含硅氢键聚二硅氧烷/聚醚共混聚合物电解质 II. PSEMH对PEO结晶性能及离子电导率的影响

通过Raman，DSC和XRD等方法对PEO-PSEMH-LiClO4全固态共混聚合物电解质进行了研究，结果表明PSEMH能够显著地降低PEO-LiClO4电解质体系的PEO的结晶性和玻璃化转变温度，同时PSEMH分子的二硅醚链节中氧原子与Li+间具有配位作用，从而大幅提高x%PEO-y%PSEMH-LiClO4电解质在低温区的离子电导率。而当PSEMH交联硫化之后，虽然降低了PEO的结晶度和Tg，但是由于PSEMH的交联网络限制了聚合物链段的运动性，使得电解质的离子电导率在低温区高于100%PEO-LiClO4(约为12倍)，而在高温区则低于100%PEO-LiClO4，充分证明了PSEMH对电解质的离子电导率的具有显著的贡献作用。

Polysilaether Containing Moiety Si-H Bonds in the Side Chain/PEO Composite Polymer Electrolyte II. Effects of PSEMH on the crystallization properties of PEO and ionic conductivity of PEO-PSEMH-LiClO4

Interactions between polysilaether containing moiety Si-H bonds in the side chain (PSEMH) chains and polyethylene oxide (PEO) in PEO-PSEMH-UClO_4 solid-state composite polymer electrolytes were studied by Raman, DSC and XRD techniques. The experimental result shows that PSEMH can inhibit the crystalline nature of PEO and reduce its glass transition point at the same time, then enhancing the ionic conductivity of the composite polymer electrolytes largely at lower temperature. In addition, the oxygen atoms of SiSiO chain in PSEMH have coordination with Li~+. After PSEMH was crosslinked, the crystalline nature of PEO was inhibited and its glass transition point also reduced. The ionic conductivity of the composite polymer electrolytes was higher than that of 100% PEO-LiClO_4 (about 12 times) at lower temperature, however, at high temperature the ionic conductivity of 100% PEO-UClO_4 was higher than that of composite polymer electrolytes, proving that the polymer PSEMH has a significant contribution to the ionic conductivity of composite polymer electrolyte.