One-dimensional Fe7S8 nanorods encapsulated in N, S co-doped carbon shells accelerate lithium storage kinetics for lithium-ion capacitors

Abstract The slow kinetics of battery-type anode materials for lithium-ion capacitors (LICs) hinder their matching with capacitive-type cathodes. Designing anode materials with greater capacity and improved rate performance is a key to solving this challenge. Here, we fabricated one-dimensional N, S co-doped carbon encapsulated Fe7S8 nanorods to realize fast lithium storage kinetics and stable cycling performance. The matched Fe7S8@C//AC LICs achieved an extraordinary energy density of 101 Wh kg−1 and a power density of 3927 W kg−1.