MoS/carbon composites prepared by ball-milling and pyrolysis for the high-rate and stable anode of lithium ion capacitors.

Lithium ion capacitors (LICs), bridging the advantages of batteries and electrochemical capacitors, are regarded as one of the most promising energy storage devices. Nevertheless, it is always limited by the anodes that accompany with low capacity and poor rate performance. Here, we develop a versatile and scalable method including ball-milling and pyrolysis to synthesize exfoliated MoS supported by N-doped carbon matrix derived from chitosan, which is encapsulated by pitch-derived carbon shells (MoS/CP).

Flexible C-MoC fiber film with self-fused junctions as a long cyclability anode material for sodium-ion battery.

Electrospun carbon fiber films have high contact resistance at the fiber junctions, which causes poor cycling stability and limits their further improvement in energy storage performances. To eliminate the contact resistance of the film, we provide a new strategy to fuse the fiber junctions by introducing MoO in the fibers, which replaces the C-C interface by a more active C-MoO-C interface at the fiber junction to promote mass transfer. MoO reacts with C matrix to generate MoC and form self-fused junctions during the carbonization process.