LiCl-KCl共晶熔盐为乏燃料干法后处理中电解精炼过程常用的电解质,其对结构材料的腐蚀主要受熔盐中杂质的影响,通过熔盐纯化降低其腐蚀性是解决干法后处理材料腐蚀问题的重要手段之一。研究中使用电解法对LiCl-KCl盐进行纯化,通过循环...LiCl-KCl共晶熔盐为乏燃料干法后处理中电解精炼过程常用的电解质,其对结构材料的腐蚀主要受熔盐中杂质的影响,通过熔盐纯化降低其腐蚀性是解决干法后处理材料腐蚀问题的重要手段之一。研究中使用电解法对LiCl-KCl盐进行纯化,通过循环伏安电化学方法监测纯化过程,并使用电感耦合原子发射质谱(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)测量LiCl-KCl盐纯化前后杂质元素含量。同时在773K、氩气环境下开展Inconel 600在纯化前后LiCl-KCl熔盐中500h的浸泡腐蚀实验,使用扫描电镜(Scanning Electron Microscopy,SEM)、X射线衍射仪(X-ray Diffractometer,XRD)对腐蚀后试样进行表征。结果显示:电解纯化对LiCl-KCl盐内金属离子杂质的去除效果显著,有效减缓了高温熔盐对Inconel 600的腐蚀。展开更多
Inadequate interfacial contact between lithium and solid-state electrolytes(SSEs)leads to elevated impedance and the growth of lithium dendrites,presenting significant obstacles to the practical viability of solid-sta...Inadequate interfacial contact between lithium and solid-state electrolytes(SSEs)leads to elevated impedance and the growth of lithium dendrites,presenting significant obstacles to the practical viability of solid-state batteries(SSBs).To ameliorate interfacial contact,optimizing the surface treatment of SSEs has been widely adopted.However,the formation of LiCl through acid treatment,an equally crucial factor impacting SSB performance,has received limited attention,leaving its underlying mechanism unclear.Our study aims to shed light on SSE characteristics following LiCl formation and the removal of Li_(2)CO_(3) through acid treatment.We seek to establish quantifiable links between SSE surface structure and SSB performance,focusing on interfacial resistance,current distribution,critical current density(CCD),and lithium deposition.The formation of LiCl,occurring as Li_(2)CO_(3) is removed through acid treatment,effectively mitigates lithium dendrite formation on SSE surfaces.This action inhibits electron injection and reduces the diffusion rate of Li atoms.Simultaneously,acid treatment transforms the SSE surface into a lithiophilic state by eliminating surface Li_(2)CO_(3).Consequently,the interfacial resistance between lithium and SSEs substantially decreases from 487.67 to 35.99Ωcm^(2) at 25°C.This leads to a notably high CCD of 1.3 mA cm^(-2) and a significantly extended cycle life of 1,000 h.Furthermore,in full SSBs incorporating LiCoO_(2)cathodes and acid-treated garnet SSEs,we observe exceptional cyclability and rate capability.Our findings highlight that acid treatment not only establishes a fundamental relationship between SSE surfaces and battery performance but also offers an effective strategy for addressing interfacial challenges in SSBs.展开更多
文摘LiCl-KCl共晶熔盐为乏燃料干法后处理中电解精炼过程常用的电解质,其对结构材料的腐蚀主要受熔盐中杂质的影响,通过熔盐纯化降低其腐蚀性是解决干法后处理材料腐蚀问题的重要手段之一。研究中使用电解法对LiCl-KCl盐进行纯化,通过循环伏安电化学方法监测纯化过程,并使用电感耦合原子发射质谱(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)测量LiCl-KCl盐纯化前后杂质元素含量。同时在773K、氩气环境下开展Inconel 600在纯化前后LiCl-KCl熔盐中500h的浸泡腐蚀实验,使用扫描电镜(Scanning Electron Microscopy,SEM)、X射线衍射仪(X-ray Diffractometer,XRD)对腐蚀后试样进行表征。结果显示:电解纯化对LiCl-KCl盐内金属离子杂质的去除效果显著,有效减缓了高温熔盐对Inconel 600的腐蚀。
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.2021R1F1A1063093)the Fundamental R&D program through the Korea Institute of Ceramic Engineering&Technology(KICET)(grant NTIS no.1415187241,KPB23003)。
文摘Inadequate interfacial contact between lithium and solid-state electrolytes(SSEs)leads to elevated impedance and the growth of lithium dendrites,presenting significant obstacles to the practical viability of solid-state batteries(SSBs).To ameliorate interfacial contact,optimizing the surface treatment of SSEs has been widely adopted.However,the formation of LiCl through acid treatment,an equally crucial factor impacting SSB performance,has received limited attention,leaving its underlying mechanism unclear.Our study aims to shed light on SSE characteristics following LiCl formation and the removal of Li_(2)CO_(3) through acid treatment.We seek to establish quantifiable links between SSE surface structure and SSB performance,focusing on interfacial resistance,current distribution,critical current density(CCD),and lithium deposition.The formation of LiCl,occurring as Li_(2)CO_(3) is removed through acid treatment,effectively mitigates lithium dendrite formation on SSE surfaces.This action inhibits electron injection and reduces the diffusion rate of Li atoms.Simultaneously,acid treatment transforms the SSE surface into a lithiophilic state by eliminating surface Li_(2)CO_(3).Consequently,the interfacial resistance between lithium and SSEs substantially decreases from 487.67 to 35.99Ωcm^(2) at 25°C.This leads to a notably high CCD of 1.3 mA cm^(-2) and a significantly extended cycle life of 1,000 h.Furthermore,in full SSBs incorporating LiCoO_(2)cathodes and acid-treated garnet SSEs,we observe exceptional cyclability and rate capability.Our findings highlight that acid treatment not only establishes a fundamental relationship between SSE surfaces and battery performance but also offers an effective strategy for addressing interfacial challenges in SSBs.
