Journal
JOURNAL OF POWER SOURCES
Volume 300, Issue -, Pages 24-28Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.09.061
Keywords
All solid state batteries; Lithium garnets; Ceramic electrolytes; Ionic and electronic conducting networks
Funding
- National Key Basic Research Program of China [2014CB921004]
- Key Research Program of Chinese Academy of Sciences [KGZD-EW-T06]
- National Natural Science Foundation of China [U1232111]
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All solid-state lithium batteries are constructed by using highly conducting Ta-doped Li7La3Zr2O12 (LLZTO) as the solid electrolytes as well as the supports, coated with composite cathodes consisting of poly(vinylidene fluoride) (PVdF):LiTFSI, Ketjen Black, and carbon-coated LiFePO4 on one side and attached with Li anode on the other side. At 60 degrees C, the batteries show the first discharge capacity of 150 mAh g(-1) at 0.05 C and 93% capacity retention after 100 cycles. As the current density increases from 0.05 C to 1 C, the specific capacity decreases from 150 mAh g(-1) to 100 mAh g(-1). Further elevated temperature up to 100 degrees C leads to further improved performance, i.e. 126 mAh g(-1) at 1 C and 99% capacity retention after 100 cycles. This good performance can be attributed to the highly conducting ceramic electrolytes, the optimum electronic and ionic conducting networks in the composite cathodes, and closely contacted cathode/LLZTO interface. These results indicate that the present strategy is promising for development of high-performance solid-state Li-ion batteries operated at medium temperature. (C) 2015 Elsevier B.V. All rights reserved.
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