Journal
NANO ENERGY
Volume 61, Issue -, Pages 119-125Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2019.04.058
Keywords
Rapid acid treatment; Garnets; Intrinsic interfaces; Solid-state batteries
Categories
Funding
- National Natural Science Foundation of China [51771222, 51532002, 51772314, 51702346]
- National Key R&D Program of China [2018YFB0104300]
- Taishan Scholars Program
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chair Program (CRC)
- University of Western Ontario
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Garnet-type solid-state electrolytes (SSEs) are very promising due to their high ionic conductivities at room temperature and high stability against Li metal. However, the poor garnet/Li interfacial contact caused by Li2CO3 surface contaminant can lead to lithium dendrite growth and the performance decay of solid-state batteries (SSBs), which still hinders their practical application. Herein, a universal and simple method of rapid acid treatment is proposed to perfectly remove the surface Li2CO3 and retrieve a lithiophilic SSE surface. The SSE/Li interfacial resistance dramatically decreases from 940 Omega cm(2) to 26 Omega cm(2) at 30 degrees C. The acid treated garnet-SSE pellets exhibit an interfacial resistance comparable to the pellets with various surface coatings. In addition, the intrinsic garnet/Li interface remains stable during cycling, which enables the Li symmetric cells continuously cycle over 700 h under 0.2 mA cm(-2) at 30 degrees C. And the LiFePO4/Li and LiCoO2/Li cells with acid treated garnet-SSE show excellent cycle and rate performances after eliminating the surface contaminant. These results indicate that rapid acid treatment not only guides a new understanding for an intrinsic garnet/Li interface but also is a simple and high-efficiency strategy to well address the interfacial issue for SSBs.
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