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Flexible Composite Solid Electrolyte Facilitating Highly Stable “Soft Contacting” Li–Electrolyte Interface for Solid State Lithium‐Ion Batteries
Author(s) -
Yang Luyi,
Wang Zijian,
Feng Yancong,
Tan Rui,
Zuo Yunxing,
Gao Rongtan,
Zhao Yan,
Han Lei,
Wang Ziqi,
Pan Feng
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201701437
Subject(s) - materials science , electrolyte , crystallinity , chemical engineering , ionic conductivity , lithium (medication) , anode , composite number , membrane , electrochemical window , fast ion conductor , inorganic chemistry , composite material , electrode , chemistry , medicine , engineering , endocrinology , biochemistry
A flexible composite solid electrolyte membrane consisting of inorganic solid particles (Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 ), polyethylene oxide (PEO), and boronized polyethylene glycol (BPEG) is prepared and investigated. This membrane exhibits good stability against lithium dendrite, which can be attributed to its well‐designed combination components: the compact inorganic lithium ion conducting layer provides the membrane with good mechanical strength and physically barricades the free growth of lithium dendrite; while the addition of planar BPEG oligomers not only disorganizes the crystallinity of the PEO domain, leading to good ionic conductivity, but also facilitates a “soft contact” between interfaces, which not only chemically enables homogeneous lithium plating/stripping on the lithium metal anode, but also reduces the polarization effects. In addition, by employing this membrane to a LiFePO 4 /Li cell and testing its galvanostatic cycling performances at 60 °C, capacities of 158.2 and 94.2 mA h g −1 are delivered at 0.1 C and 2 C, respectively.