Enhanced sodium and potassium ions storage of soft carbon by a S/O co-doped strategy
Enhanced sodium and potassium ions storage of soft carbon by a S/O co-doped strategy
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通过S/O共掺杂策略增强软碳的钠和钾离子存储
DOI：
10.1016/j.electacta.2020.137526
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发表时间：
2021
影响因子：
6.6
通讯作者：
陈小华
中科院分区：
文献类型：
--
作者：
申雨萍;黄聪;李艳花;周游;徐亚利;张燕;胡爱平;唐群力;宋先印;蒋昌忠;陈小华
钠和钾离子电池（SIB和PIB）的软碳基阳极的开发受到由于较大的离子Na+/K+尺寸导致的缓慢电荷存储动力学的阻碍。已经报道了各种策略，包括孔结构调节和杂原子掺杂，以提高电池性能，但牺牲初始库仑效率。本文以3，4，9，10-二萘嵌苯四甲酸二酐（PTCDA）为前驱体，采用球磨-热处理法制备了S/O共掺杂软炭（SO-SC）。球磨过程有助于纳米颗粒的形貌由小的不规则形状转变为大的纳米颗粒聚集体，这有利于减小电解质/电极接触面积，从而提高初始库仑效率（ICE）。此外，在碳结构中引入了硫和氧的掺杂位，增大了层间距，增加了Na+或K+的配位。由于这些理想的特性，用于SIB阳极的SO-SC可提供61.3%的高ICE和优异的上级倍率性能（在2 Ag−1时为230.7 mAhg− 1）。4000次循环后的高容量保持率为86.9%。此外，当用作PIB阳极时，SO-SC还具有412.6 mAhg−1的高容量，出色的倍率性能和循环性能。
The development of soft carbon based anode for sodium and potassium ion batteries (SIBs and PIBs) is hindered by the slow charge storage dynamics due to the larger ionic Na+/K+size. Various strategies, including pore structure regulation and heteroatom doping, have been reported to enhance the batteries performance but sacrificing initial coulombic efficiency. Herein, a simple ball mill-thermal treatment method is developed to prepare S/O co-doped soft carbons (SO-SC) using 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) as precursor. The ball-milling process is helpful for the morphology change from small irregular shapes to the large nanoparticle aggregates, which is beneficial for the decrease of electrolyte/electrode contact area, thus enhancing the initial coulombic efficiency (ICE). Besides, the sulfur and oxygen doped sites are introduced into the carbon structure, which enlarge the interlayer distance and increase the Na+orK+coordinate sites. Thanks to these desirable characteristics, the SO-SC for the SIB anode delivers a high ICE of 61.3% and superior rate capability (230.7 mAhg−1at 2 Ag−1). A high capacity retention of 86.9% after 4000 cycles is also demonstrated. Furthermore, when applied as PIBs anode, the SO-SC also delivers a high capacity of 412.6 mAhg−1, remarkable rate performance and cyclic performance.
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