Enhancing the energy density of all‐solid‐state batteries(ASSBs)with lithium metal anodes is crucial,but lithium dendrite‐induced short circuits limit fast‐charging capability.This study presents a high‐power ASS...Enhancing the energy density of all‐solid‐state batteries(ASSBs)with lithium metal anodes is crucial,but lithium dendrite‐induced short circuits limit fast‐charging capability.This study presents a high‐power ASSB employing a novel,robust solid electrolyte(SE)with exceptionally high stability at the lithium metal/SE interface,achieved via site‐specific Nb doping in the argyrodite structure.Pentavalent Nb incorporation into Wyckoff 48h sites enhances structural stability,as confirmed by neutron diffraction,X‐ray absorption spectroscopy,magic angle spinning nuclear magnetic resonance,and density functional theory calculations.While Nb doping slightly reduces ionic conductivity,it significantly improves interfacial stability,suppressing dendrite formation and enabling a full cell capable of charging in just 6 min(10‐C rate,16 mA cm^(-2)).This study highlights,for the first time,that electrochemical stability,rather than ionic conductivity,is key to achieving high‐power performance,advancing the commercialization of lithium metal‐based ASSBs.展开更多
通过焊接热影响区最高硬度试验、斜Y形坡口焊接裂纹试验、典型对接接头性能评价试验及典型对接接头疲劳性能试验,结合金相显微镜(optical microscope,OM)和扫描电子显微镜(scanning electron microscope,SEM)两种表征手段,深入研究了新...通过焊接热影响区最高硬度试验、斜Y形坡口焊接裂纹试验、典型对接接头性能评价试验及典型对接接头疲劳性能试验,结合金相显微镜(optical microscope,OM)和扫描电子显微镜(scanning electron microscope,SEM)两种表征手段,深入研究了新型低锰微铌钢(MnNb钢)与普通Q355钢(Q355钢)焊接性能差异及机理。结果表明,在不预热条件下,Q355钢表现出强烈的焊接淬硬倾向,而MnNb钢无淬硬倾向;MnNb钢和Q355钢均具备优良的防止焊接冷裂纹性能。相比于Q355钢接头,MnNb钢对接接头抗拉强度稍低,但其热影响区冲击吸收能量明显更优,这主要是由于Q355钢粗晶区中存在细小的晶内组织和侧板条铁素体组织,而MnNb钢粗晶区具有大量针状铁素体与较小的原始奥氏体晶粒。MnNb钢接头的条件疲劳极限强度比Q355钢接头高57 MPa,其扩展区疲劳辉纹间距更小,裂纹扩展速度更慢,MnNb钢对接接头的疲劳性能显著优于Q355钢对接接头。展开更多
基金supported by Companhia Brasileira de Metalurgia e Mineração(CBMM)(CW2246174‐220221)the Technology Innovation Program(20010044,20012224)funded by Ministry of Trade,Industry&Energy(MOTIE,Korea)the Nano&Material Technology Development Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(RS‐2024‐00446825).
文摘Enhancing the energy density of all‐solid‐state batteries(ASSBs)with lithium metal anodes is crucial,but lithium dendrite‐induced short circuits limit fast‐charging capability.This study presents a high‐power ASSB employing a novel,robust solid electrolyte(SE)with exceptionally high stability at the lithium metal/SE interface,achieved via site‐specific Nb doping in the argyrodite structure.Pentavalent Nb incorporation into Wyckoff 48h sites enhances structural stability,as confirmed by neutron diffraction,X‐ray absorption spectroscopy,magic angle spinning nuclear magnetic resonance,and density functional theory calculations.While Nb doping slightly reduces ionic conductivity,it significantly improves interfacial stability,suppressing dendrite formation and enabling a full cell capable of charging in just 6 min(10‐C rate,16 mA cm^(-2)).This study highlights,for the first time,that electrochemical stability,rather than ionic conductivity,is key to achieving high‐power performance,advancing the commercialization of lithium metal‐based ASSBs.
文摘通过焊接热影响区最高硬度试验、斜Y形坡口焊接裂纹试验、典型对接接头性能评价试验及典型对接接头疲劳性能试验,结合金相显微镜(optical microscope,OM)和扫描电子显微镜(scanning electron microscope,SEM)两种表征手段,深入研究了新型低锰微铌钢(MnNb钢)与普通Q355钢(Q355钢)焊接性能差异及机理。结果表明,在不预热条件下,Q355钢表现出强烈的焊接淬硬倾向,而MnNb钢无淬硬倾向;MnNb钢和Q355钢均具备优良的防止焊接冷裂纹性能。相比于Q355钢接头,MnNb钢对接接头抗拉强度稍低,但其热影响区冲击吸收能量明显更优,这主要是由于Q355钢粗晶区中存在细小的晶内组织和侧板条铁素体组织,而MnNb钢粗晶区具有大量针状铁素体与较小的原始奥氏体晶粒。MnNb钢接头的条件疲劳极限强度比Q355钢接头高57 MPa,其扩展区疲劳辉纹间距更小,裂纹扩展速度更慢,MnNb钢对接接头的疲劳性能显著优于Q355钢对接接头。
