Application of the imidazolium ionic liquid based nano-particle decorated gel polymer electrolyte for high safety lithium ion battery

Lithium‐Ion Battery Separators for Ionic‐Liquid Electrolytes: A Review

“…The thermal and mechanical properties of the coated separators were studied before being wetted with the electrolyte. The presence of SiO 2 decreased the separator thermal dimensional stability more than Al 2 O 3 , but the separator containing equal parts SiO 2 and Al 2 O 3 showed the lowest shrinkage after being exposed to 150 °C for 60 min . Similarly, the mechanical fracture strength is highest for the separator containing equal parts SiO 2 and Al 2 O 3 , 160 MPa for the coated separator compared to 138 MPa for the Celgard PE separator.…”

“…When wet with 0.5 m LiTFSI EMITFSI IL electrolyte the coated separators had ionic conductivities in the order of 1 mS cm −1 , and the highest ionic conductivity (3.2 mS cm −1 ) was observed in the separator containing equal parts SiO 2 and Al 2 O 3 . The authors attribute the enhanced ionic conductivity to strong interaction between the ceramic particles and TFSI − resulting in more free lithium ions and therefore a higher lithium transference number.…”

“…EIS was used to investigate the interfacial stability of the coated separators and IL electrolyte with metallic lithium. The coated separator containing equal parts SiO 2 and Al 2 O 3 showed the lowest variation in interfacial resistance during storage which the authors attribute to superior compatibility and SEI film forming properties . It was suggested that the presence of ceramic particles with high surface area in the separator was better able to retain electrolyte and side reaction products in the separator pores, resulting in a reduction of material available for reaction at the SEI film and therefore increasing SEI stability.…”

“…A PMMA–AN–EA‐coated commercial PE separator was investigated with and without ceramic nanoparticles for use with 0.5 m LiTFSI in N ‐ethyl‐ N ‐methyl‐imidazolium bis(trifluoromethanesolfonyl)imide (EMITFSI) IL electrolyte containing vinylene carbonate (VC) interfacial film forming additive . The separator porosity, thermal stability, mechanical stability, ionic conductivity, electrochemical stability, lithium SEI characteristics, LFP | Li cell capacity, and morphology after cycling were reported with LiTFSI in EMITFSI IL electrolyte.…”

“…Also, the separator performance in a cell can be characterized through cycling: 1) in a symmetrical lithium cell to determine lithium plating/stripping characteristics of the separator with the electrolyte, and 2) in a cell with the intended electrode materials for the cell application to determine the rate performance and cycle life characteristics. Analysis of separator interactions with other cell materials before and after cycling can also help characterize material compatibility, for example, observing physical separator surface and structural changes with SEM and analyzing chemical structure changes with Raman spectroscopy and FTIR …”