Pomegranate-type Si/C anode with SiC taped, well-dispersed tiny Si particles for lithium-ion batteries

Abstract

Severe volume expansion and inherently poor lithium ion transmission are two major problems of silicon anodes. To address these issues, we proposed a pomegranate-type Si/C composite anode with highly dispersed tiny silicon particles as the core assisted by small amount of SiC. Skillfully exploiting the high heat from magnesiothermic reduction, SiC can assist the good dispersion of silicon and provide good interface compatibility and chemical stability. The silicon anchored to the carbon shell provides multipoint contact mode, that together with the carbon shell frame, significantly promoting the transfer of dual charge. Besides, the pomegranate-type microcluster structure also improves the tap density of the electrode, reduces the direct contact area between active material and electrolyte, and enhances the electrochemical performance.

Strategies for Controlling or Releasing the Influence Due to the Volume Expansion of Silicon inside Si−C Composite Anode for High-Performance Lithium-Ion Batteries

“…The external carbon cage, the middle void space, and the pore of the internal Si adapted to the volume changes of Si and ensured the stability of the external carbon cage, so that the whole composite had significantly less volume expansion during the lithiation process. A pomegranate-type PSi−C [209] composite was prepared by extracting silicon using magnesiothermic reduction. This method controlled the porosity and structure of the silicon [210,211] and produced a small amount of SiC to repair the silicon particles on the C shell, which provided a multi-point contact mode for silicon particles and more Li + /e − transmission channels.…”

A novel design of 3D carbon host for stable lithium metal anode

“…Exploring and developing new energy and renewable clean energy have become top priorities to solve energy and environmental issues 1,2 . Among various new energy technologies, lithium‐ion batteries (LIBs) play an increasingly important role in the national economy and daily life due to their high energy density, cleanliness, and convenience 3,4 . Nevertheless, the requirements for energy storage technologies with higher energy density seemingly never stop with the development of technology.…”

“…1,2 Among various new energy technologies, lithium-ion batteries (LIBs) play an increasingly important role in the national economy and daily life due to their high energy density, cleanliness, and convenience. 3,4 Nevertheless, the requirements for energy storage technologies with higher energy density seemingly never stop with the development of technology. The current development of LIBs cannot match the speed of technological change.…”

Dendrites‐Free Lithium Metal Anode Enabled by Synergistic Surface Structural Engineering

“…To resolve the above issues, various strategies including solid electrolyte, [ 6–10 ] artificial SEI, [ 11–15 ] and Li host design [ 16–19 ] have been adapted, and they all show certain improvement in the electrochemical performance. Nonetheless, the interfacial resistance between the electrode and solid electrolyte is extremely higher than that of the liquid one, which will deteriorate the electrochemical performance of the cells.…”

“…Moreover, the internal short circuit and safety hazards may be triggered by piercing the separator, especially under high current density and large capacity. [3][4][5] To resolve the above issues, various strategies including solid electrolyte, [6][7][8][9][10] artificial SEI, [11][12][13][14][15] and Li host design [16][17][18][19] have been adapted, and they all show certain improvement in the electrochemical performance. Nonetheless, the interfacial resistance between the electrode and solid electrolyte is extremely higher than that of the liquid one, which will deteriorate the electrochemical performance of the cells.…”