The asymmetric capacitors are one of the energy storage systems that provide high energy density and high power density. However, there are some limitations which impede the development of asymmetric capacitors. In this context, we designed a new type of lithium-selenium asymmetric capacitor (LSEC) that has both the capacitive effect and the diffusion-controlled reaction. The LSECs use the activated carbon-selenium (AC-Se) as a mixed cathode material and the pre-lithiated graphite as an anode material which can exhibit the electrochemical reduction/oxidation of Se and the adsorption/desorption of anions at substantially the same rate. This novel LSEC solves the problem of imbalance between the energy and the dynamics, and provides a solution to provide both high energy density and high power density, thus has great application potential.

非对称电容器是提供高能量密度和高功率密度的能量存储系统之一。但是，存在一些限制，阻碍了不对称电容器的发展。在这种情况下，我们设计了一种新型的锂硒不对称电容器（LSEC），该电容器兼具电容效应和扩散控制的反应。LSEC使用活性炭-硒（AC-Se）作为混合阴极材料，并将预锂化石墨用作阳极材料，它们可以以基本上相同的速率展现Se的电化学还原/氧化和阴离子的吸附/解吸。 。该新型LSEC解决了能量与动力学之间的不平衡问题，并提供了同时提供高能量密度和高功率密度的解决方案，因此具有巨大的应用潜力。