新型PEO/LPOS复合聚合物电解质的制备与性能研究  

Preparation and performance of PEO/LPOS composite polymer electrolyte

作　　者：赵嫣然[1] 陈少杰[1] 陶益成 陈晓添 姚霞银[1] 许晓雄[1] 

机构地区：[1]中国科学院宁波材料技术与工程研究所,浙江宁波315201

出　　处：《储能科学与技术》2016年第5期730-734,共5页Energy Storage Science and Technology

基　　金：中科院战略性先导专项(A类)(DA09010201);宁波市自然科学基金项目(2015A610238)

摘　　要：将具有较高电导率和稳定性的硫化物电解质LPOS引入PEO基聚合物中,制备一种新型PEO/LPOS复合聚合物电解质。研究结果表明,1%LPOS的添加能显著改善PEO基聚合物电解质的电导率、锂离子迁移数和电化学稳定性。与纯PEO基电解质相比,新制备的复合聚合物电解质PEO18-Li TFSI-1%LPOS室温电导率由6.18×10^(-6) S/cm提高至1.60×10^(-5) S/cm,提高了158%。80℃表现出最佳电导率为1.08×10^(-3) S/cm,电化学窗口提高至4.7 V,同时具有非常良好的对锂稳定性。以新型复合电解质组装的Li Fe PO4/Li全固态锂电池表现出良好的循环稳定性,在60℃1 C下循环50周后放电比容量仍维持在105 m A·h/g以上。A novel free-standing composite electrolyte membranes with high ionic conductivity and good electrochemistry stability is papered through incorporation of sulfide electrolyte 70Li2S-29PESs-1P2O5 （LPOS） into polyethylene oxide （PEO） matrix. The LPOS particles, acting as active fillers incorporation into the PEO matrix, have a positive effect on the ionic conductivity, lithium ion transference number and electrochemical stability. The lithium ion conductivities of as-prepared composite membranes are evaluated, and the optimal composite membrane incorporating 1% LPOS exhibits an ionic conductivity of 1.60×10^-5 S/cm at room temperature and a maximum ionic conductivity of 1.08×10^-3 S/cm at 80℃ and an electrochemical window of 4.7 V. And the LiFePOn/Li battery fabricated with this new composite electrolyte membrane exhibits fascinating cycle performance with high capacity retention. After 50 cycles, the discharge capacity of cell LiFePOn/PEO18-LiTFSI-l%LPOS/Li is 105 mA.h/g at 1 C rate at 60 ~C. It is demonstrated that this new composite electrolyte membrane should be a promising electrolyte applied in solid state batteries based on lithium metal electrode.

关 键 词：固体聚合物电解质 锂快离子导体 复合 全固态锂电池 

分 类 号：TM911[电气工程—电力电子与电力传动]