由于其成本效益,丰富的资源,和合适的工作潜力,钠离子电池有望成为电网储能领域的领先技术。然而,钠离子电池仍然面临挑战,包括与低能量密度和受限循环性能相关的问题。在这项研究中,提出了一种由普鲁士白/KetjenBlack/MXene(TK-PW)组成的自支撑电极。在TK-PW电极中,MXene层涂覆有普鲁士白色纳米颗粒和具有高电导率的KetjenBlack,有利于Na+快速动态,有效缓解电极膨胀。值得注意的是,电极制备方法简单,经济高效,实现大规模生产。电化学测试表明,TK-PW电极在200次循环后保留了74.9%的容量,1000mA·g-1时放电容量为69.7mAh·g-1。此外,建造了一个完整的细胞,采用硬碳阳极和TK-PW阴极来验证TK-PW电极的实际应用潜力。
Due to their cost-effectiveness, abundant resources, and suitable working potential, sodium-ion batteries are anticipated to establish themselves as a leading technology in the realm of grid energy storage. However, sodium-ion batteries still encounter challenges, including issues related to low energy density and constrained cycling performance. In this study, a self-supported electrode composed of Prussian white/KetjenBlack/MXene (TK-PW) is proposed. In the TK-PW electrode, the MXene layer is coated with Prussian white nanoparticles and KetjenBlack with high conductivity, which is conducive to rapid Na+ dynamics and effectively alleviates the expansion of the electrode. Notably, the electrode preparation method is uncomplicated and economically efficient, enabling large-scale production. Electrochemical testing demonstrates that the TK-PW electrode retains 74.9% of capacity after 200 cycles, with a discharge capacity of 69.7 mAh·g-1 at 1000 mA·g-1. Furthermore, a full cell is constructed, employing a hard carbon anode and TK-PW cathode to validate the practical application potential of the TK-PW electrode.