Wei Zheng , Joseph Halim , Per O.Å. Persson , Johanna Rosen , Michel W. Barsoum
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引用次数: 16
摘要
基于mxene的水对称超级电容器(ssc)因其良好的速率性能和绿色特性而受到广泛的关注。然而,要达到远高于1.2 V的电压仍然是一个挑战,这大大降低了它们的能量密度。在此,我们报道了在19.5 M LiCl电解质中具有高电压的Mo1.33CTz mxene基ssc。得益于Mo1.33CTz丰富的空位结构和高稳定电位窗口,在1.4 V工作电压下,获得的ssc在功率密度为196.6 mW cm - 3时的最大能量密度为38.2 mWh cm - 3,同时具有优异的速率性能和令人惊叹的循环稳定性。这种高浓度的LiCl电解质也适用于研究最广泛的MXene Ti3C2Tz,在功率密度为165.2 mW cm - 3,工作电压为1.8 V时,最大能量密度为41.3 mWh cm - 3。随着功率的增加,Ti3C2Tz电池的能量密度下降幅度大于mo基电池。这项工作为开发具有高电压和高能量密度的高性能ssc提供了路线图。
MXene-based symmetric supercapacitors with high voltage and high energy density
MXene-based aqueous symmetric supercapacitors (SSCs) are attractive due to their good rate performances and green nature. However, it remains a challenge to reach voltages much over 1.2 V, which significantly diminishes their energy density. Herein, we report on Mo1.33CTz MXene-based SSCs possessing high voltages in a 19.5 M LiCl electrolyte. Benefiting from the vacancy-rich structure and high stable potential window of Mo1.33CTz, the obtained SSCs deliver a maximum energy density of >38.2 mWh cm−3 at a power density of 196.6 mW cm−3 under an operating voltage of 1.4 V, along with excellent rate performance and impressive cycling stability. This highly concentrated LiCl electrolyte is also applicable to Ti3C2Tz, the most widely studied MXene, achieving a maximum energy density of >41.3 mWh cm−3 at a power density of 165.2 mW cm−3 with an operating voltage of 1.8 V. The drop in energy density with increasing power in the Ti3C2Tz cells was steeper than for the Mo-based cells. This work provides a roadmap to develop superior SSCs with high voltages and high energy densities.