中国科学院重庆绿色智能技术研究院机构知识库

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	Achieving High Performance of Lithium Metal Batteries by Improving the Interfacial Compatibility between Organic and Inorganic Electrolytes Using a Lithium Single-Ion Polymer
	Ma, Xiang1; Liu, Mian1; Qi, Yujia2; Li, Xinyuan2; Wang, Fei1; Liu, Hongmei1; Wu, Qingping3; Guan, Xiang; Xu, Jun1
	2022-11-03
摘要	Composite solid electrolytes (CSEs) containing polymer electrolytes and inorganic particulate fillers have the potential to attain excellent electrochemical performance and good interfacial contact with Li metal. Nevertheless, the performance of CSEs is still constrained by the low Li+ transference number (tLi+) and problems at the polymer- ceramic interface. In this study, we present a CSE with high tLi+ and promising comprehensive performance, in which the surface of LLZTO micron particles was grafted by lithium (4-styrenesulfonyl) (trifluor-omethanesulfonyl) imide (LiSTFSI). The existence of LiSTFSI on the surface of modified particles was confirmed by FTIR spectroscopy and X-ray photoelectron spectroscopy measurements. These surface-modified particles were uniformly dispersed in the poly-(vinylidenefluoride-hexafluoropropylene) (PVDF-HFP) matrix for the improved interfacial compatibility, by which CSEs (PFL@LCSE) were formed. Li@LLZTO particles were found by X-ray diffraction spectra to decrease the crystallinity of PFL@LCSE and to increase the ionic conductivity. Simultaneously, LiSTFSI on the surface of Li@LLZTO was able to restrict the migration of anions and improve the concentration polarization phenomenon inside the battery. PFL@LCSE exhibits high ionic conductivity (1.40 x 10-4 S center dot cm-1 at 30 degrees C), high tLi+ (0.59 at 60 degrees C), good mechanical strength, and remarkable ability to inhibit Li dendrite growth. Li/Li symmetrical and LFP/Li full batteries were assembled and demonstrated good cycling performance. It indicates that improving the interfacial compatibility between organic and inorganic electrolytes is a promising strategy for enhancing the performance of CSEs.
关键词	composite solid electrolyte interfacial compatibility garnet modification lithium single-ion polymer lithium dendrite
DOI	10.1021/acsaem.2c02718
发表期刊	ACS APPLIED ENERGY MATERIALS
ISSN	2574-0962
页码	10
通讯作者	Xu, Jun(xujun@ecust.edu.cn)
收录类别	SCI
WOS记录号	WOS:000880843300001
语种	英语