Silicon nanowire anodes for lithium-ion microbatteries

Beschreibung

The increasing demand for miniaturized autonomous electronic systems requires on-chip energy storage technologies with high energy and power densities that are compatible with standard microfabrication processes. Silicon (Si)-based lithium-ion microbatteries (micro-LIBs) are promising candidates due to its high theoretical specific capacity. However, their performance is limited by planar architectures and the mechanical instability of Si anodes. To address these challenges, three-dimensional (3D) vertically aligned Si nanowire (SiNW) arrays were developed using top-down nanofabrication techniques, namely, cryogenic deep reactive ion etching (cryo-DRIE) and metal-assisted chemical etching (MACE). Electrochemical characterization in half-cell configurations revealed that SiNW anodes significantly outperform planar Si, exhibiting higher areal capacity, Coulombic efficiency, rate capability, and cycling stability. Increasing SiNW height further enhances areal capacity. Post-mortem analyses confirm that SiNW structures maintain structural integrity upon cycling. Pre-lithiation and carbon coating were investigated as performance enhancement strategies. While pre-lithiation improves initial efficiency, non-uniform lithiation in dense SiNW arrays remains a limitation. Carbon coating enhances initial capacity and stability yet degrades during prolonged cycling. Overall, this work demonstrates that top-down-fabricated SiNW anodes are a promising platform for high-performance micro-LIBs and provides insight into the relationship between nanostructure design, fabrication, and electrochemical behavior.

Autor*in

Andam Deatama Refino

Themen in »Silicon nanowire anodes for lithium-ion microbatteries«

Silicon Nanowire Lithium-ion battery

Stimmen zu »Silicon nanowire anodes for lithium-ion microbatteries«

Details

Link teilen