Mechanism for improvement in mechanical and thermal stability in dispersed phase polymer composites

Abstract

We report substantial improvement in the mechanical stability, thermal stability, and conductivity of four series of ion-conducting dispersed phase composite polymer electrolytes (CPEs). Tensile strength of filler-dispersed composite films was ≥2 MPa in contrast to~1 MPa for undispersed polymer-salt complex. Similarly, elongation at break has shown an increase by~200-300% in the composite films. Filler-induced enhancement in thermal and mechanical stability has clearly been noticed. The improvement in the mechanical stability is also accompanied by a corresponding increase in electrical conductivity in the composite films by 1-2 orders of magnitude at lower (2 wt.%) of the filler loading. A mechanism for the improvement in mechanical stability has been proposed. The strength of the mechanism lies in evidenced polymerfiller interaction among the composite components. Suppression of thermal degradation and increased mechanical strength of the CPEs on filler addition has been explained on the basis of transient cross-linking of the polymeric segments and filler-polymer bridging effect.

Lithium dendrite growth mechanisms in polymer electrolytes and prevention strategies

“…Such modification of the yield strength of PEO-based polymers can be accomplished by the usage of several additives [48,64]. However, for successful implementation of these PEObased polymer composites as lithium-ion battery electrolytes, they must possess sufficiently large magnitudes of conductivity, diffusivity and transference number.…”

One-Pot Green Synthesis of a PEO/TCPP/LiClO4 Solid Polymer Electrolyte with Improvement of Ion Transport

“…It can be ascribed to the homogeneous dispersion of the lithium salts and fillers within the PEO polymer matrix, which can effectively resist heat expansion to the polymer matrix and result in slowing down the thermal degradation of the CPE films. 52 Interestingly, the TCPP-based CPE samples are thermally stable up to above 300 °C in which the decomposition temperatures of 299, 311, 336, and 329 °C for TCPP-02, TCPP-05, TCPP-08, and TCPP-10 CPE, respectively, were observed as the weight loss around 10%. The enhanced thermal stability of the TCPP-based CPE films ascribed to the better polymer−filler interaction of the present work is high enough for designing lithium-ion cells capable of stable operation for safety concerns.…”

“…Compared with the pure PEO system, a significant enhancement in the thermal stability for the LiClO 4 -added PEO polymers with and without TCPP fillers was obtained. It can be ascribed to the homogeneous dispersion of the lithium salts and fillers within the PEO polymer matrix, which can effectively resist heat expansion to the polymer matrix and result in slowing down the thermal degradation of the CPE films . Interestingly, the TCPP-based CPE samples are thermally stable up to above 300 °C in which the decomposition temperatures of 299, 311, 336, and 329 °C for TCPP-02, TCPP-05, TCPP-08, and TCPP-10 CPE, respectively, were observed as the weight loss around 10%.…”

Assessment on the mechanical, structural, and thermal attributes of green graphene‐based water soluble polymer electrolyte composites

“…F2 suggests that the addition of very low amount of salt enhances the elongation‐at‐break greatly. At higher concentration of filler, there may be a possibility of bridging effect between neighboring polymeric chains, owing to filler particles, hence causing an enhancement in brittleness of the polymeric system, which results in a decrease in the elongation‐at‐break . The result of Na 2 SO 4 impregnation on the Young's modulus of PEO/Na 2 SO 4 composites is publicized by Figure .…”