NbSe2 meets C2N

The shuttle effect and sluggish conversion kinetics of lithium polysulfides (LiPS) hamper the practical application of lithium-sulfur batteries (LSBs). Toward overcoming these limitations, herein an in situ grown CN@NbSe heterostructure is presented with remarkable specific surface area, as a Li-S c...

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Detalhes bibliográficos
Autores: Yang, Dawei|||0000-0002-3842-8286, Liang, Zhifu, Zhang, Chaoqi|||0000-0002-0357-235X, Jacas Biendicho, Jordi|||0000-0001-5981-6168, Botifoll, Marc|||0000-0002-4876-6393, Spadaro, Maria Chiara|||0000-0002-6540-0377, Chen, Qiulin, Li, Mengyao|||0000-0002-9082-7938, Ramon, Alberto, Moghaddam, Ahmad Ostovari, Llorca, Jordi|||0000-0002-7447-9582, Wang, Jiaao|||0000-0002-4944-4951, Morante, Joan Ramon|||0000-0002-4981-4633, Arbiol i Cobos, Jordi|||0000-0002-0695-1726, Chou, Shulei|||0000-0003-1155-6082, Cabot i Codina, Andreu|||0000-0002-7533-3251
Formato: artículo
Fecha de publicación:2021
País:España
Recursos:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:271951
Acesso em linha:https://ddd.uab.cat/record/271951
https://dx.doi.org/urn:doi:10.1002/aenm.202101250
Access Level:acceso abierto
Palavra-chave:C2N
Heterostructures
Lithium polysulfides
Lithium-sulfur batteries
Niobium selenides
Descrição
Resumo:The shuttle effect and sluggish conversion kinetics of lithium polysulfides (LiPS) hamper the practical application of lithium-sulfur batteries (LSBs). Toward overcoming these limitations, herein an in situ grown CN@NbSe heterostructure is presented with remarkable specific surface area, as a Li-S catalyst and LiPS absorber. Density functional theory (DFT) calculations and experimental results comprehensively demonstrate that CN@NbSe is characterized by a suitable electronic structure and charge rearrangement that strongly accelerates the LiPS electrocatalytic conversion. In addition, heterostructured CN@NbSe strongly interacts with LiPS species, confining them at the cathode. As a result, LSBs cathodes based on CN@NbSe/S exhibit a high initial capacity of 1545 mAh g at 0.1 C. Even more excitingly, CN@NbSe/S cathodes are characterized by impressive cycling stability with only 0.012% capacity decay per cycle after 2000 cycles at 3 C. Even at a sulfur loading of 5.6 mg cm, a high areal capacity of 5.65 mAh cm is delivered. These results demonstrate that CN@NbSe heterostructures can act as multifunctional polysulfide mediators to chemically adsorb LiPS, accelerate Li-ion diffusion, chemically catalyze LiPS conversion, and lower the energy barrier for LiS precipitation/decomposition, realizing the "adsorption-diffusion-conversion" of polysulfides.

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