Ultracapacitor with improved aging performance

摘要

An energy storage device such as an electric double layer capacitor has positive and negative electrodes, each including a blend of respective first and second activated carbon materials having distinct pore size distributions. The blend (mixture) of first and second activated carbon materials may be equal in each electrode.

主权项

1. An energy storage device comprising:
a positive electrode and a negative electrode each comprising a first activated carbon material and a second activated carbon material; wherein the activated carbon content in the positive electrode is 50-75 wt. % first activated carbon material and 25-50 wt. % second activated carbon material, and the activated carbon content in the negative electrode is 25-50 wt. % first activated carbon material and 50-75 wt. % second activated carbon material, the first activated carbon material has a combined ultramicropore volume greater than the second activated carbon material, and each of the first activated carbon material and the second activated carbon material have <0.15 cm3/g combined pore volume of any pores having a size of >2 nm.