greatlyenhances the structural durability and mechanical robustness. With experimentalresults and systematical theoretical studies, it is confirmed that theV_2C-VO_2 multi-heterostructure can self-regulate the spin polarization density ofconstituent individual V_2C and VO_2, which propels the K~+ ion diffusion kineticsduring charge and discharge processes. Consequently, the multi-heterostructure-based electrode can maintain a capacity of ≈200 mAh g~(?1) over repeated2000 cycles at 1 A g~(?1). Practically, the flexible full cells exhibit decent electrochemicalproperty under intensive bending conditions, holding great promisefor flexible electronic devices.

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