Lin Zhiya, Tan Xueqing, Lin Yanping, Lin Jianping, Yang Wenyu, Huang Zhiqiang, Ying Shaoming, Huang Xiaohui
College of Mathematics and Physics, Ningde Normal University Ningde 352100 China.
College of Physics and Energy, Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center, Fujian Normal University Fuzhou 350117 China.
RSC Adv. 2022 Oct 5;12(44):28341-28348. doi: 10.1039/d2ra04153g. eCollection 2022 Oct 4.
Owing to the natural abundance and low-cost of sodium, sodium-ion batteries offer advantages for next-generation portable electronic devices and smart grids. However, the development of anode materials with long cycle life and high reversible capacity is still a great challenge. Herein, we report a yolk-shell structure composed of N,P co-doped carbon as the shell and CoP nanowires as the yolk (YS-CoP@NPC) for a hierarchically nanoarchitectured anode for improved sodium storage performance. Benefitting from the 1D hollow structure, the YS-CoP@NPC electrode exhibits an excellent cycling stability with a reversibly capacity of 211.5 mA h g at 2 A g after 1000 cycles for sodium storage. In-depth characterization by X-ray photoelectron spectroscopy and work function analysis revealed that the enhanced sodium storage property of YS-CoP@NPC might be attributed to the stable solid electrolyte interphase film, high electronic conductivity and better Na diffusion kinetics.
由于钠的天然丰度和低成本，钠离子电池在下一代便携式电子设备和智能电网方面具有优势。然而，开发具有长循环寿命和高可逆容量的负极材料仍然是一个巨大的挑战。在此，我们报道了一种由氮、磷共掺杂碳作为壳层和磷化钴纳米线作为内核组成的蛋黄壳结构（YS-CoP@NPC），用于具有分级纳米结构的负极，以改善钠存储性能。受益于一维中空结构，YS-CoP@NPC电极在2 A g下进行1000次钠存储循环后，表现出优异的循环稳定性，可逆容量为211.5 mA h g。通过X射线光电子能谱和功函数分析进行的深入表征表明，YS-CoP@NPC增强的钠存储性能可能归因于稳定的固体电解质界面膜、高电子导电性和更好的钠扩散动力学。
