In Situ Fabrication of Porous Co_xP Hierarchical Nanostructures on Carbon Fiber Cloth with Exceptional Performance for Sodium Storage

Abstract

Superior high‐rate performance and ultralong cycling life have been constantly pursued for rechargeable sodium‐ion batteries (SIBs). In this work, a facile strategy is employed to successfully synthesize porous CoxP hierarchical nanostructures supported on a flexible carbon fiber cloth (CoxP@CFC), constructing a robust architecture of ordered nanoarrays. Via such a unique design, porous and bare structures can thoroughly expose the electroactive surfaces to the electrolyte, which is favorable for ultrafast sodium‐ion storage. In addition, the CFC provides an interconnected 3D conductive network to ensure firm electrical connection of the electrode materials. Besides the inherent flexibility of the CFC, the integration of the hierarchical structures of CoxP with the CFC, as well as the strong synergistic effect between them, effectively help to buffer the mechanical stress caused by repeated sodiation/desodiation, thereby guaranteeing the structural integrity of the overall electrode. Consequently, CoxP@CFC as an anode shows a record‐high capacity of 279 mAh g−1 at 5.0 A g−1 with almost no capacity attenuation after 9000 cycles.

A Stress Self‐Adaptive Structure to Suppress the Chemo‐mechanical Degradation for High Rate and Ultralong Cycle Life Sodium Ion Batteries

“…[2] Nevertheless, the practical applications of TMPs anodes are hindered by their serious volume expansion during the continuous charge/discharge process thus leading severe chemo-mechanical degradation upon long-term cycling, and the sluggish electronic conductivity of TMPs would generally cause poor rate capability. [3] Abundant strategies have been applied to solve the above issues, including reducing the particle size, [4] manipulating the microstructures of TMPs, [5] introducing buffer matrix materials, [6] and so on. [7] For instance, downsizing TMP particles to nano-scale could efficiently shorten the charge transfer length, while introducing a carbon buffer matrix could alleviate the volume expansion and meanwhile increase the overall electronic conductivity.…”

Metal Ions Confined in Periodic Pores of MOFs to Embed Single‐Metal Atoms within Hierarchically Porous Carbon Nanoflowers for High‐Performance Electromagnetic Wave Absorption

“…[3] In this regard, 3D hierarchically porous carbon nanostructures (3D HPCs), featuring adjustable porous structure, large specific surface area, plenteous propagation paths, and high conductivity, have aroused considerable interest among the researchers. [4][5][6][7] The high electric conductivity of the 3D HPCs makes electrons migrate more easily compared to the counterparts with a…”

“…[ 3 ] In this regard, 3D hierarchically porous carbon nanostructures (3D HPCs), featuring adjustable porous structure, large specific surface area, plenteous propagation paths, and high conductivity, have aroused considerable interest among the researchers. [ 4–7 ] The high electric conductivity of the 3D HPCs makes electrons migrate more easily compared to the counterparts with a low conductivity, which can improve the conduction loss for the EMW absorption capacity to some extent. The multiple levels of porosity can allow more incident EMWs to enter the interior of the 3D HPCs, thereby boosting their impedance matching characteristics.…”

In Situ Growth of CoP Nanosheet Arrays on Carbon Cloth as Binder‐Free Electrode for High‐Performance Flexible Lithium‐Ion Batteries

“…[ 24,25,27 ] In addition, the presence of inactive binders in traditional rigid electrodes based on slurry coating causes many invalid interfaces and poor contact of active material with the current collector, which leads to exfoliation of the active material from the current collector and poor kinetics during charge/discharge. [ 28,29 ]…”

“…[24,25,27] In addition, the presence of inactive binders in traditional rigid electrodes based on slurry coating causes many invalid interfaces and poor contact of active material with the current collector, which leads to exfoliation of the active material from the current collector and poor kinetics during charge/discharge. [28,29] To overcome these challenges, many strategies have been proposed to achieve high-performance CoP anodes. First, the nanoscale design of CoP should effectively reduce the electron/ ion transport paths, such as nanowires, [27] nanorods, [25,26,30] nanoparticles.…”