摘要
利用静电纺丝法制备了一种Na_(3.3)La_(0.3)Zr_(1.7)Si_(2)PO_(12)(NLZSP)纳米纤维,研究了前驱体溶液中聚合物含量和热处理温度对其微观形貌、结构和电化学性能的影响。在前驱体溶液中PVP含量为6%,800℃热处理4 h制备的NLZSP纳米纤维的纯度和结晶度高,纤维尺寸均匀且表面光滑。基于NLZSP纳米纤维制备的PEO(NaClO_(4))复合聚合物电解质(CPE)的室温离子电导率达3.3×10^(−4)S/cm,而PVDF-HFP(NaClO_(4))基CPE的室温离子电导率也达到了3.24×10^(−4)S/cm,活化能仅有0.24 eV,电化学稳定窗口可达5 V以上,显示出优异的电化学性能和稳定性。基于PVDF-HFP-NaClO_(4)-NLZSP纳米纤维的CPE、Na_(4)MnCr(PO_(4))3@C正极的固态钠金属电池在0.1 C时的首次放电比容量可达106.2 mAh/g,经倍率循环后容量保持率为94.8%;其在2 C下循环100次后的容量保持率也高达85.4%,显示出良好的循环稳定性。
Na_(3.3)La_(0.3)Zr_(1.7)Si_(2)PO_(12)(NLZSP)nanofibers were prepared by electrospinning,and the effects of polymer content in the precursor solution and heat treatment temperature on the microstructure,crystal structure and electrochemical properties of the nanofibers were studied.NLZSP nanofibers treated at 800℃for 4 h with a mass ratio of PVP of 6%in the precursor solution have high purity,high crystallinity,uniform fiber size and smooth surface.The ionic conductivity of PEO(NaClO_(4))composite polymer electrolyte(CPE)prepared based on NLZSP nanofibers reached 3.3×10^(−4)S/cm at room temperature,while the ionic conductivity of PVDF-HFP(NaClO_(4))based CPE reached 3.24×10^(−4)S/cm.The activation energy is only 0.24 eV,and the electrochemical stability window can reach more than 5 V,showing excellent electrochemical performance and stability.The initial discharge capacity of solid state sodium metal battery based PVDF-HFP-NaClO_(4)-NLZSP nanofibers CPE,Na_(4)MnCr(PO_(4))3@C cathode can reach 106.2 mAh/g at 0.1 C,and the capacity retention rate is 94.8%after rate cycle.Besides,the capacity retention rate was as high as 85.4%after 100 cycles at 2 C ratio,showing good cycle stability.
作者
张昌隆
王中跃
ZHANG Changlong;WANG Zhongyue(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing Jiangsu 210023,China)
出处
《电源技术》
北大核心
2025年第1期184-191,共8页
Chinese Journal of Power Sources
基金
国家自然科学基金(62075100)
南京邮电大学校级科研基金项目(NY221069,NY223070)。
