原位复合法制备TiO2 / ( PEO)8LiClO4 聚合物电解质

以聚氧化乙烯/ 高氯酸锂络合物( ( PEO)₈LiClO₄ ) 为基体, 通过钛酸四丁酯的水解缩合反应在基体中原位生成TiO₂粒子, 制备了TiO₂ / ( PEO)₈LiClO₄复合聚合物电解质膜。采用SEM、DSC 和交流阻抗方法分别研究了电解质膜的表面形貌、热性能和离子导电性能。结果表明, 原位生成的TiO₂ 粒子均匀分散于PEO 基体中。复合TiO₂后电解质膜的玻璃化转变温度和结晶度降低。电解质膜的离子导电行为满足Arrhenius 方程, 并在5 %TiO₂含量时体系的电导率出现最大值5. 5 ×10 -5 S/ cm (20 ℃) 。以此膜为电解质组装的全固态聚合物锂电池放电时电压平稳, 20 次循环后放电容量保持在107 mAh/ g。 

TiO2 /( PEO)8LiClO4 composite polymer electrolytes prepared by in-situ method

TiO2 / ( PEO)8LiClO4 composite polymer elect rolyte films were prepared by a solution cast method. TiO2particles were in2si tu formed in ( PEO)8LiClO4 mat rix by simply mixing PEO , LiClO4 and tet rabutyl titanate andthen drying. The morphology , thermal performance and conductivity of the films were studied using SEM , DSC andelect rical impedance spect roscopy , respectively. The result s show that the in-situ formed TiO2 particles are founduniformly dispersed in PEO mat rix. The glass t ransition temperature and crystallinity of the films are lowered due tothe presence of TiO2 . The conductive behaviour of the films follows an Arrhenius type relation. A maximal conductivity 5. 5 ×10 - 5 S/ cm at 20 ℃of the TiO2 / ( PEO)8LiClO4 film was obtained at 5 % mass f raction of TiO2 . Thepolymer lithium ion battery with the elect rolyte films exhibit s stable discharge voltage. The discharge specificcapacity could still retain 107 mAh/ g af ter 20 cycles.