期刊
ADVANCED MATERIALS
卷 32, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201906221
关键词
Li-metal batteries; oxide ceramics; solid-state electrolytes; tape casting; ultrathin films
类别
资金
- National Key R&D Program of China [2016YFA0202600]
- National Natural Science Foundation of China [21776098, 21536005, 21576100]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2017A030306022]
Ceramic oxide electrolytes are outstanding due to their excellent thermostability, wide electrochemical stable windows, superior Li-ion conductivity, and high elastic modulus compared to other electrolytes. To achieve high energy density, all-solid-state batteries require thin solid-state electrolytes that are dozens of micrometers thick due to the high density of ceramic electrolytes. Perovskite-type Li0.34La0.56TiO3 (LLTO) freestanding ceramic electrolyte film with a thickness of 25 mu m is prepared by tape-casting. Compared to a thick electrolyte (>200 mu m) obtained by cold-pressing, the total Li ionic conductivity of this LLTO film improves from 9.6 x 10(-6) to 2.0 x 10(-5) S cm(-1). In addition, the LLTO film with a thickness of 25 mu m exhibits a flexural strength of 264 MPa. An all-solid-state Li-metal battery assembled with a 41 mu m thick LLTO exhibits an initial discharge capacity of 145 mAh g(-1) and a high capacity retention ratio of 86.2% after 50 cycles. Reducing the thickness of oxide ceramic electrolytes is crucial to reduce the resistance of electrolytes and improve the energy density of Li-metal batteries.
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