Lithium-ion capacitor (LIC) is a hybrid energy storage device that combines the energy storage mechanism of lithium-ion batteries and supercapacitors and presents the complementary features of them. However, imbalances of the capacity and kinetics between cathode and anode are still remained challenges. Herein, to address the issue of low capacity in cathode, we constructed a morning glory-like porous material crimped from an opening sandwich structure consisting of hard carbon inner layer and soft carbon outer layer, by coating graphene oxide-containing flaky phenolic resin with coal tar pitch followed with carbonization and activation. Both the hard@soft carbon integrated design and the reduced graphene oxide network co-contributed to a favorable electrical conductivity and a developed microporosity. To against the sluggish kinetics limitation in anode, a structure-optimized MnO@C electrode prepared by pore-creating of CO2 from the MnCO3@polydopamine precursor was chosen due to its excellent rate performance. The LIC with this configuration can deliver a maximum energy density of 117.6 Wh kg-1 and an favorable capacity retention of 76% after 3000 cycles at 2050 W kg-1. Furthermore, the energy density of 27.8 Wh kg-1 can still be delivered even at a high power density of 10,250 W kg-1. In general, this well designed hybrid capacitor has a potential to make up the gap between lithium-ion batteries and supercapacitors.

Constructing high energy lithium-ion capacitor by using hard/soft integrated morning glory-like porous carbon as cathode and porous MnO@C as anode

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.