CO2-derived nitrogen doped porous carbon as advanced anodes for lithium-ion capacitors

Abstract

Porous carbon is considered one of the most promising anode materials for lithium-ion capacitors due to its high ionic and electronic conductivity, high lithium storage capacitance and high chemical stability. However, the green and low-carbon preparation is a great challenge for the current porous carbon, especially for heteroatoms doped porous carbon. Herein, we report a low-carbon and environmentally friendly method to prepare N-doped porous carbon by the novel reaction of greenhouse gas CO2 with 5LiH-LiNH2. N-doped porous carbon delivers a reversible lithium storage capacity of 904 mAh g−1 at 0.1 A g−1, When paired with commercial activated carbon, the as-assembled lithium-ion capacitors provide a high energy density of 112 Wh kg−1 at a power density of 198.6 W kg−1 with a capacitance retention of 72% at 1.0 A g−1 after 6000 cycles. This work provides a green and low-carbon strategy for converting greenhouse gas CO2 into N-doped porous carbon for high-performance lithium-ion capacitors.