3 years ago

NbS2 Nanosheets with M/Se (M = Fe, Co, Ni) Codopants for Li+ and Na+ Storage

NbS2 Nanosheets with M/Se (M = Fe, Co, Ni) Codopants for Li+ and Na+ Storage
Qingyu Yan, Chengfeng Du, Jianli Zhang, Zhengfei Dai, Yun Zong, Junwu Zhu, Bing Li, Wei Chen, Yun Zheng, Xin Wang
Transition metal (M = Fe, Co, Ni) and Se codoped two-dimensional uniform NbS2 (MxNb1–xS2–ySey) nanosheets were synthesized via a facile oil-phase synthetic process. The morphology of MxNb1–xS2–ySey can be adjusted by tuning the amount of metal and Se introduced into NbS2. Among them, the optimized Fe0.3Nb0.7S1.6Se0.4 nanosheets, with lateral sizes of 1–2 μm and approximately 5 nm thick, achieve the best Li-ion and Na-ion storage properties. For example, the Fe0.3Nb0.7S1.6Se0.4 nanosheets depict excellent rate capabilities with fifth-cycle specific capacities of 461.3 mAh g–1 at 10 A g–1 for Li storage and 136 mAh g–1 at 5 A g–1 for Na storage. More significantly, ultralong cyclic stabilities were achieved with reversible specific capacities of 444 mAh g–1 at 5 A g–1 during the 3000th cycle for Li storage and 250 mAh g–1 at 1 A g–1 during the 750th cycle for Na storage. Post-treatment high-resolution transmission electron microscopy was studied to prove that the reversible Li-ion storage in NbS2 was based on a conversion reaction mechanism.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b06133

DOI: 10.1021/acsnano.7b06133

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