摘要
选用聚乙烯醇缩丁醛 (PVB)作主体高分子 ,以LiClO4为碱金属盐 ,加入PC增塑剂 ,制备了聚合物电解质。该方法简单实用 ,得到的膜为无定形高分子。当n(PVB)∶n(LiClO4)∶n(PC) =5∶1∶3(摩尔比 )时 ,电导率为 7.8× 10 - 4 S·cm- 1 。运用XRD、DSC、交流阻抗等测试手段 ,对影响聚合物电导率的因素作了初步探讨。电导率随着锂盐浓度的增加 ,呈现先增后减的趋势 ,当n(PVB)∶n(LiClO4) =5∶1时 ,电导率达到最大值。电导率同时也受到增塑剂的影响 ,当n(增塑剂 )∶n(锂盐 ) =3∶1时 ,电导率较高。电导率与温度的关系符合Arrhenius公式 ,聚合物电解质的活化能为 59.
A polymer electerolyte consisting of polyvinyl butyral (PVB) as host polymer and LiClO 4 as alkali salt as well as propylene carbonate (PC) as plasticizer was prepared by a simple and practical method. The conductivity of this amorphous polymer was 7.8×10 -4 S·cm -1 when n(PVB)∶n(LiClO 4)∶n(PC)=5∶1∶3(mole ratio). The factors that influence the conductivity of the polymer electrolyte was studied by means of XRD, DSC and AC impedance. The conductivity is the function of LiClO 4 concentration and PC concentration. It shows higher when n(PVB)∶n(LiClO 4)=5∶1 and n (PC)∶n (LiClO 4)=3∶1. The temperature dependence of the conductivity of polymer electrolyte is related to Arrhenius equation. Activation energy of the polymer electrolyte is 59.4 kJ/mol.
出处
《电源技术》
CAS
CSCD
北大核心
2000年第3期139-140,共2页
Chinese Journal of Power Sources
关键词
锂离子蓄电池
室温
固体电解质
聚合物
polymer electrolyte
amorphous polymer
conductivity
AC impedance
