ae9b02508_si_001.pdf (2.59 MB)
Polymer–Inorganic Composite Protective Layer for Stable Na Metal Anodes
journal contribution
posted on 2020-02-21, 21:44 authored by Qianwen Chen, Zhen Hou, Zongzhao Sun, Yayun Pu, Yabin Jiang, Yun Zhao, Heng He, Tianxu Zhang, Limin HuangNa metal anodes have
attracted great interest because of their
low electrochemical potential, high theoretical specific capacity,
and natural abundance. However, nonuniform Na ion flux induced by
an inhomogeneous solid electrolyte interphase (SEI) usually leads
to the formation of mossy or dendritic Na, resulting in a low Coulombic
efficiency (CE) and potential safety hazards. Herein, a well-designed
artificial protective layer consisting of poly(vinylidene fluoride)
(PVDF) and Sn nanoparticles was successfully constructed on a Cu current
collector (PSN@Cu current collector) by a scalable and facile doctor
blade coating technology. The flexible PVDF matrix in the protective
layer can accommodate interface fluctuations, whereas the sodiophilic
Sn nanoparticles can provide sufficient ionic conductivity for uniform
deposition/stripping and a high mechanical modulus against potential
dendrite growth. As a result, a high average CE of 99.73% can be achieved
for 2800 h at 2 mA cm–2 with the PSN@Cu current
collector. Furthermore, the PSN@Cu current collector has a stable
cycling lifetime of 2300 h at 1 mAh cm–2, which
is more than 10 times higher than that of bare Cu current collector
(∼220 h). In addition, the unique structure and composition
of the PSN-derived SEI are carefully investigated and can explain
the much improved stability and electrochemical performance of Na
metal anodes. This approach highlights the significance of a hybrid
protective layer with synergistic properties and presents a new opportunity
for stabilizing Na metal anodes.
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Keywords
interface fluctuationsNa metal anodesdendritic NaSn nanoparticlessafety hazardsdoctor blade coating technologyelectrolyte interphasecollectorCoulombic efficiencyStable Na Metal Anodes Na metal anodeselectrochemical performance2800 hnonuniform Na ion fluxPSN-derived SEICEsodiophilic Sn nanoparticles2300 hdendrite growthcycling lifetime10 timesPVDF matrix
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