Sulfide all-solid-state lithium batteries(SASSLBs)with a single-crystal nickel-rich layered oxide cathode(LiNix-CoyMn_(1-x-y)O_(2),x≥0.8)are highly desirable for advanced power batteries owing to their excellent ener...Sulfide all-solid-state lithium batteries(SASSLBs)with a single-crystal nickel-rich layered oxide cathode(LiNix-CoyMn_(1-x-y)O_(2),x≥0.8)are highly desirable for advanced power batteries owing to their excellent energy density and safety.Nevertheless,the cathode material's cracking issue and its severe interfacial problem with sulfide solid electrolytes have hindered the further development.This study proposes to employ surface modification engineering to produce B-NCM cathode materials coated with boride nanostructure stabilizer in situ by utilizing NCM encapsulated with residual lithium.This approach enhances the electrochemical performance of SASSLBs by effectively inhibiting electrochemical-mechanical degradation of the NCM cathode material on cycling and reducing deleterious side reactions with the solid sulfide electrolyte.The B-NCM/LPSCl/Gr SASSLBs demonstrate impressive cycling stability,retaining 84.19%of its capacity after 500 cycles at 0.2 C,which represents a 30.13%increase vs.NCM/LPSCl/Gr.It also exhibits a specific capacity of 170.4 mAh/g during its first discharge at 0.1 C.This work demonstrates an effective surface engineering strategy for enhancing capacity and cycle life,providing valuable insights into solving interfacial problems in SASSLBs.展开更多
采用共沉淀-高温固相法合成正极材料LiNi0．7 Mn0．3 O 2,利用 X 射线衍射分析（XRD）表征其结构、扫描电子显微镜（SEM）表征其形貌、X 射线光电子能谱（XPS）表征其价态,最终确定了该材料最佳烧成温度为820℃.研究表明,该温度下合成的...采用共沉淀-高温固相法合成正极材料LiNi0．7 Mn0．3 O 2,利用 X 射线衍射分析（XRD）表征其结构、扫描电子显微镜（SEM）表征其形貌、X 射线光电子能谱（XPS）表征其价态,最终确定了该材料最佳烧成温度为820℃.研究表明,该温度下合成的 LiNi0．7 Mn0．3 O 2具有典型的α-NaFeO 2型层状结构,颗粒形貌呈类球形且分布均匀；XPS 数据表明,LiNi0．7 Mn0．3 O 2中的 Ni 主要以＋3价形态存在,Mn 主要以＋4价形态存在.室温条件下以0．2 C 倍率在2．75~4．35 V 的电压范围内充放电,首次放电比容量高达188．9 mAh/g,70次循环后容量保持率为95．2％.展开更多
基金support from the National Natural Science Foundation of China(Grant No.52374407)is gratefully acknowledged.
文摘Sulfide all-solid-state lithium batteries(SASSLBs)with a single-crystal nickel-rich layered oxide cathode(LiNix-CoyMn_(1-x-y)O_(2),x≥0.8)are highly desirable for advanced power batteries owing to their excellent energy density and safety.Nevertheless,the cathode material's cracking issue and its severe interfacial problem with sulfide solid electrolytes have hindered the further development.This study proposes to employ surface modification engineering to produce B-NCM cathode materials coated with boride nanostructure stabilizer in situ by utilizing NCM encapsulated with residual lithium.This approach enhances the electrochemical performance of SASSLBs by effectively inhibiting electrochemical-mechanical degradation of the NCM cathode material on cycling and reducing deleterious side reactions with the solid sulfide electrolyte.The B-NCM/LPSCl/Gr SASSLBs demonstrate impressive cycling stability,retaining 84.19%of its capacity after 500 cycles at 0.2 C,which represents a 30.13%increase vs.NCM/LPSCl/Gr.It also exhibits a specific capacity of 170.4 mAh/g during its first discharge at 0.1 C.This work demonstrates an effective surface engineering strategy for enhancing capacity and cycle life,providing valuable insights into solving interfacial problems in SASSLBs.
文摘采用共沉淀-高温固相法合成正极材料LiNi0．7 Mn0．3 O 2,利用 X 射线衍射分析（XRD）表征其结构、扫描电子显微镜（SEM）表征其形貌、X 射线光电子能谱（XPS）表征其价态,最终确定了该材料最佳烧成温度为820℃.研究表明,该温度下合成的 LiNi0．7 Mn0．3 O 2具有典型的α-NaFeO 2型层状结构,颗粒形貌呈类球形且分布均匀；XPS 数据表明,LiNi0．7 Mn0．3 O 2中的 Ni 主要以＋3价形态存在,Mn 主要以＋4价形态存在.室温条件下以0．2 C 倍率在2．75~4．35 V 的电压范围内充放电,首次放电比容量高达188．9 mAh/g,70次循环后容量保持率为95．2％.
