The preparation of SiOₓ materials that exhibit enduring stable cycling performance and high initial coulombic efficiency(ICE)through cost-effective methods remains a substantial hurdle.Herein,a hybrid carbon-coated Si...The preparation of SiOₓ materials that exhibit enduring stable cycling performance and high initial coulombic efficiency(ICE)through cost-effective methods remains a substantial hurdle.Herein,a hybrid carbon-coated SiO-20/G@TMA composite was synthesized using an integrated strategy that combines high-energy ball milling and high-temperature carbonization,employing graphene(G)and trimeric acid(TMA)as carbon sources.The three-dimensional crosslinked conductive network,formed by the mechanically flexible graphene and the carbon-rigid TMA,induces the generation of a LiF-rich SEI film.This film reduces interfacial side reactions and improves the ICE to 74.2%.Furthermore,the SiO-20/G@TMA electrode,characterized by a rigid–flexible hybrid structure,demonstrates excellent capacity retention and impressive rate performance over extended cycling periods.The discharge capacity of the SiO-20/G@TMA anode reaches 848.3 mA h g⁻¹at a current density of 0.5 A g⁻¹,with a reversible capacity of 77%(about 649.1 mA h g⁻¹)maintained after 600 cycles.When paired with a LiNi₀.₈Co₀.₁Mn₀.₁O₂(NCM811)cathode,the SiO-20/G@TMA anode achieves a reversible capacity of 140.0 mA h g⁻¹at the current density of 0.2 A g⁻¹.After 100 cycles,the capacity retention rate is 85%and the energy density is 474.7 Wh kg⁻¹.展开更多
基金the Nature Science Foundation of Xinjiang Province(2022B01024,2022D01E35 and 2022D01A105)the Tianshan Excellence Programme(2023TSYCCX0040)+1 种基金Open project of the State Key Laboratory of Chemistry and Utilization of Carbon based Energy Resources(KFKT2022PY-00012)the Autonomous Region Colleges and Universities Basic Research Operating Expenses Scientific Research Project(XJEDU:2024P029).
文摘The preparation of SiOₓ materials that exhibit enduring stable cycling performance and high initial coulombic efficiency(ICE)through cost-effective methods remains a substantial hurdle.Herein,a hybrid carbon-coated SiO-20/G@TMA composite was synthesized using an integrated strategy that combines high-energy ball milling and high-temperature carbonization,employing graphene(G)and trimeric acid(TMA)as carbon sources.The three-dimensional crosslinked conductive network,formed by the mechanically flexible graphene and the carbon-rigid TMA,induces the generation of a LiF-rich SEI film.This film reduces interfacial side reactions and improves the ICE to 74.2%.Furthermore,the SiO-20/G@TMA electrode,characterized by a rigid–flexible hybrid structure,demonstrates excellent capacity retention and impressive rate performance over extended cycling periods.The discharge capacity of the SiO-20/G@TMA anode reaches 848.3 mA h g⁻¹at a current density of 0.5 A g⁻¹,with a reversible capacity of 77%(about 649.1 mA h g⁻¹)maintained after 600 cycles.When paired with a LiNi₀.₈Co₀.₁Mn₀.₁O₂(NCM811)cathode,the SiO-20/G@TMA anode achieves a reversible capacity of 140.0 mA h g⁻¹at the current density of 0.2 A g⁻¹.After 100 cycles,the capacity retention rate is 85%and the energy density is 474.7 Wh kg⁻¹.
