Progress in the fast charging of high-capacity silicon monoxide(SiO)-based anode is currently hindered by insufficient conductivity and notable volume expansion.The construction of an interface conductive network effe...Progress in the fast charging of high-capacity silicon monoxide(SiO)-based anode is currently hindered by insufficient conductivity and notable volume expansion.The construction of an interface conductive network effectively addresses the aforementioned problems;however,the impact of its quality on lithium-ion transfer and structure durability is yet to be explored.Herein,the influence of an interface conductive network on ionic transport and mechanical stability under fast charging is explored for the first time.2D modeling simulation and Cryo-transmission electron microscopy precisely reveal the mitigation of interface polarization owing to a higher fraction of conductive inorganic species formation in bilayer solid electrolyte interphase is mainly responsible for a linear decrease in ionic diffusion energy barrier.Furthermore,atomic force microscopy and Raman shift exhibit substantial stress dissipation generated by a complete conductive network,which is critical to the linear reduction of electrode residual stress.This study provides insights into the rational design of optimized interface SiO-based anodes with reinforced fast-charging performance.展开更多
The dissolution of alumina-based refractory ceramics in CaO-Al2O3-SiO_(2)slag melts was performed based on the in-situ observation system of an ultra-high-temperature laser confocal microscope,and the effect of the Ca...The dissolution of alumina-based refractory ceramics in CaO-Al2O3-SiO_(2)slag melts was performed based on the in-situ observation system of an ultra-high-temperature laser confocal microscope,and the effect of the CaO/SiO_(2)slag mass ratio(C/S ratio)on the dissolution rate of alumina-based refractory ceramics was investigated.The results indicate that the dissolution rate increases with an increase of the C/S ratio and is mainly controlled by diffusion.During the early stage of dissolution,for all C/S ratios,the dissolution process conforms to the classical invariant interface approximation model.During the later stage of dissolution,when the C/S ratio is≥6,the dissolution process is significantly different from the model above because of the formation of a thick interfacial layer,which can be explained by dissolution kinetics.展开更多
硅基负极材料因具有较高的充放电容量而备受瞩目。SiO是硅基材料中最具商业应用意义的材料。目前SiO生产企业采用的坩埚和加热元件均选用高纯石墨材质,存在腐蚀问题。在本研究中,我们对高真空下常规坩埚材质(石墨、刚玉、碳化硅、氮化...硅基负极材料因具有较高的充放电容量而备受瞩目。SiO是硅基材料中最具商业应用意义的材料。目前SiO生产企业采用的坩埚和加热元件均选用高纯石墨材质,存在腐蚀问题。在本研究中,我们对高真空下常规坩埚材质(石墨、刚玉、碳化硅、氮化硼、氮化铝和氮化硅)和常规加热元件材质(石墨棒、硅碳棒和硅钼棒)在SiO生产过程平衡产物分布情况进行模拟。结果表明,碳化硅仅在温度超过1080℃时发生较少量的腐蚀,而氮化硼在温度高于1170℃时不被腐蚀,在温度低于1170℃时会被腐蚀生成Si 2 N 2O和B,该物相不与反应物料进一步反应。综合考虑其成本,SiO生产的反应容器材质宜选用SiC。对于加热元件材质的选择,硅碳棒和氧化气氛预处理后的硅钼棒均具有较少的腐蚀倾向,但从加热温度考虑,SiO生产的加热元件材质宜选用预处理后的硅钼棒。展开更多
基金the National Natural Science Foundation of China(Nos.22209095 and 22238004).
文摘Progress in the fast charging of high-capacity silicon monoxide(SiO)-based anode is currently hindered by insufficient conductivity and notable volume expansion.The construction of an interface conductive network effectively addresses the aforementioned problems;however,the impact of its quality on lithium-ion transfer and structure durability is yet to be explored.Herein,the influence of an interface conductive network on ionic transport and mechanical stability under fast charging is explored for the first time.2D modeling simulation and Cryo-transmission electron microscopy precisely reveal the mitigation of interface polarization owing to a higher fraction of conductive inorganic species formation in bilayer solid electrolyte interphase is mainly responsible for a linear decrease in ionic diffusion energy barrier.Furthermore,atomic force microscopy and Raman shift exhibit substantial stress dissipation generated by a complete conductive network,which is critical to the linear reduction of electrode residual stress.This study provides insights into the rational design of optimized interface SiO-based anodes with reinforced fast-charging performance.
基金supported by the National Natural Science Foundation of China(52272022)the Special Project of Central Government for Local Science and Technology Development of Hubei Province(2019ZYYD076)the Innovation and Entrepreneurship Fund of Wuhan University of Science and Technology(D202202171045002669).
文摘The dissolution of alumina-based refractory ceramics in CaO-Al2O3-SiO_(2)slag melts was performed based on the in-situ observation system of an ultra-high-temperature laser confocal microscope,and the effect of the CaO/SiO_(2)slag mass ratio(C/S ratio)on the dissolution rate of alumina-based refractory ceramics was investigated.The results indicate that the dissolution rate increases with an increase of the C/S ratio and is mainly controlled by diffusion.During the early stage of dissolution,for all C/S ratios,the dissolution process conforms to the classical invariant interface approximation model.During the later stage of dissolution,when the C/S ratio is≥6,the dissolution process is significantly different from the model above because of the formation of a thick interfacial layer,which can be explained by dissolution kinetics.
文摘硅基负极材料因具有较高的充放电容量而备受瞩目。SiO是硅基材料中最具商业应用意义的材料。目前SiO生产企业采用的坩埚和加热元件均选用高纯石墨材质,存在腐蚀问题。在本研究中,我们对高真空下常规坩埚材质(石墨、刚玉、碳化硅、氮化硼、氮化铝和氮化硅)和常规加热元件材质(石墨棒、硅碳棒和硅钼棒)在SiO生产过程平衡产物分布情况进行模拟。结果表明,碳化硅仅在温度超过1080℃时发生较少量的腐蚀,而氮化硼在温度高于1170℃时不被腐蚀,在温度低于1170℃时会被腐蚀生成Si 2 N 2O和B,该物相不与反应物料进一步反应。综合考虑其成本,SiO生产的反应容器材质宜选用SiC。对于加热元件材质的选择,硅碳棒和氧化气氛预处理后的硅钼棒均具有较少的腐蚀倾向,但从加热温度考虑,SiO生产的加热元件材质宜选用预处理后的硅钼棒。
