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Electrode Design for High-Performance Sodium-Ion Batteries: Coupling Nanorod-Assembled Na3V2(PO4)3@C Microspheres with a 3D Conductive Charge Transport Network
journal contribution
posted on 2020-03-16, 15:05 authored by Zhiqiang Lv, Moxiang Ling, Hongming Yi, Huamin Zhang, Qiong Zheng, Xianfeng LiAs
one of the most promising cathodes for sodium-ion batteries,
the polyanionic compounds still suffer from unsatisfactory capacity
and rate performance resulting from poor electron conductivity. Furthermore,
the charge-transfer kinetics, especially for Na+, becomes
limiting as the mass loading increases. Herein, a robust free-standing
electrode coupling optimal porous Na3V2(PO4)3@C microspheres with a bicontinuous charge transport
network is designed and prepared by a simple casting method. In the
design, the optimal porous carbon-coated microspheres, composed of
some continuous nanorods, along with interwoven carbon nanofiber networks
offer efficient electron transport and facile ion diffusion. Such
an elaborate design enables impressive electron/ion conductivity,
contributing to remarkable rate performance (116.1 mA h g–1 at 0.2 C; 96 mA h g–1 at 30 C) and outstanding
cycling stability (90% capacity retention in 500 cycles at 1 C; 80%
capacity retention in 5000 cycles at 10 C), which has surpassed other
similar Na3V2(PO4)3-based
free-standing electrodes as reported. More importantly, when mass
loading extends to 8 mg cm–2, an excellent capacity
retention of 75% at 10 C can be obtained. The research offers a new
avenue into the rational design of porous microspheres electrode with
high conductive charge transport network, indicating its superiority
in practical applications.
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conductive charge transport networkmicrosphereelectroncarbon nanofiber networks offerelectrodeconductivitycapacity3 D Conductive Charge Transport Networkretentionmass loading increasesHigh-Performance Sodium-Ion BatteriesPO 4bicontinuous charge transport networkmANa 3 V 2Nanorod-Assembled Na 3 V 2performance
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