Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 12, Pages 13869-13877Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22746
Keywords
sodium-ion battery; porous microspheres; bicontinuous charge transport; high mass-loading; Na3V2(PO4)(3)
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21070500]
- DNL Cooperation Fund, CAS [DNL201914]
Ask authors/readers for more resources
As 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 orob 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available