Considering the imperious challenge of the state-of-the-art lithium ion batteries (LIBs) with the development of portable electronics, the widely commercialized LiCoO₂ cathode for LIBs cannot satisfy the emerging need for flexible devices. Acknowledgedly, self-standing LiCoO₂ cathodes immobilised on 3D substrates are still confronted with challenge. Herein, for the first time, we report an original fabrication strategy for the hexagonal layered LiCoO₂ in-situ growth on 3D Au-coated copper foam substrate (denoted as LCO@ACF), among which the ACF (confirmed by angle resolved X-ray photoelectron spectroscopy, ARXPS) serves as not only the backbone and electron pathway for charge delivery and storage, but supports the active materials. Accordingly, the lithium ions doped ZIF67 (named as Li@ZIF67) was firstly synthesized by a facile microwave-assisted route and further in-situ growth on the ACF substrate (Li@ZIF67@ACF), which acts as a self-sacrificial MOF templates, and finally annealed under the optimal condition. Ascribed to the advantages of the structure of MOF precursor and 3D substrate, the as-synthesized self-standing 3D LCO@ACF electrode possesses large specific capacity, high porosity, and boosted electrochemical conductivity. As LIBs half-cell at 25 °C, the LCO@ACF electrode delivers a distinguished cycling stability of 136.4 mA h g⁻¹ at 2 C after 600 cycles, as well as excellent rate capability of 111.7 mA h g⁻¹ at 15 C, which are further deciphered by ex-situ Raman analyses, CV measurements, and “Electron-Li⁺ shared capacitor” mechanism. To expand the material application scope, the 3D LCO@ACF materials were evaluated under harsh testing conditions by cycling at a higher temperature of 50 °C, and successfully constructed into the LCO@ACF//Graphite LIBs full cell, among which LCO@ACF exhibits superior full cell electrochemical performance as for LIBs cathode. The strategy for synthesizing 3D self-standing MOF-derived cathode provides prospects for designing promising high-performance flexible LIBs cathodes.

考虑到随着便携式电子设备的发展，最先进的锂离子电池（LIB）面临的严峻挑战，用于LIB的广泛商业化的LiCoO ₂阴极不能满足对柔性器件的新兴需求。众所周知，固定在3D基板上的自立式LiCoO ₂阴极仍然面临挑战。在此，我们首次报道了六方层状LiCoO ₂ 的原位制造策略在3D镀金的泡沫铜基底（称为LCO @ ACF）上生长，其中ACF（通过角分辨X射线光电子能谱，ARXPS确认）不仅充当电荷传输和存储的主干和电子通道，而且支持活性物质。因此，首先通过简便的微波辅助途径合成了掺杂锂离子的ZIF67（命名为Li @ ZIF67），并进一步原位合成。在作为自牺牲MOF模板的ACF基板（Li @ ZIF67 @ ACF）上生长，并最终在最佳条件下退火。合成后的自立式3D LCO @ ACF电极由于具有MOF前驱体和3D衬底的结构优势，具有大的比容量，高孔隙率和增强的电化学电导率。作为LIB在25°C时的半电池，LCO @ ACF电极经过600个循环后在2 C时可提供136.4 mA h g ^-1的出色循环稳定性，以及在15 C时111.7 mA h g ^-1的出色倍率能力，通过异位拉曼分析，CV测量和“ Electron-Li ⁺共享电容器”机制。为了扩大材料的应用范围，在苛刻的测试条件下，通过在50°C的较高温度下循环，对3D LCO @ ACF材料进行了评估，并将其成功构建为LCO @ ACF // Graphite LIBs全电池，其中LCO @ ACF与LIB阴极相比，具有优异的全电池电化学性能。合成3D自立式MOF阴极的策略为设计有前途的高性能柔性LIB阴极提供了前景。