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.
Highlights
It is worth noting that the limited energy density of lithium-ion batteries (LIB) is strongly associated with the organic liquid electrolyte, as well as potential safety risks
This paper aims to study the effect of two different non-ionic surfactants (Triton® X100 and Brij®L23) as a plasticizer on different properties of PVdF-HFP contains amorphous domains (HFP) based-polymer electrolytes
Properties of the plasticizers studied Carbonates are the most extensively used plasticizers in polymer electrolytes due to their high solubility of lithium salts and the final high ionic conductivity achieved in the electrolyte
Summary
It is worth noting that the limited energy density of lithium-ion batteries (LIB) is strongly associated with the organic liquid electrolyte, as well as potential safety risks To address these limitations two strategies are needed: the use of high energy voltage cathode materials and the replacement of the organic liquid electrolyte by a non-flammable, safe and highly reliable electrolyte [1,2]. The fact that conventional carbonate solvent-based electrolytes exhibit an inferior anodic stability of less than 4.3 V vs Li/Li+ and the mitigation of the undesirable oxidative decomposition of electrolytes become the decisive factors restricting electrode capacity of high-voltage LIBs [3]. Since Armand first proposed the first PEO/Li+ polymer electrolyte system (~10−5 S cm−1 at 40–60°C) for lithium batteries in 1978 [5], polymer electrolytes have attracted widespread attention due to their superior features such as free-standing, shape versatility, security, flexibility, lightweight, and reliability
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