Scalable 2D Mesoporous Silicon Nanosheets for High‐Performance Lithium‐Ion Battery Anode

Abstract

Constructing unique mesoporous 2D Si nanostructures to shorten the lithium-ion diffusion pathway, facilitate interfacial charge transfer, and enlarge the electrode-electrolyte interface offers exciting opportunities in future high-performance lithium-ion batteries. However, simultaneous realization of 2D and mesoporous structures for Si material is quite difficult due to its non-van der Waals structure. Here, the coexistence of both mesoporous and 2D ultrathin nanosheets in the Si anodes and considerably high surface area (381.6 m g ) are successfully achieved by a scalable and cost-efficient method. After being encapsulated with the homogeneous carbon layer, the Si/C nanocomposite anodes achieve outstanding reversible capacity, high cycle stability, and excellent rate capability. In particular, the reversible capacity reaches 1072.2 mA h g at 4 A g even after 500 cycles. The obvious enhancements can be attributed to the synergistic effect between the unique 2D mesoporous nanostructure and carbon capsulation. Furthermore, full-cell evaluations indicate that the unique Si/C nanostructures have a great potential in the next-generation lithium-ion battery. These findings not only greatly improve the electrochemical performances of Si anode, but also shine some light on designing the unique nanomaterials for various energy devices.

A Facile Strategy to Construct Silver‐Modified, ZnO‐Incorporated and Carbon‐Coated Silicon/Porous‐Carbon Nanofibers with Enhanced Lithium Storage

“…In addition, as shown in Figure c, the simple pouch full cell used as a power source can simultaneously light light two light emitting diode (LED) screens and drive motor to rotate rapidly, delivering a stable energy output. Unlike most previous reports based on coin‐sized full battery routine without considering comprehensive assessment on real factors including the weight of the electrolyte, current collector, separator, and case in a pouch cell configuration, the obtained results in this work can provide more practical reference value for LIBs. Undoubtedly, this refined method about simple pouch full cell show great potential in the application of fundamental research for other researchers and the successful Ag/ZnO‐Si@C‐PCNF composite has a great commercial potential for the high‐performance LIBs.…”

Top‐Down Synthesis of Silicon/Carbon Composite Anode Materials for Lithium‐Ion Batteries: Mechanical Milling and Etching

“…Considerable efforts have been dedicated in the past two decades to develop proper Si nanostructures with well‐controlled morphology, size and shape to ameliorate the electrochemical performances of Si‐based anode materials. Si nanostructures such as nanoparticles, nanowires, nanotubes and nanosheets are designed to relieve mechanical strain. Porous Si, hollow spheres, yolk–shell structures, and their carbon composites are also designed to provide appropriate space for Si expansion.…”

Conjugation with carbon nanotubes improves the performance of mesoporous silicon as Li-ion battery anode

“…New binders, binder architectures and electrolyte additives are being studied to mitigate this obstacle [7][8][9] . The current approaches to overcome the issue with silicon are typically based on different nanomaterials like nanoparticles, nanowires and thin films [10][11][12] . However, the complicated nanostructures circumvent the problem only on the laboratory scale due to expense of the material production and difficulties in the production scale-up 6 .…”