Studying the Properties of PVdF-HFP Based Lithium Polymer Electrolytes Using non-ionic Surfactants as Plasticizers

Abstract

In this study, two different non-ionic surfactants have been evaluated as a plasticizer in lithium polymer electrolytes and compared with an organic carbonate-based plasticizer. To that end, non-ionic surfactants with different molecular weight and structure have been selected (Triton� X-100 and Brij�L23) and compared with organic carbonates (EC:DEC1:1) as plasticizers in lithium polymer electrolytes. The effect of the plasticizer content, salt content and surfactant characteristics on properties such as ionic conductivity, thermal stability and electrochemical stability of lithium polymer electrolytes has been studied. The results obtained show that the non-ionic surfactants studied as plasticizers (Triton� X-100 and Brij�L23) give lithium polymer electrolytes with higher thermal and electrochemical stability than organic carbonates, thus making them promising plasticizers for lithium polymer electrolytes, especially for high voltage lithium-ion batteries. Surfactant structure could influence the ionic conductivity of the polymer electrolytes, with the linear surfactants being more suitable for this application.

Electrospun LiFexMn1-xPO4/C Composite Nanofibers for Lithium-Ion Batteries

“…Redox potentials for LiMPO4 (M: Fe, Mn, Co, M +3 /M +2 vs. Li/Li +1 ), are ~3.4, 4.1 and 4.8 V, respectively. Although their theoretical capacities are close to each other (approximately 170 mA*h g -1 ), the redox reactions occur at different voltages, so theoretical energy density of LiMnPO4 and LiCoPO4 are 20 and 40 % higher than LiFePO4, respectively [1,2]. In addition, Fe and Mn are not toxic and they are relatively cheap because of their high abundance, so low-cost production is possible for commercial LIBs [3][4][5].…”

“…Lithium-ion batteries (LIBs) have become the common power sources in commercial applications such as portable electrical devices, electric vehicles and hybrid vehicles, parallel with the increased interest in lighter, thinner and smaller products [1]. Demand in high capacity and high voltage electrode materials is also increasing day by day for high energy applications.…”