期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 23, 页码 25920-25929出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05490
关键词
sodium-ion batteries; Na3V2(PO4)(2)F-3; electrospinning; fiber-shape; long-term cycling
资金
- Guangdong Power Grid Co., Ltd. [GDKJXM20161890]
To overcome intrinsic low electronic conductance, delicately designed fiber-shape Na3V2(PO4)(2)F-3@N-doped carbon composites (NVPF@C) have been prepared for boosting Na-storage performance. This distinctive interlinked three-dimensional network structure can effectively facilitate electron/Na-ion transportation by decreasing the NVPF particle size to shorten the ionic diffusion paths and introducing a conducting N-doping carbon scaffold to improve electronic conductivity. Benefiting from the favorable structural design and fascinating reaction kinetics, the modified NVPF@C material demonstrates superior sodium-storage performance with 109.5 mAh g(-1) high reversible capacity at a moderate current of 0.1 C, excellent rate tolerance of 78.9 mAh g(-1) at a high rate of 30 C, and gratifying long-term cyclability (87.8% capacity retention after 1000 cycles at 20 C; 83.4% capacity retention after 1500 round trips at a ultrahigh rate of 50 C). The fascinating electrochemical performance remains stable when NVPF@a C was examined as the cathode material for a full cell, suggesting the fiber-shape NVPF@C as one of the most promising applicable materials for sodium-ion batteries. Moreover, the approach of the three-dimensional conductive network by electrospinning is proposed as a strategy of efficiency and promising prospect to enhance the electrochemical property of other materials for sodium-ion batteries.
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