静电纺丝法制备钠镁双离子掺杂磷酸钒锂及电化学性能研究  

PREPARATION OF SODIUM-MAGNESIUM BI-IONIC DOPED LITHIUM VANADIUM PHOSPHATE BY ELECTROSTATIC SPINNING AND ELECTROCHEMICAL PERFORMANCE

作　　者：李玉颖 白国梁 周学华 张涛 邓盛珏 LI Yuying;BAI Guoliang;ZHOU Xuehua;ZHANG Tao;DENG Shengjue(College of Chemistry and Chemical Engineering,Anqing Normal University,Anqing,Anhui 246013,China)

机构地区：[1]安庆师范大学化学化工学院,安徽安庆246013

出　　处：《井冈山大学学报(自然科学版)》2025年第2期27-34,共8页Journal of Jinggangshan University (Natural Science)

基　　金：国家自然科学青年基金项目(52302235);安徽省高等学校自然科学研究重大项目(2023AH040072)。

摘　　要：具有高理论比容量和出色离子电导率的磷酸钒锂,其电化学性能受限于电子电导率较低。为解决这一技术难题,本实验研究通过静电纺丝技术制备了含有钠和镁双离子共掺杂的Li_(2.97)Na_(0.03)V_(2-x)Mg_(x)(PO_(4))_(3)/C复合材料。通过XRD、SEM和FT-IR技术对这些材料进行了物理特性分析,并通过充放电测试、循环伏安(CV)和交流阻抗(EIS)实验进行电化学性能测试。研究结果发现,静电纺丝技术制备的材料展现出微纳米结构,纤维直径大约为200 nm。在0.1 C的倍率下,x=0.025时,放电比容量为122.8 mAh/g,并且实验在50次循环后,容量保持率达到97.4%,同时电荷转移阻抗降低至176.1Ω。The electrochemical performance of lithium vanadium phosphate,which has a high theoretical specific capacity and excellent ionic conductivity,is limited by its low electronic conductivity.To address this challenge,a series of Li_(2.97)Na_(0.03)V_(2-x)Mg_(x)(PO_(4))_(3)/C composites containing sodium and magnesium bi-ionic co-dopants are prepared by electrostatic spinning technique in this study.The materials are physically characterized by XRD,SEM and FT-IR techniques and electrochemical properties are tested by charge/discharge tests,cyclic voltammetry(CV)and alternating impedance(EIS)tests.The material prepared by the electrostatic spinning technique exhibits a micro-and nanostructure with a fiber diameter of about 200 nm.The specific capacity of discharge is 122.8 mAh/g at x=0.025 at a multiplicity of 0.1 C and the capacity retention is 97.4% after 50 cycles.At the same time the charge transfer impedance is reduced to 176.1Ω.

关 键 词：磷酸钒锂 静电纺丝法 离子掺杂 电化学 

分 类 号：TM912[电气工程—电力电子与电力传动]