Ionic liquid-modified poly(propylene carbonate)-based electrolyte for all-solid-state lithium battery
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ORIGINAL PAPER
Ionic liquid-modified poly(propylene carbonate)-based electrolyte for all-solid-state lithium battery Changjiang Zhao 1,2 & Fei Ding 2 & Huan Li 3 & Shuoqing Zhang 1 & Xingjiang Liu 1,2 & Qiang Xu 1 Received: 27 March 2020 / Revised: 2 July 2020 / Accepted: 27 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Due to their high safety and excellent thermal stability, all-solid-state lithium batteries have been explored widely in the recent years, which are highly in demand for future energy storage. Herein, we propose a novel type of all-solid-state electrolyte, which is prepared by the modification of ionic liquid with poly(propylene carbonate) (PPC)-based polymer electrolyte. The selected ionic liquid, 1-vinylimidazole bis(trifluoromethanesulfonyl)imide (VIm-TFSI), acts as a plasticizer to be integrated into the PPC matrix. Such a VIm-TFSI-modified PPC-based electrolyte (PPC-25IL) has an ionic conductivity of 8.2 × 10−5 S cm−1 at room temperature. Moreover, it enables a highly reversible Li plating/stripping for Li anode, resulting in a dramatically improved rate and cyclic performance of LiFePO4-Li all-solid-state batteries. The VIm-TFSI plasticizer not only increases the ionic conductivity of PPC-based electrolyte but also improves the interfacial comparability of PPC-based electrolyte with the electrode. This work proposes a new strategy to develop all-solid-state lithium battery for real applications. Keywords Plasticizer . Ionic liquid . Poly(propylene carbonate) . Polymer electrolyte . All-solid-state battery
Introduction With the rapid development of economy and technology, the demand for the energy storage systems with high safety and high energy density has been rapidly enlarged [1]. Li-ion batteries with high energy density and long cycle life have been applied widely in many fields, such as the electric vehicles, portable electronic equipment, and large-scale charge stations [2]. However, the commercially available Li-ion batteries assembled Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03720-4) contains supplementary material, which is available to authorized users. * Fei Ding [email protected] * Qiang Xu [email protected] 1
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
2
National Key Laboratory of Science and Technology on Power Sources, Tianjin Institute of Power Sources, Tianjin 300384, People’s Republic of China
3
School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
with liquid electrolytes exhibit the poor thermal stability at high temperatures [3]. To address this issue, the all-solid-state lithium battery has been explored in the recent years. The solid-state electrolyte is a key part to develop high-performance all-solidstate lithium batteries [4]. The solid-state electrolytes for Li-ion batteries are divided into two categories: the inorganic solid electrolyte an
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