Zhongchao Bai, Kai Fan, Meiqing Guo, Mingyue Wang, Ting Yang, Nana Wang
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引用次数: 0
摘要
锂硫(Li-S)电池是下一代大规模能源存储最有吸引力的候选电池,因为其理论能量密度高,而且硫的价格低廉。然而,大多数报道的研究主要集中在使用粘合剂和传统集电体的低硫负载(低于 2 mgs cm-2)阴极上,从而影响了预期的能量密度。在此,我们设计了一种由 N、O 共掺杂碳纳米管(N,O-CNT)装饰的木质框架(WF),称为 WF-CNT,作为独立的硫宿主,实现了 10 mgs cm-2 的高硫负荷。这种独特的阴极具有低曲度微通道和导电框架,从而减少了离子和电子的扩散路径,并适应了与硫有关的体积变化。此外,内部的碳纳米管林能有效捕获可溶性多硫化锂(LiPSs),并催化其氧化还原动力学。因此,在 0.5 A g-1 的高电流密度下,S@WF-CNT-800 样品显示出 1438.2 mAh g-1 的高初始放电容量。此外,在 0.5 A g-1 条件下,硫含量为 5 mgs cm-2 时,经过 500 次循环后,可获得 404.5 mAh g-1 的可逆容量。这项研究有助于利用具有成本效益和可持续发展的生物质材料开发用于锂-S 电池的高硫负荷阴极。
Rational Design of a Cost-Effective Biomass Carbon Framework for High-Performance Lithium Sulfur Batteries
Lithium–sulfur (Li-S) batteries are the most attractive candidates for next-generation large-scale energy storage because of their high theoretical energy density and the affordability of sulfur. However, most of the reported research primarily concentrates on low sulfur loading (below 2 mgs cm−2) cathodes using binders and traditional collectors, thus undermining the expected energy density. Herein, a N, O co-doped carbon nanotube (N, O-CNT) decorated wood framework (WF), denoted as WF-CNT, was designed as a free-standing sulfur host, achieving high sulfur loading of 10 mgs cm−2. This unique cathode featured low tortuosity microchannels and a conductive framework, reducing the diffusion paths for both ions and electrons and accommodating the volume changes associated with sulfur. Moreover, the internal CNT forests effectively captured soluble lithium polysulfides (LiPSs) and catalyze their redox kinetic. Consequently, the S@WF-CNT-800 sample exhibited a high initial discharge capacity of 1438.2 mAh g−1 at a high current density of 0.5 A g−1. Furthermore, a reversible capacity of 404.5 mAh g−1 was obtained after 500 cycles with sulfur loading of 5 mgs cm−2 at 0.5 A g−1. This work may support the development of high sulfur loading cathodes utilizing cost-effective and sustainable biomass materials for Li-S batteries.