自放电
材料科学
超级电容器
电容器
储能
电场
电极
电压
功率密度
锂(药物)
电压降
光电子学
电解质
电化学
双电层电容器
功率(物理)
电气工程
化学
内分泌学
物理化学
工程类
物理
医学
量子力学
作者
Yuzuo Wang,Xu‐Yi Shan,Dawei Wang,Hui‐Ming Cheng,Feng Li
标识
DOI:10.1016/j.jechem.2019.04.004
摘要
Self-discharge is a significant issue in electric double layer energy storage, which leads to a rapid voltage drop and low energy efficiency. Here, we attempt to solve this problem by changing the structure of the electric double layer into a de-solvated state, by constructing a nano-scale and ion-conductive solid electrolyte layer on the surface of a carbon electrode. The ion concentration gradient and potential field that drive the self-discharge are greatly restricted inside this electric double layer. Based on this understanding, a high-efficiency graphene-based lithium ion capacitor was built up, in which the self-discharge rate is reduced by 50% and the energy efficiency is doubled. The capacitor also has a high energy density, high power output and long life, and shows promise for practical applications.
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