A novel polyhedral oligomeric silsesquioxane based ionic liquids (POSS-ILs) polymer electrolytes for lithium ion batteries

作者：Shang, Dapeng; Fu, Jifang^*; Lu, Qi; Chen, Liya; Yin, Jintao; Dong, Xing; Xu, Yufeng; Jia, Rongrong; Yuan, Shuai^*; Chen, Yi; Deng, Wei

来源：Solid State Ionics, 2018, 319: 247-255.

DOI：10.1016/j.ssi.2018.01.050

• Solid polymer electrolytes
• Polyhedral oligomeric silsesquioxane
• POSS based ionic liquids (POSS-ILs)

A series of novel imidazolium-based polyhedral oligomeric silsesquioxane ionic liquids (POSS-ILs) have been successfully synthesized and used to develop new solid polymer electrolytes with high ionic conductivity and wide electrochemical windows. The POSS-ILs are added to the solid polymer electrolytes (SPEs) based on blend of polyethylene oxide (PEO), poly(vinylidene fluoride-hexafluoro propylene) (P(VDF-HFP)), propylene carbonate (PC) and lithium bis(trifluoromethanesulfonyl) imide (LiTESI) to alter the morphology, ionic conductivity, electrochemical windows properties. The results from scanning electron microscope (SEM), energy-dispersive x-ray spectrometry (EDXS) mapping and X-ray diffraction (XRD) indicate that POSS-ILs are uniformly distributed in the SPEs and form amorphous area by significantly inhibiting the crystallization of host polymer. The electrochemical studies indicate that the addition of POSS-ILs increases the ionic conductivity up to 3.9 x 10(-4) S cm(-1) at 22 degrees C and 1.5 x 10(-3) S cm(-1) at 62 degrees C. The electrochemical windows of POSS-ILs based SPEs are stable up to 5.0 V. As a result, the lithium-ion battery cell prepared using the POSS-ILs-SPE showed a good cycle performance and reversible capacity recovery behavior. These indicate POSS-ILs based SPEs would be good candidate to replace the conventional organic liquid electrolytes for lithium ion batteries.

• 出版日期2018-6
• 单位江苏大学; 上海应用技术大学; 上海大学