Wang Xiaohong, Qi Li, Wang Hongyu
State Key Laboratory of Electroanalytical Chemistry , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022 , China.
ACS Appl Mater Interfaces. 2019 Aug 21;11(33):30453-30459. doi: 10.1021/acsami.9b09703. Epub 2019 Aug 8.
Anatase TiO used as the sodium-storage anode is coupled with a graphite cathode to construct dual-ion batteries. The batteries display wide voltage window (1.0-4.7 V), long cycling stability (98 mAh g after 1400 cycles at 500 mA g), and considerable rate performance (102 mAh g at 1500 mA g). Furthermore, the kinetic behaviors of Na and PF ions are investigated through electrochemical impedance spectroscopy, the galvanostatic intermittent titration technique, and the potentiostatic intermittent titration technique. The corresponding apparent ion diffusion coefficient is calculated, and the results indicate that the transport of PF anions in the graphite cathode is swift.
用作储钠阳极的锐钛矿型二氧化钛与石墨阴极耦合，以构建双离子电池。这些电池具有宽电压窗口（1.0 - 4.7 V）、长循环稳定性（在500 mA g下1400次循环后为98 mAh g）和可观的倍率性能（在1500 mA g下为102 mAh g）。此外，通过电化学阻抗谱、恒电流间歇滴定技术和恒电位间歇滴定技术研究了Na⁺和PF₆⁻离子的动力学行为。计算了相应的表观离子扩散系数，结果表明PF₆⁻阴离子在石墨阴极中的传输速度很快。
