Effect of interaction in allophane/PEO/LiClO₄ composite solid polymer electrolyte on crystallization of PEO

• Main Authors: WU Hao, QIU Jin, CHEN Wei-xing, YANG Jing-jing, MA Ai-jie, CAI Li-fan
• Format: Article
• Language: zho
• Published: Journal of Materials Engineering 2021-01-01
• Series: Journal of Materials Engineering
• Subjects: allophane; polyethylene oxide; crystallization; composite solid polymer electrolyte
• Online Access: http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000174
• ISSN: 1001-4381; 1001-4381

In order to solve the safety problems in the lithium ion batteries used nowadays,the researchers were increasingly attracted by the solid electrolytes. Allophane was prepared from Na₂SiO₃ and AlCl₃·6H₂O by sol-gel method. By mixing the allophane and the polyethylene oxide/lithium perchlorate(PEO/LiClO₄)with the solution blending method,the composite solid polymer electrolyte was obtained. X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR),differential scanning calorimetry(DSC),transmission electron microscope(TEM),scanning electron microscope(SEM)and optical microscopy(OM)were used to characterize the microstructure and morphology of the samples. The results show that the noncovalent bonding interactions(complexation,hydrogen bonding,and Lewis acid-base interaction)among allophane,LiClO₄ and PEO significantly inhibit the crystallization of PEO. The crystallinity of PEO decreases and then increases with the increase of allophone content. Moreover,the crystallinity of PEO decrease with the increase of LiClO₄ content. When EO/Li⁺ molar ratio is 10:1 and the content of allophane is 5%(mass fraction),the crystallinity of PEO in the solid polymer electrolyte is only 4.12%.