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Suppressing Self-discharge Of Supercapacitor By Using Electrorheological Effect
Aug 14, 2018

Supercapacitors are an important energy storage device, and supercapacitors have received wide attention due to their obvious advantages in cycle life, high speed charge and discharge, and safety. However, supercapacitors cannot effectively store energy for a long time due to self-discharge, which greatly limits the practical application of supercapacitors. In recent years, the literature reports that different methods have been applied to slow the self-discharge of supercapacitors, such as optimized modification of electrodes, electrolytes and membranes. Despite the excellent work done in suppressing the self-discharge of supercapacitors, it is still necessary to develop new and simpler and more effective methods to suppress the self-discharge of supercapacitors and expand their application in collecting and storing natural energy. Recently, under the guidance of Prof. Lu Xianmao and Academician Wang Zhonglin from the Beijing Institute of Nano-Energy and Systems, Chinese Academy of Sciences, Xia Mengyang, a graduate student of the research group, used 5CB liquid crystal by introducing a small amount of electro-rheological liquid crystal material 5CB into the activated carbon double-layer capacitor electrolyte. The electrorheological effect of the molecules aligned under the electric field of the electric double layer suppresses the diffusion of charged ions on the surface of the electrode, and significantly reduces the leakage current and the open circuit voltage decay of the electric double layer capacitor with time. In addition, since the leakage current of the capacitor to which 5CB is added is remarkably reduced, it is possible to exhibit higher charging efficiency when the friction nanogenerator (TENG) is charged. This also provides a direction for the practical application of supercapacitors.