An advanced blackberry-shaped Na3V2(PO4)(3) cathode: Assists in high-rate performance and long-life stability

作者：Zhang, Jianwen; Liu, Weifang; Hu, Hang; Li, Xiaoqing; Huang, Yanping; Chen, Tao; Zhuo, Yi; Liu, Kaiyu^*

来源：Electrochimica Acta, 2018, 292: 736-741.

DOI：10.1016/j.electacta.2018.10.007

• Sodium-ion batteries
• Cathode
• Na3V2(PO4)(3)
• Blackberry-shaped structure

Na3V2(PO4)(3) is suitable for the rapid migration of Na+ in the electrochemical reaction process due to its open-ended structure of 3D sodium super ionic conductor type, but the low electronic conductivity and large volume deformation during the repeated Na+ extraction/insertion severely limit its rate and cycle performance. Herein, a blackberry-shaped Na3V2(PO4)(3) is synthesized for the first time to address both of the problems, and the structure is composed of aggregated carbon-coated nanoparticles attaching to highly conductive 3D porous carbon scaffolds, hence provides efficient pathways for both electrons and ions. For sodium-ion batteries, the blackberry-shaped Na3V2(PO4)(3) exhibits high reversible capacity (116 mA h g(-1) at 0.2 C), high-rate performance (83 mA h g(-1) at 20 C) and long-life stability (94.4% capacity retention after 4500 cycles at 10 C). The excellent electrochemical performance indicates that blackberry-shaped Na3V2(PO4)(3) has better application prospects as an advanced cathode material for sodium-ion batteries.

• 出版日期2018-12-1
• 单位中南大学