In‐Situ Fabrication of Bone‐Like CoSe₂ Nano‐Thorn Loaded on Porous Carbon Cloth as a Flexible Electrode for Na‐Ion Storage

Abstract

Sodium-ion batteries (SIBs) based on flexible electrode materials are being investigated recently for improving sluggish kinetics and developing energy density. Transition metal selenides present excellent conductivity and high capacity; nevertheless, their low conductivity and serious volume expansion raise challenging issues of inferior lifespan and capacity fading. Herein, an in-situ construction method through carbonization and selenide synergistic effect is skillfully designed to synthesize a flexible electrode of bone-like CoSe 2 nano-thorn coated on porous carbon cloth. The designed flexible CoSe 2 electrode with stable structural feature displays enhanced Na-ion storage capabilities with good rate performance and outstanding cycling stability. As expected, the designed SIBs with flexible BLÀ CoSe 2 /PCC electrode display excellent reversible capacity with 360.7 mAh g À 1 after 180 cycles at a current density of 0.1 A g À 1 .[a] Dr.

Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced supercapacitors and sodium-ion batteries

“…Nevertheless, for supercapacitor, NiCo2Se4 suffers from poor cycling stability caused by the pulverization occurring of electrodes during repeated charge and discharge. In terms of SIBs, compared to carbon materials, NiCo2Se4 as conversion electrode suffers from low conductivity and sluggish ion/electrontransport kinetics, which lead to substantial degradation of cycling stability and hinder the practical applications [14].…”

Porous Microspheres Comprising CoSe2 Nanorods Coated with N-Doped Graphitic C and Polydopamine-Derived C as Anodes for Long-Lived Na-Ion Batteries

“…Recently, Na-ion batteries (NIBs) have drawn increasing attention as a feasible alternative to commercial Li-ion batteries (LIBs) in the energy storage field because Na has a rechargeable electrochemical reaction similar to Li of LIBs and is more widespread and abundant than lithium [1][2][3][4][5][6]. Accordingly, transitional metal selenides (TMSs) as promising anodes for NIBs have also been intensively investigated in recent times [1][2][3][4][5][6][7][8]. In general, TMSs show superior Naion storage capability than other transitional metal oxides and sulfides [3,9].…”

“…In particular, the capacity decay of cells for NIBs with TMS anodes is seriously induced under the carbonate-based electrolyte system, which has high activation-energy barrier for Na-ion diffusion on the structure and low stability during repeated cycles [12,13]. Moreover, the low electrical conductivity of TMSs instigates high cell resistance, resulting in low specific capacities of cell [4][5][6]. Thus, to solve the problems of TMSs, particularly for poor cycle stability of NIBs under practically profitable carbonate-based electrolyte system, the structural design of TMSs electrode materials is essential and has been proved to be an effective strategy over the past decade [4,5].…”

Flexible electronics based on 2D transition metal dichalcogenides

“…Furthermore, owing to the ber shape, the electrode can supply energy to a LED light when matched to a Na metal as the cathode, at a bending angle of 120 or even 150 . Guo et al 263 developed an electrode based on bone-like CoSe 2 nano-thorns on the porous carbon cloth (PCC). An in situ growth strategy has been used for the deposition of CoSe 2 nano-thorns, leading to superior structural stability, enhanced conductivity, and alleviated volume variation.…”