期刊论文详细信息
JOURNAL OF POWER SOURCES 卷:495
Polymer-ceramic composite electrolytes for all-solid-state lithium batteries: Ionic conductivity and chemical interaction enhanced by oxygen vacancy in ceramic nanofibers
Article
Yang, Hui1  Abdullah, Muhammad2  Bright, Joeseph3  Hu, Weiguo4  Kittilstved, Kevin2  Xu, Yaobin5  Wang, Chongmin5  Zhang, Xiangwu6  Wu, Nianqiang1,3 
[1] Univ Massachusetts, Dept Chem Engn, Amherst, MA 01003 USA
[2] Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA
[3] West Virginia Univ, Dept Mech & Aerosp Engn, Morgantown, WV 26506 USA
[4] Univ Massachusetts, Conte Polymer Res Ctr, Amherst, MA 01003 USA
[5] Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA
[6] North Carolina State Univ, Wilson Coll Text, Dept Text Engn Chem & Sci, Fiber & Polymer Sci Program, Raleigh, NC 27695 USA
关键词: Lithium battery;    Solid-state electrolyte;    Composite;    Oxygen vacancy;    Lithium ion;    Ion transport;   
DOI  :  10.1016/j.jpowsour.2021.229796
来源: Elsevier
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【 摘 要 】

Perovskite Li-3x La2/3-x TiO3 (LLTO) nanofibers have been heat-treated in the hydrogen-containing atmosphere and then incorporated with the poly(vinylidene fluoride)-co-hexafluoropropylene (PVDF-HFP) polymer to form a composite electrolyte. Hydrogen treatment has created oxygen vacancies in the LLTO nanofibers, which has reduced the activation energy of Li ion transport along intra-grains and inter-grains, leading to an improvement in the ion conductivity of LLTO nanofibers. Hydrogen treatment of the LLTO nanofibers has also enhanced the chemical interaction between the LLTO nanofibers and the polymer matrix in the composite electrolyte, and favored the Li ion transport at the nanofiber/polymer interface, improving the ion conductivity of the composite electrolyte to 3.4 x 10(-4) S/cm at room temperature. As a result, the Li|composite-electrolyte|Li half-cell exhibits good stability during lithium plating/stripping cycling at room temperature, showing an overpotential of -91 mV at a constant current density of 0.5 mA/cm(2). The full-cell battery with the composite electrolyte, lithium metal anode and lithium iron phosphate cathode shows excellent rate capacity and cycling performance.

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