Porous V2O3/C composite anodes with pseudocapacitive characteristics for lithium-ion capacitors
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摘要: 以NaCl为模板、结合冷冻干燥技术合成了多孔炭复合V2O3纳米材料，研究其用作锂离子电池负极材料的动力学特征，并与商业化活性炭构建锂离子电容器，测试其电化学性能。结果表明，多孔炭复合V2O3纳米材料具有赝电容行为，所构建的锂离子电容器同时具有高能量、高功率和长效循环稳定性，是一种很有前景的锂离子电容器负极材料。Abstract: Vanadium trioxide materials have attracted great interest owing to their low cost and high theoretical lithium storage capacity. In this work, porous V2O3@C composites were prepared via a NaCl template-assisted freeze-drying strategy. Benefiting from the unique three-dimensional porous carbon-based structure, the V2O3@C composite anode exhibits a high-rate pseudocapacitive behavior. A lithium-ion capacitor (LIC) based on this V2O3@C composite anode and a commercial AC cathode was constructed. Results show that the as-constructed device exhibits high energy density, high power density as well as long cycling stability, indicating the great promise of our porous V2O3@C composites for the high-performance LICs.
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Key words:
- V2O3 /
- Lithium ion capacitor /
- Hybrid device /
- 3D porous carbon
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图 1 三维炭复合 V2O3材料的电化学性能：(a) 不同扫描速率下的CV曲线，(b) 根据峰电流和扫描速率计算的b值，(c) 动力学分析，(d) 不同扫速下电容和扩散反应对容量的贡献比例
Figure 1. Electrochemical performance of the 3D porous V2O3@C anode. (a) CV curves of V2O3@C at various scanning rates. (b) Determination of the b value using the relationship between peak current and scan rate. (c) Quantification of the capacitive and diffusion charge storage in V2O3@C anode. (d) Contribution ratio of diffusion and capacitive capacities at different scan rates.
图 2 (a) 活性炭的SEM照片，(b) 活性炭氮吸附/脱附曲线和相应的孔径分布图，(c) 活性炭倍率性能，(d) 5 A g−1电流密度下的循环性能
Figure 2. (a) Typical SEM image of commercial AC. (b) Nitrogen adsorption-desorption isotherm with the corresponding pore size distribution curve (the inset picture) of the commercial AC. (c) Rate performance of commercial AC at various current densities. (b) Cycle performance of commercial AC at a current density of 5 A g−1.
图 3 V2O3@C基锂离子电容器的电化学性能：(a) 器件充电过程中正负极电势变化的示意图，(b) 不同正负极质量配比性能图，(c)不同扫描速率下的CV图，(d) 不同电流密度下的恒流充放电曲线，(e) V2O3@C基锂离子电容器和其他锂离子电容器性能对比图，(f) 1 A g−1电流密度下的循环性能
Figure 3. Electrochemical performance of AC//V2O3@C. (a) Schematic of voltage changes of AC//V2O3@C during the charge process. (b) Ragone plots of AC//V2O3@C at different mass ratios of two electrodes. (c) CV curves at various scanning rates from 2 to 20 mV s−1. (d) Charge/discharge profiles at various current densities from 0.1 to 1A g−1. (e) Ragone plots of AC//V2O3@C and other reported LICs. (f) Cycle performance at a current density of 1 A g−1.
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