Multifunctional SnSe-C composite modified 3D scaffolds to regulate lithium nucleation and fast transport for dendrite-free lithium metal anodes

Undesirable lithium dendrite growth limits the application of lithium metal anodes in high-energy storage batteries. Here, multifunctional SnSe-C composite modified 3D scaffolds are constructed to achieve dendrite-free lithium deposition. During the initial lithiation stage, the porous SnSe-C compos...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-10, Vol.9 (38), p.21695-2172
Main Authors: Shen, Xiaojie, Zhao, Guangyu, Yu, Xianbo, Huang, Huihuang, Wang, Ming, Zhang, Naiqing
Format: Article
Language:English
Subjects:
Anodes
Batteries
Cathodes
Dendritic structure
Electrode polarization
Energy storage
Ion currents
Ion flux
Ion transport
Ions
Life span
Lithium
Lithium ions
Nucleation
Scaffolds
Storage batteries
Synergistic effect
Three dimensional composites
Tin base alloys
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Summary:Undesirable lithium dendrite growth limits the application of lithium metal anodes in high-energy storage batteries. Here, multifunctional SnSe-C composite modified 3D scaffolds are constructed to achieve dendrite-free lithium deposition. During the initial lithiation stage, the porous SnSe-C composite converts into a Li-Sn alloy and Li 2 Se by lithium reduction. The lithiophilic Li-Sn alloy exhibits a low nucleation barrier and realizes homogeneous lithium nucleation. The reductive product Li 2 Se with a high ionic conductivity facilitates lithium ion transport, which helps realizing the homogeneous lithium ion flux and reducing concentration polarization. Benefitting from the synergistic effect of the Li-Sn alloy and Li 2 Se, the Li/SnSe-C anode exhibits an ultralong lifespan over 1100 h with a low overpotential of 18 mV. In full-cell configurations with LiFePO 4 cathodes, the Li/SnSe-C anode demonstrates enhanced rate capability and cycle stability with a high-capacity retention of 85% over 750 cycles. This work prepares multifunctional SnSe-C composite modified 3D scaffolds to regulate lithium nucleation and transport, which offers new insights and opportunities for developing dendrite-free lithium metal battery technology. The synergistic effect of the Li-Sn alloy and Li 2 Se to regulate lithium nucleation and fast transport.
ISSN:2050-7488
2050-7496
DOI:10.1039/d1ta06836a