LLZTO复合PVDF-HFP基高盐聚合物固态电解质的制备及性能研究  

Preparation and Properties of LLZTO Composited PVDF-HFP-Based High-Salt-Concentration Polymer Solid-State Electrolyte

作　　者：刘典 马清扬 熊国垚 马宗仁 LIU Dian;MA Qingyang;XIONG Guoyao;MA Zongren(School of Chemistry,Chemical Engineering and Life Science,Wuhan University of Technology,Wuhan,Hubei 430070,China)

机构地区：[1]武汉理工大学化学化工与生命科学学院,湖北武汉430070

出　　处：《信息记录材料》2023年第4期7-10,共4页Information Recording Materials

基　　金：省级大学生创新创业训练项目(s202210497139)。

摘　　要：本研究以钽掺杂锂镧锆氧(LLZTO)、聚偏氟乙烯-六氟丙烯(PVDF-HFP)及双三氟甲烷磺酰亚胺锂(LiTFSI)等作为原料,使用刮涂法制得一种高盐聚合物固态电解质(LSE)。采用X射线衍射仪(XRD)、交流阻抗谱(EIS)、线性扫描伏安法(LSV)、恒压极化法等手段对高盐聚合物固态电解质进行表征和测试。研究发现,在室温条件下,LLZTO含量为20%(质量分数)的LSE_(0.20)离子电导率可达到4.5×10^(-4)S/cm,锂离子迁移数为0.48,电化学窗口可达到4.65 V。组装为LiFePO_(4)/LSE_(0.20)/Li全固态电池后,在室温条件下以0.2C充放电,电池的首次放电比容量为156.85 mAh/g。在50次充放电循环后,该电解质的放电比容量仅下降约3%,高达152.34 mAh/g,容量保持率可达到97%。Using Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO),polyvinylidene fluoride hexafluoron propylene(PVDF-HFP)and lithium bistrifluoromethane sulfonimide(LiTFSI),the researcher prepared a composited high-salt-concentration polymer solid-state electrolyte(LSE),which was characterized and tested using X-ray diffractometer(XRD),electricity impedance spectroscopy(EIS)and linear sweep voltammetry(LSV)by constant voltage polarization.It has been found that with a 20 wt.%of LLZTO,the ionic conductivity of LSE_(0.20) reaches 4.5×10^(-4) S/cm,the number of lithium-ion transference is 0.48 while the electrochemical window is found to be 4.65V.Furthermore,the assembled LiFePO_(4)/LSE_(0.20)/Li all-solid-state battery exhibits a specific discharge capacity of 156.85 mAh/g at 25℃and a current density of 0.2 C,while the capacity after 50 charge/discharge cycles remains high at 152.34 mAh/g,with only a 3%decrease and a retention of 97%.

关 键 词：锂离子电池 高盐聚合物固态电解质 活性填料 LLZTO PVDF-HFP 

分 类 号：TQ16[化学工程—高温制品工业]