改性无机微粒掺杂的固体聚合物电解质

Modified inorganic particle adulterated solid polymer electrolyte

为了提高锂离子电池固体聚合物电解质的电导率,用硫酸对纳米SiO2和TiO2进行表面改性,并加入到PEO基体中.采用溶液铸膜法制备出无机微粒-LiClO4-PEO全固态聚合物电解质(SPE).运用数字显微镜、交流阻抗和拉伸测试对电解质膜的性能进行了表征,研究了无机微粒中w(酸)对电解质电导率的影响.结果表明,SiO2微粒中w(酸)对电导率影响不大;TiO2微粒中的w(酸)与电导率成正比.当w(酸)=8%时,电解质的室温电导率可达1.83×10-6S/cm.改性后的TiO2微粒,可进一步提高固体聚合物电解质的电导率.

In order to improve the electrical conductivity of solid polymer electrolyte in lithium battery, nano SiO2 and TiO2 were modified using sulfuric acid, and added to the PEO matrix. The inorganic particles-LiC1On-PEO composite solid polymer electrolyte （SPE） was prepared by the solution casting method. The performance of the electrolyte was characterized by digital microscope, electrochemical impedance spectrum and tensile tests. The influence of inorganic particles with different acid contents on the electrical conductivity of the SPE was studied. The results show that the acid content in SiO2 particles has little effect on the electrical conductivity while the acid content in TiO2 particles is proportional to the electrical conductivity. When the acid content is 8 %, the electrical conductivity of the electrolyte at room temperature reaches 1.83 × 10^-6 S/cm. The modified TiO2 particles can further improve the electrical conductivity of the solid polymer electrolyte.