Polyanionic fluorophosphate NaVPO_(4)F is an ideal cathode material for high power sodium-ion batteries due to its high theoretical specific capacity and operating voltage.However,its practical application has been hi...Polyanionic fluorophosphate NaVPO_(4)F is an ideal cathode material for high power sodium-ion batteries due to its high theoretical specific capacity and operating voltage.However,its practical application has been hindered by low electronic conductivity and limited ionic mobility.To address this issue,this study successfully prepared the SiO_(4)4−incorporated NaV(PO_(4))_(1−x)(SiO)_(x)F cathode material.Research findings indicate that the incorporation of SiO_(4)^(4−)not only markedly reduces the material’s diffusion activation energy but also enhances the kinetics of Na+transport.Consequently,the modified NaV(PO_(4))0.9(SiO_(4))_(0.1)F cathode material exhibits a several orders of magnitude improvement in the Na+diffusion rate,leading to superior rate performance(achieving a specific capacity of 89.3 mA h g^(−1)at 30 C)and exceptional cycling stability(retaining capacity retention of 75.8%after 2000 cycles at 10 C).Furthermore,when integrated into a full battery with hard carbon,the battery exhibits exceptional reliability and stability for high-performance applications.展开更多
基金sponsored by the Youth Top notch Talent Project of Xinjiang Normal University(XJNUQB2024-11)the Doctoral Research Foundation of Xinjiang Normal University(XJNUBS2309)+2 种基金the College Student Innovation and Entrepreneurship Training Program Project of Xinjiang Normal University(S202410762007)the National Natural Science Foundation of China(22169020)the Xinjiang Key Research and Development Project(2021B01001-1,2022B01023-2).
文摘Polyanionic fluorophosphate NaVPO_(4)F is an ideal cathode material for high power sodium-ion batteries due to its high theoretical specific capacity and operating voltage.However,its practical application has been hindered by low electronic conductivity and limited ionic mobility.To address this issue,this study successfully prepared the SiO_(4)4−incorporated NaV(PO_(4))_(1−x)(SiO)_(x)F cathode material.Research findings indicate that the incorporation of SiO_(4)^(4−)not only markedly reduces the material’s diffusion activation energy but also enhances the kinetics of Na+transport.Consequently,the modified NaV(PO_(4))0.9(SiO_(4))_(0.1)F cathode material exhibits a several orders of magnitude improvement in the Na+diffusion rate,leading to superior rate performance(achieving a specific capacity of 89.3 mA h g^(−1)at 30 C)and exceptional cycling stability(retaining capacity retention of 75.8%after 2000 cycles at 10 C).Furthermore,when integrated into a full battery with hard carbon,the battery exhibits exceptional reliability and stability for high-performance applications.
