Carbon-Coated Na3V2(PO4)3Anchored on Freestanding Graphite Foam for High-Performance Sodium-Ion Cathodes.
Na3V2(PO4)3(NVP) has been considered as a most promising cathode material for sodium-ion batteries (SIBs), but NVP usually exhibits poor cycling stability and rate performance due to the low intrinsic electrical conductivity. Herein, we prepared carbon-coated Na3V2(PO4)3anchored on freestanding graphite foam (denoted as NVP@C-GF) as a cathode for SIBs. The NVP@C-GF exhibits superior sodium-ion storage performance, including rate capability (56 mAh g-1at 200 C) and long cycle life (54 mAh g-1at 100 C after 20 000 cycles). The resulting NVP@C-GF inherits the advantages of 3D free-standing graphite that possesses high electrical conductivity and porous structure for the electrolyte to soak in. Furthermore, carbon-coated NVP particles anchored on the surface of GF not only accommodate the volume change of NVP during charge/discharge but also reduce the diffusion distance of the Na+ion.
Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences (CAS), Department of Materials Science and Engineering, University of Science and Technology of China , Hefei, Anhui 230026, China.
Xiongwu
X
Zhong
Beijing Laboratory for Electron Microscopy, Institute of Physics, Chinese Academy of Sciences (CAS) , Beijing, 100190, China.
Zhenzhong
Z
Yang
Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences (CAS), Department of Materials Science and Engineering, University of Science and Technology of China , Hefei, Anhui 230026, China.
Yu
Y
Jiang
Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences (CAS), Department of Materials Science and Engineering, University of Science and Technology of China , Hefei, Anhui 230026, China.
Weihan
W
Li
Beijing Laboratory for Electron Microscopy, Institute of Physics, Chinese Academy of Sciences (CAS) , Beijing, 100190, China.|Collaborative Innovation Center of Quantum Matter , Beijing 100190, China.
Lin
L
Gu
Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences (CAS), Department of Materials Science and Engineering, University of Science and Technology of China , Hefei, Anhui 230026, China.|Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University , Tianjin 300071, China.|State Key Laboratory of Fire Science, University of Science and Technology of China , Hefei, Anhui 230026, China.
Yan
Y
Yu
Na3V2(PO4)3; cathode; freestanding electrode; graphite foam; sodium-ion battery