Durability of mesoporous carbon electrodes in electric double layer capacitors with organic electrolytes

抄録

The durability of MgO-templated mesoporous carbons as electrode materials for electric double layer capacitors was investigated at 3.0 and 3.2 V in propylene carbonate based electrolytes. Their capacitance retention was comparable to or slightly worse than that of microporous activated carbons at low current densities. On the other hand, at high current densities, the mesoporous carbons showed better stability than the microporous ones. Despite pore filling and the accumulation of products in the mesopores, numerous mesopores for the fast migration of ions were retained after the durability test. Regardless of the porosity of the electrode materials, pore filling was more significant on the negative electrode than on the positive electrode; therefore, capacitance degradation was dominated by the capacitance loss of the negative electrode.