High-Performance 3-D Fiber Network Composite Electrolyte Enabled with Li-Ion Conducting Nanofibers and Amorphous PEO-Based Cross-Linked Polymer for Ambient All-Solid-State Lithium-Metal Batteries

Solid electrolytes have gained attention recently for the development of next-generation Li-ion batteries since they can fun-damentally improve the battery stability and safety.Among various types of solid electrolytes,composite solid electrolytes(CSEs)exhibit both high ionic conductivity and excellent interfacial contact with the electrodes.Incorporating active nanofib-ers into the polymer matrix demonstrates an effective method to fabricate CSEs.However,current CSEs based on traditional poly(ethylene oxide)(PEO)polymer suffer from the poor ionic conductivity of PEO and agglomeration effect of inorganic fillers at high concentrations,which limit further improvements in Li+conductivity and electrochemical stability.Herein,we synthesize a novel PEO based cross-linked polymer(CLP)as the polymer matrix with naturally amorphous structure and high room-temperature ionic conductivity of 2.40×10^(−4)S cm^(−1).Li_(0.3)La_(0.557)TiO_(3)(LLTO)nanofibers are incorporated into the CLP matrix to form composite solid electrolytes,achieving enhanced ionic conductivity without showing filler agglomeration.The high content of Li-conductive nanofibers improves the mechanical strength,ensures the conductive network,and increases the total Li+conductivity to 3.31×10^(−4)S cm^(−1).The all-solid-state Li|LiFePO_(4)batteries with LLTO nanofiber-incorporated CSEs are able to deliver attractive specific capacity of 147 mAh g^(−1)at room temperature,and no evident dendrite is found at the anode/electrolyte interface after 100 cycles.

筛选非卤溶剂添加剂制备非富勒烯有机太阳能电池（英文）

虽然近年来有机太阳能电池的能量转换效率已经超过13%,但是加工高效率有机太阳能电池的溶剂大多数是含卤溶剂,这些溶剂体系阻碍了有机太阳能电池的进一步发展.因此,探索使用绿色溶剂制备高效率电池具有重要意义.本文在非卤溶剂邻二甲苯作为主溶剂的前提下,通过筛选不同非卤溶剂作为添加剂制备高效有机太阳能电池,在PBDB-T:IT-M共混材料体系中,取得了11.6%的能量转换效率,该效率是使用非卤溶剂加工有机太阳能电池的最高效率之一.我们通过一系列形貌测试将共混薄膜形貌的相区尺寸,相区纯度以及结晶性等重要形貌参数与器件性能进行关联,这对非富勒烯有机太阳能电池的性能优化具有指导意义.本研究表明,通过细致筛选非卤溶剂添加剂调节共混薄膜的形貌,从而可以获得高性能的有机太阳能电池.