Dual Hybrid Energy Storage Device with a Battery–Electrochemical Capacitor Hybrid Cathode and a Battery-Type Anode

Abstract

The design of appropriate material architectures and a judicious combination of storage modes are expected to deliver electrical energy storage devices of larger specific energy (E S ) and specific power (P S ). Herein, a battery−electrochemical capacitor hybrid material as a cathode [i.e., porous carbon filled with threedimensional MnCo 2 O 4 nanoflowers (3DMCNF), 3DMCNF-AC] and a corresponding battery component (3DMCNF) as an anode are used in a dual hybrid device using a 1 M LiPF 6 electrolyte. The cathodic and the anodic properties of the electrodes are separately studied in the half-cell configuration with respect to the Li/Li + electrode. The 3DMCNF-AC hybrid cathode showed larger specific capacitance (∼165 F•g −1 ) in the potential range (∼2 to 4.5 V vs Li/ Li + ) than that of a pure porous carbon cathode (∼115 F•g −1 , ∼2 to 4 V vs Li/Li + ) at 100 mA•g −1 cycling. The half-cell 3DMCNF anode showed a discharge capacity of ∼1020 mA•h•g −1 in the potential range of ∼0.01−3.0 V versus Li/Li + at a similar cycling condition to that of the cathode. The dual hybrid full device delivered ∼3.5 V with an E S of up to ∼153 W•h•kg −1 and a P S of up to ∼3500 W• kg −1 .

Endogenous Interfacial Mo−C/N−Mo‐S Bonding Regulates the Active Mo Sites for Maximized Li+ Storage Areal Capacity

“…These results validated the hybrid-type Li-ion storage mechanism that includes intercalation and pseudocapacitance. [66,67] It is anticipated that the integration of Mo 2 C-MoN and MoS 2 creates a synergistic effect, increases the effective contact area, and provides more accessible sites for rapid Li + diffusion that account for excellent electrochemical performance.…”