Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 43, Pages 21248-21254Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta08095j
Keywords
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Funding
- National Basic Research Program of China [2014CB932300]
- National Natural Science Foundation of China [21673116, 21403107, 21633003, 51602144, 61735008]
- National Postdoctoral Program for Innovative Talents [BX201600067]
- Chinese Postdoctoral Science Foundation [179709]
- Natural Science Foundation of Jiangsu Province of China [BK20160068]
- PAPD of Jiangsu Higher Education Institutions
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Solid-state electrolytes (SSEs) are potential candidates for developing high-energy-density and safe all-solid-state lithium (Li)-metal batteries due to the elimination of most of the safety issues encountered with liquid electrolytes. However, unfortunately, dangerous Li dendrites still form in SSEs. Herein, we report a simple nano-polishing method to prepare a high-performance all-solid-sate Li-air battery that consists of an air cathode, Li metal anode and ultra-fine surface Li1.5Al0.5Ge1.5P3O12 (LAGP) electrolyte. Such a design effectively reduces the interface impedance of the battery and meanwhile creates an ultra-smooth/flat interface between the Li metal and LAGP electrolyte that can produce a uniform electric field across the interface, thus enabling a homogeneous metal Li-forming/deforming environment during discharge/charge processes. As a result, a long cycle life all-solid-state Li-air battery has been obtained at room temperature at 400 mA g(-1) with a capacity limitation of 1000 mA h g(-1). The experimental results reveal that Li dendrites are suppressed through eliminating protrusion-induced locally concentrated free electron density on the surface of Li metal. The present ultra-fine interface engineering may be robust enough to suppress Li-dendrites, providing new insights into the interface between the Li-metal and SSE to develop future all solid-state Li-metal batteries.
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