MnS nanoparticles embedded in N,S co-doped carbon nanosheets for superior lithium ion storage
MnS nanoparticles embedded in N,S co-doped carbon nanosheets for superior lithium ion storage
复制标题
嵌入 N、S 共掺杂碳纳米片中的 MnS 纳米颗粒可实现卓越的锂离子存储
DOI：
10.1016/j.apsusc.2019.145239
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发表时间：
2020-04-01
影响因子：
6.7
通讯作者：
Yang, Hui
中科院分区：
文献类型：
--
作者：
Chen, Jiangnan;Cong, Jianwei;Yang, Hui
硫化锰由于其令人印象深刻的理论容量而被探索作为LIB的阳极。然而，在电化学循环期间发生的较差的电子/离子电导率和严重的体积膨胀通常导致差的电化学性能。在这篇报道中，一种新型的复合材料，MnS纳米颗粒集成N，S共掺杂碳纳米片（N，S-C）生长在柔性碳纤维布（MnS@N，S-C/CFC），作为LIB的阳极材料。N，S共掺杂的碳纳米片保护MnS颗粒免于聚集，从而促进纳米尺寸结构的形成，显著加速Li+扩散率并适应由体积变化引起的应力/应变。纳米片也通过CFC基底连接，以提供电子的传输路径并促进快速电子转移。此外，与MnS/CFC颗粒相比，MnS@N、S-C和CFC基质之间显著增强的整合确保了上级导电性和改善的机械稳定性。因此，MnS@N，S-C/CFC电极在0.05 A g（-1）下提供800 mAh g（-1）的优异的上级比容量以及优异的倍率性能（535 mAh g（-1）至2 A g（-1）），并提高了耐用性（在2 A g（-1）下500次循环后保持52.7%），提出了通过导电碳和杂原子掺杂的包封来提高LIB阳极的电化学性能的简单策略。
Manganese sulfide has been explored as anode for LIBs owing to its impressive theoretical capacity. However, inferior electronic/ionic conductivity and severe volume expansion occurring during the electrochemical cycle usually result in poor electrochemical performance. In this report, a novel composite, MnS nanoparticles integrating N,S co-doped carbon nanosheets (N,S-C) grown on flexible carbon fiber cloth (MnS@N,S-C/CFC), is fabricated as anode material for LIBs. The N,S co-doped carbon nanosheets protect MnS particles from aggregation so as to facilitate nanosized structure formation, significantly accelerating Li+ diffusivity and accommodating stress/strain caused by volume changes. Nanosheets are also connected by CFC substrate to provide the transmission pathway of the electrons and promote fast electron transfer. Morever, compared to the MnS/CFC particles, the remarkably boosted integration between MnS@N,S-C and CFC substrate ensures superior conductivity and improved mechanical stability. Consequently, the MnS@N,S-C/CFC electrode delivers superior specific capacity of 800 mAh g(-1) at 0.05 A g(-1) as well as excellent rate-capability (535 mAh g(-1) up to 2 A g(-1)), and improved durability (maintaining 52.7% after 500 cycles at 2 A g(-1)), presenting a simple strategy to boost the electrochemical performance of LIBs anodes by encapsulation of conductive carbon and heteroatom doping.