NbN quantum dots anchored hollow carbon nanorods as efficient polysulfide immobilizer and lithium stabilizer for Li-S full batteries

IF 14 1区 化学 Q1 CHEMISTRY, APPLIED
Fei Ma , Zhuo Chen , Katam Srinivas , Ziheng Zhang , Yu Wu , Dawei Liu , Hesheng Yu , Yue Wang , Xinsheng Li , Ming-qiang Zhu , Qi Wu , Yuanfu Chen
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引用次数: 0

Abstract

The shuttle effect of lithium polysulfides (LiPSs) and uncontrollable lithium dendrite growth seriously hinder the practical application of lithium-sulfur (Li-S) batteries. To simultaneously address such issues, monodispersed NbN quantum dots anchored on nitrogen-doped hollow carbon nanorods (NbN@NHCR) are elaborately developed as efficient LiPSs immobilizer and Li stabilizer for high-performance Li-S full batteries. Density functional theory (DFT) calculations and experimental characterizations demonstrate that the sulfiphilic and lithiophilic NbN@NHCR hybrid can not only efficiently immobilize the soluble LiPSs and facilitate diffusion-conversion kinetics for alleviating the shuttling effect, but also homogenize the distribution of Li+ ions and regulate uniform Li deposition for suppressing Li-dendrite growth. As a result, the assembled Li-S full batteries (NbN@NHCR-S||NbN@NHCR-Li) deliver excellent long-term cycling stability with a low decay rate of 0.031% per cycle over 1000 cycles at high rate of 2 C. Even at a high S loading of 5.8 mg cm−2 and a low electrolyte/sulfur ratio of 5.2 µL mg−1, a large areal capacity of 6.2 mA h cm−2 can be achieved in Li-S pouch cell at 0.1 C. This study provides a new perspective via designing a dual-functional sulfiphilic and lithiophilic hybrid to address serious issues of the shuttle effect of S cathode and dendrite growth of Li anode.

Abstract Image

NbN量子点锚定空心碳纳米棒作为高效的多硫化物固定剂和锂稳定剂用于锂- s电池
多硫化物锂(LiPSs)的穿梭效应和不可控的锂枝晶生长严重阻碍了锂硫电池的实际应用。为了同时解决这些问题,锚定在氮掺杂空心碳纳米棒上的单分散NbN量子点(NbN@NHCR)被精心开发为高性能Li- s充满电池的高效lips固定化剂和Li稳定剂。密度泛函数理论(DFT)计算和实验表征表明,亲硫亲锂NbN@NHCR杂化物不仅可以有效地固定可溶性LiPSs,促进扩散转化动力学,减轻穿梭效应,而且可以均匀Li+离子的分布,调节均匀的Li沉积,抑制Li枝晶的生长。结果,组装的Li-S全电池(NbN@NHCR-S||NbN@NHCR-Li)提供了出色的长期循环稳定性,在高2c速率下,每循环1000次循环的低衰减率为0.031%,即使在5.8 mg cm - 2的高S负载和5.2 μ L mg - 1的低电解质/硫比下,在0.1℃下,锂-S袋状电池可获得6.2 mA h cm−2的大面积容量。本研究通过设计一种双功能的亲硫亲锂杂化材料,为解决S阴极的穿梭效应和锂阳极的枝晶生长等严重问题提供了新的视角。
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来源期刊
CiteScore
23.60
自引率
0.00%
发文量
2875
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