Tuning size and composition of Si/CNT composite microspheres via droplet-microfluidics for high performance lithium-ion batteries

Abstract

Designing and synthesizing Si/C composites with a certain structure is an effective strategy to improve the performance of silicon anode materials for practical applications. Herein, we prepared Si/CNT composite microspheres with decent size uniformity and perfect spherical structure using droplet-microfluidics. The size and structure can be easily regulated by tuning the mass fraction of the precursor in the microfluidic device. The Si/CNT composite microspheres exhibited a narrow particle size distribution (coefficient of variation <15%) and a unique structure, where the silicon nanoparticles with an amorphous SiOx layer are uniformly encapsulated in a framework formed by CNTs (Carbon Nanotubes). In addition, the electrochemical performance of electrodes prepared with Si/CNT composite microspheres of different sizes and compositions was investigated, while the underlying mechanism is understood by both physical characterization and electrochemical measurement. This work lays the foundation for the rational design of Si/C composites and develops a new avenue for its commercialization.

Preparation of μ-HMX/C-Based Composite Energy Composite Microspheres by Microdroplet Technology

“…Microdroplet technology is to realize microscale uniform droplets by controlling the fluid and to solve the difficulties in the traditional production process by controlling the reaction process in the droplets. − Microdroplet technology has a wide range of applications in the fields of biomedicine, chemical synthesis, and material modification and provides a new direction for the preparation of composite explosives. − Different droplet formation methods include coaxial droplet chips, , T-shaped droplet chips, , and cross-focused focused droplet chips. , Domestic and foreign teams have successfully applied microdroplet technology in the field of energy-containing materials. In 2018, Wu et al realized the integrated preparation of CL-20/TNT eutectic assembly and spherical coatings.…”