Mild Chemical Lithiation Strategy for Achieving Synergistic Lithium‐Compensation and Carbon‐Coating on SiO Anodes

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 24, 2025

Abstract Silicon monoxide (SiO x , ≈ 1) has emerged as a promising anode material for next‐generation lithium‐ion batteries (LIBs) due to its high theoretical capacity. However, commercial viability is hindered by low initial Coulombic efficiency (ICE) and insufficient cycling stability. Herein, mild chemical lithiation strategy proposed that synergistically integrates lithium‐compensation carbon‐coating address these challenges, significantly boosting the electrochemical performance of SiO anode. Biphenyl‐lithium/2‐methyltetrahydrofuran (Bp‐Li/2‐MeTHF) elaborately selected dual‐functional reagent ensure sufficient lithium incorporation into at room temperature simultaneously biphenyl (Bp *− ) radical in‐situ polymerizes, then converted carbon shell on silicon/lithium silicates core upon subsequent thermal annealing (Li‐SiO@C). This unique structure Li‐SiO@C effectively compensates irreversible loss buffers volume expansion, leading an exceptional ICE 91.0% remarkable capacity retention 92.2% after 500 cycles, far surpassing 72.9% 9.0% observed in pristine Moreover, demonstrates excellent moisture resistance well suited aqueous‐based electrode coating processes. work presents simple yet effective enhance anodes, offering strong potential large‐scale applications high‐energy‐density LIBs.

Language: Английский

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

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

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

Language: Английский

Enhanced performance of yolk-shell SiO/MWCNTs@C composites bridged by MWCNTs for high-performance lithium-ion battery anodes

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162297 - 162297

Published: April 1, 2025

Language: Английский