State Key Laboratory of Organic-Inorganic Composites, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing100029, China.
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan250353, China.
ACS Appl Mater Interfaces. 2023 Feb 15;15(6):7999-8009. doi: 10.1021/acsami.2c19681. Epub 2023 Jan 31.
CoO is a potential high-capacity anode material for lithium-ion batteries (LIBs) and potassium-ion batteries (PIBs), but the poor electrical conductivity and large volume fluctuations during long-term cycling severely limit its cycle durability and rate capabilities, especially for PIBs with large K-ion size. Here, we propose a sulfur template route to fabricate an integral 3D porous CoO/MXene (TiCT) foam using simple vacuum co-filtrating an aqueous dispersion of CoO, S and MXene followed by calcining to remove the S template. The 3D porous structure can easily accommodate the large volume changes of CoO while maintains electrode structural integrity, allowing to realize outstanding long-term cycle stability when tested as anodes for both LIBs (620.4 mA h g after 1000 cycles at 1 A g) and PIBs (134.1 mA h g after 1000 cycles at 0.5 A g). The high metallic conductivity of the 3D porous MXene network further facilitates the electron/ion transmission, resulting in an improved rate capability of 390 mA h g at 13 A g for LIBs and 125.3 mA h g at 1 A g for PIBs. The robust performance of the 3D porous CoO/MXene foam reflects its perspective as a high-performance anode material for both LIBs and PIBs.
CoO 是一种有潜力的锂离子电池 (LIBs) 和钾离子电池 (PIBs) 的高容量阳极材料，但在长期循环过程中较差的导电性和大体积变化严重限制了其循环耐久性和倍率性能，尤其是对于具有较大 K 离子尺寸的 PIBs 而言。在这里，我们提出了一种使用硫模板的路线，通过简单的真空共过滤 CoO、S 和 MXene 的水性分散体，然后煅烧去除 S 模板，来制备整体 3D 多孔 CoO/MXene (TiCT) 泡沫。3D 多孔结构可以轻松容纳 CoO 的大体积变化，同时保持电极结构的完整性，当用作 LIBs（在 1 A g 下 1000 次循环后为 620.4 mA h g）和 PIBs（在 0.5 A g 下 1000 次循环后为 134.1 mA h g）的阳极时，实现了出色的长期循环稳定性。3D 多孔 MXene 网络的高导电性进一步促进了电子/离子的传输，从而提高了 LIBs 的倍率性能，在 13 A g 下为 390 mA h g，在 1 A g 下为 PIBs 的 125.3 mA h g。3D 多孔 CoO/MXene 泡沫的稳健性能反映了其作为 LIBs 和 PIBs 高性能阳极材料的前景。
