Kaiquan He, Junlong Feng, Xiaowei Wu, Ziqin Liu, Ye Zhang, Pu Hu, Chaoqun Shang
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引用次数: 0
摘要
可溶性多硫化锂的穿梭效应阻碍了具有高理论能量密度的锂-S 电池的实际应用。为了将活性 S 物种限制在正极区域,本研究引入了基于 TiO(PO)(TOPO)和掺杂 N 的碳纳米管(NCNT)组成的人工夹层,以阻碍多硫化锂的穿梭效应并增强活性 S 物种的反应动力学。拓扑氧化物为可溶性多硫化锂提供了充分的化学键和快速的锂迁移,而 NCNT 则确保了被吸收的多硫化锂在转化过程中的快速电子传输。由于 TOPO 和 NCNT 的协同作用,在 0.1 摄氏度条件下,相应锂-S 电池的初始放电比容量为 1483.55 mAh g,而在 1 摄氏度条件下,每循环 400 次的容量衰减为 0.14%。
The construction of interlayer based on Ti2O(PO4)2 to hinder the shuttle effect of lithium polysulfides
The soluble lithium polysulfides' shuttle effect impedes the practical application of Li–S batteries with high theoretical energy density. To confine the active S species in the cathode region, in this work, an artificial interlayer based on the composition of TiO(PO) (TOPO) and N-doped carbon nanotube (NCNT) is introduced to hinder the lithium polysulfides’ shuttle effect and enhance the reaction kinetics of active S species. The TOPO provides sufficient chemical bonding to soluble lithium polysulfides and fast Li migration, while the NCNT ensures fast electron transport to the transformation of absorbed lithium polysulfides. Thanks to the synergistic combination of TOPO and NCNT, at 0.1 C, the initial discharge specific capacity of corresponding Li–S batteries is 1483.55 mAh g, while at 1 C, a capacity decay of 0.14 % per cycle is achieved for 400 cycles.
期刊介绍:
Materials Today Chemistry is a multi-disciplinary journal dedicated to all facets of materials chemistry.
This field represents one of the fastest-growing areas of science, involving the application of chemistry-based techniques to the study of materials. It encompasses materials synthesis and behavior, as well as the intricate relationships between material structure and properties at the atomic and molecular scale. Materials Today Chemistry serves as a high-impact platform for discussing research that propels the field forward through groundbreaking discoveries and innovative techniques.