Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 7, Pages 4602-4608Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00929
Keywords
lithium metal anode; dendrite; lithium metal batteries; additive; PEG
Funding
- National Natural Science Foundation of China [21771018, 21875004]
- National Natural Science Foundation of Beijing [2192018]
- PULEAD Technology Industry Co. Ltd.
- Beijing University of Chemical Technology (BUCT, China) [buctrc201901]
- High-Performance Computing Platform of Peking University
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Uncontrollable Li dendrites growth and low Coulombic efficiency (CE) have severely prevented the practical applications of Li metal anode. Here, we propose to use poly(ethylene glycol) (PEG) as an electrolyte additive for suppressing dendritic growth and improving the cycling stability of Li metal anode. The PEG molecule can be absorbed on the surface of Li metal and complex with the Li+ ions effectively, which ensures a homogeneous diffusion of Li+ near the electrode surface and fundamentally avoids dendrite formation. Thus, full cells with LiFePO4 vertical bar Li configuration can even maintain similar to 100% capacity with CE > 99.5% after 250 cycles at 5.0 C.
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