Effects of lithium perchlorate on the nucleation and crystallization of poly(ethylene oxide) and poly(ε-caprolactone) in the poly(ethylene oxide)–poly(ε-caprolactone)–lithium perchlorate ternary blend

Huo, Hong; Yang, Yujun; Zhao, Xiuxiu

doi:10.1039/c3ce41715h

Cited by 6 publications

(1 citation statement)

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“…Recently, inspired by the high anodic stability of the cyclic carbonates used in liquid electrolytes, carbonyl-containing polymers (e.g., polycarbonates and polyesters) have been widely explored in this area, owing to their improved selectivity in lithium ion transport and better anodic stability against high-voltage (>4 V vs Li/Li + ) materials. , Although various carbonyl-based SPEs have been prepared and characterized as electrolytes for rechargeable LMBs, the origin and mechanism behind ionic transport behavior of carbonyl-based SPEs remain to be elucidated. − Therefore, in this work, we report the fundamental physicochemical properties and ionic conductivity mechanism of several SPEs using a blend matrix of polyether (PEO) and polyester [poly(ε-caprolactone), PCL], in hope of shedding light on the rational design of robust SPEs which are essential for accessing high-performance rechargeable LMBs. Differing from previous work on other PEO-based blended electrolytes or simple polymer blends and without salts, − ternary electrolyte systems comprising lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), PEO, and PCL are selected on the basis of the following reasons: (1) LiTFSI owns much better chemical and thermal stabilities compared to the salts studied in previous work (e.g., LiClO 4 /PEO–PCL), and it has been successfully employed as a conducting salt for commercial lithium metal polymer batteries produced by the Bollore group; (2) PCL has been widely used in the domain of biodegradable polymers, and its fundamental properties (e.g., phase transition, thermal stability, biodegradability, etc.) have been well characterized, which is beneficial for investigating the effect of PCL on a ternary electrolyte system; (3) PCL is commercially available with good reproducibility obtained from a scalable synthesis route, which could simplify the parameters while examining the structure–property relations of the blended SPEs.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Ionic Transport of Solid Polymer Electrolytes in Polyether and Polyester Blends

et al. 2020

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Solid polymer electrolytes (SPEs) have been playing a crucial role in the development of a high-performance solid-state lithium metal battery. The safety and the easy tailoring of the polymers designate these materials as promising candidates to be implemented as electrolytes. Poly(ethylene oxide) (PEO) has been widely employed during the past four decades, but its inferior electrochemical stability against high-voltage cathode active materials strongly urges the search for alternative polymers. In recent years, several carbonyl-containing polymers have arisen as possible replacements for PEO, with poly(ε-caprolactone) (PCL) being one of the most representative. In this work, we combine molecular dynamics simulations and a range of experimental measurements to gain in-depth insights into the ionic transport in polyester-based SPEs. Specifically, the physicochemical properties and morphological behaviors of the blend SPEs comprising PEO and PCL including the two end members are comprehensively investigated. The results reveal that the preferential coordination between Li + cation and ethylene oxide units and partial phase separation between PEO and PCL control the ionic transport in PEO and PCL blends. The present study is believed to inspire novel design strategies for improving the properties of SPEs and batteries made from them.

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