Year: 2025
Type: article
Abstract: The structural evolution of silicon oxide/graphite (SiOx/Gr) composite anodes under SiOx expansion is systematically investigated to address the lack of in‐depth studies on the mechanical disparities between Si‐based materials and graphite during operation. In this work, the electrode structure evolution is evaluated with a series of composite anodes with different SiOx/Gr ratios through electrochemical performance tests and structural characterization, focusing on pore growth and solid electrolyte interphase (SEI) renewal induced by active material volume changes. The results reveal that the continuous volume change of SiOx leads to uneven stress distribution within the electrode, which further causes mechanical fatigue and structural fractures of active materials. Notably, the replacement of modified SiOx material with artificial coating improves structural integrity and cycling performance, enabling the composite anode to maintain a capacity of 373 mA h g−1 even at 1 A g−1 after 1000 cycles. These findings demonstrate that optimizing stress distribution and structural evolution is critical for enhancing the mechanical stability and electrochemical performance of SiOx/Gr composite anodes. This study provides fundamental insights into the failure mechanisms of SiOx/Gr composite anodes and highlights the necessity of rational electrode design strategies to develop high‐capacity, long‐cycle‐life anode materials for next‐generation lithium‐ion batteries.
Source: Batteries & Supercaps
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4409466155