将部分氧化的 V2C 纳米片和碳纳米管散布到高性能锂硫电池的多功能多硫化物屏障中,ACS Applied Materials & Interfaces

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将部分氧化的 V2C 纳米片和碳纳米管散布到高性能锂硫电池的多功能多硫化物屏障中
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-11-16 , DOI: 10.1021/acsami.1c16191
Tong Wang ₁ , Yanyu Liu ₁ , Xiaomin Zhang ₂ , Jiayi Wang ₂ , Yongguang Zhang _{1,

2} , Yebao Li ₂ , Yaojie Zhu ₂ , Gaoran Li ₃ , Xin Wang ₂

Affiliation

锂硫（Li-S）电池因其高理论能量密度而备受关注，而多硫化锂（LiPS）的寄生穿梭行为阻碍了该技术产生实际竞争性能。针对这一关键挑战，我们通过用 CNT 散布的 V ₂ C/V ₂ O ₅纳米片改进传统隔板来减轻穿梭效应，从而开发了一种先进的多硫化物屏障。V ₂ C MXene的部分氧化构建了 V ₂ C/V ₂ O ₅复合材料，其中 V ₂ O ₅纳米颗粒均匀分散在几层V _{2 上}C纳米片，协同并同时改善硫限制和氧化还原反应动力学。此外，1D CNTs 和2D V ₂ C/V ₂ O ₅之间的相互堆叠不仅防止了纳米片的团聚以有效暴露活性界面，而且还构建了用于快速电荷和质量转移的稳健导电网络。具有 V ₂ C/V ₂ O ₅ /CNTs 改性隔膜的 Li-S 电池实现了高初始容量（0.2 C时为1240.4 mAh g ^–1）、良好的容量保持率（500 次循环为 82.6%）和良好的面积容量(5.9 mAh cm ^–2 ) 在增加的硫负载 (6.0 mg cm ^–2）。这项工作为耐用且高效的硫电化学提供了独特的多功能隔板设计，有望改善 Li-S 电池的电化学性能。

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Interspersing Partially Oxidized V2C Nanosheets and Carbon Nanotubes toward Multifunctional Polysulfide Barriers for High-Performance Lithium-Sulfur Batteries

Lithium–sulfur (Li–S) batteries have attracted much attention attributed to their high theoretical energy density, whereas the parasitic shuttling behavior of lithium polysulfides (LiPS) hinders this technology from yielding practically competitive performance. Targeting this critical challenge, we develop an advanced polysulfide barrier by modifying the conventional separator with CNTs-interspersed V₂C/V₂O₅ nanosheets to alleviate the shuttle effect. The partial oxidization of V₂C MXene constructs the V₂C/V₂O₅ composite with V₂O₅ nanoparticles uniformly dispersed on few-layered V₂C nanosheets, which synergistically and concurrently improves the sulfur confinement and redox reaction kinetics. Moreover, the interstacking between the 1D CNTs and the 2D V₂C/V₂O₅ not only prevents the agglomeration of nanosheets for efficient exposure of active interfaces but also constructs a robust conductive network for fast charge and mass transfers. The Li–S cells with V₂C/V₂O₅/CNTs-modified separator realize a high initial capacity (1240.4 mAh g^–1 at 0.2 C), decent capacity retention (82.6% over 500 cycles), and favorable areal capacity (5.9 mAh cm^–2) at a raised sulfur loading (6.0 mg cm^–2). This work affords a unique multifunctional separator design toward durable and efficient sulfur electrochemistry, holding great promise for improving the electrochemical properties of Li–S batteries.

更新日期：2021-12-01

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