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Facilitating Interfacial Stability Via Bilayer Heterostructure Solid Electrolyte Toward High‐energy, Safe and Adaptable Lithium Batteries
Author(s) -
Sun Jianqi,
Yao Xiangming,
Li Yaogang,
Zhang Qinghong,
Hou Chengyi,
Shi Qiuwei,
Wang Hongzhi
Publication year - 2020
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.202000709
Subject(s) - materials science , electrolyte , hexafluoropropylene , chemical engineering , ionic conductivity , conductivity , polyvinylidene fluoride , oxide , fast ion conductor , nanocomposite , quasi solid , nanotechnology , composite material , electrode , polymer , metallurgy , chemistry , engineering , tetrafluoroethylene , dye sensitized solar cell , copolymer
Solid‐state electrolytes are widely anticipated to enable the revival of high energy density and safe metallic Li batteries, however, their lower ionic conductivity at room temperature, stiff interfacial contact, and severe polarization during cycling continue to pose challenges in practical applications. Herein, a dual‐composite concept is applied to the design of a bilayer heterostructure solid electrolyte composed of Li + conductive garnet nanowires (Li 6.75 La 3 Zr 1.75 Nb 0.25 O 12 )/polyvinylidene fluoride‐ co ‐hexafluoropropylene (PVDF‐HFP) as a tough matrix and modified metal organic framework particles/polyethylene oxide/PVDF‐HFP as an interfacial gel. The integral ionic conductivity of the solid electrolyte reaches 2.0 × 10 −4 S cm −1 at room temperature. In addition, a chemically/electrochemically stable interface is rapidly formed, and Li dendrites are well restrained by a robust inorganic shield and matrix. As a result, steady Li plating/stripping for more than 1700 h at 0.25 mA cm −2 is achieved. Solid‐state batteries using this bilayer heterostructure solid electrolyte deliver promising battery performance (efficient capacity output and cycling stability) at ambient temperature (25 °C). Moreover, the pouch cells exhibit considerable flexibility in service and unexpected endurance under a series of extreme abuse tests including hitting with a nail, burning, immersion under water, and freezing in liquid nitrogen.