Microstructure and Electrochemical Performance of Li2CO3-Modified Submicron SiO as an Anode for Lithium-Ion Batteries

• DOI: 10.1021/acsami.4c21119
• Publication Date: 2025-03-24T23:33:40Z
• Authors: Zhiheng Tang; Ying Zhou; Birong Luo; Dejun Li; Bo Zhang

Silicon monoxide (SiO) holds great potential as a next-generation anode material for commercial lithium-ion batteries due to its high theoretical specific capacity. However, poor cycling stability and low initial Coulombic efficiency (ICE) present substantial challenges practical application. Herein, we modified the structure of SiO through ball milling, followed by heating with addition network modifier Li2CO3. The submicrometer-sized reduces Li+ diffusion pathways within bulk, facilitating insertion/extraction process enabling excellent rate performance. Controlling size silicon nanodomains enhances structural during cycling, thereby significantly improving stability. increased crystallinity SiO2 suppresses irreversible reactions, leading higher ICE. Moreover, ions trapped Si-O-Si form lithium silicate glass-like phase, which provides efficient material, enhancing electrochemical optimized submicrometer was mixed graphite coated carbon produce SiO/graphite@carbon composite anode. When assembled into half-cell, exhibited an discharge capacity 1277.0 mA h g-1 at 0.1 A g-1, ICE 74.3%. And this demonstrated retention 79.7% after 300 cycles 0.5 g-1. Furthermore, capability testing, it achieved 428.9 1.6