Synthetic Strategy of Si@void@C Nanoparticles for High-Performance Lithium-Ion Battery Anodes

Abstract

Silicon anode materials have the absolute predominance of high theoretical specific capacity, but its conductivity is low. What is more, the huge volume expansion (∼300%) of silicon during cycling causes rapid capacity fading. Herein, high-performance Si@void@C nanoparticles are synthesized by a unique ZnO template and mild strategy for the first time. Compared with the traditional synthesis method, a milder and environmentally friendly synthesis strategy provides a new feasible scheme for the large-scale commercialization of silicon anodes. The carbon layer blocks the silicon from the electrolyte and improves the conductivity of materials, and the yolk–void–shell structure accommodates the volume expansion of silicon during cycling. Si@void@C nanoparticles prepared with the ZnO template show excellent cycle and rate performances compared with the traditional synthetic strategy. After 500 cycles, the specific capacity of Si@void@C still maintains 934 mA h g–1 at 1 A g–1, and the average specific capacity is as high as 1125.4 mA h g–1 at a high current density of 4 A g–1. To sum up, the potential of Si@void@C anode for lithium-ion batteries cannot be underestimated.

Rapid, in situ synthesis of ultra-small silicon particles for boosted lithium storage capability through ultrafast Joule heating

“…Therefore, the stable electrochemical performance of us-Si/C is mainly due to the dominant role of nondiffusion-controlled components at higher scan rates. 39,45 Additionally, the us-Si/C electrode presents a larger capacitive contribution at all scan rates than that of Si/C, indicating its superior rate capability (Fig. S10 †).…”

Si/SnS2 Nanocomposite for Lithium Ion Battery Anodes

“…In order to meet the higher requirements of life and production for anode specific capacity, the development of high specific capacity anode materials that can replace graphite anodes has become a priority. After studying the charging and discharging characteristics of silicon-based materials, metal oxides and metal sulfides, it has been found that a single material has certain limitations, so researchers have focused on the research of composite anode materials. − …”