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High-energy long-cycling all-solid-state lithium metal batteries enabled by silver-carbon composite anodes

Journal
Nature Energy
Date
2020.03.09
Abstract
All-solid-state battery (ASSB) with lithium metal anode is a strong candidate deemed to surpass conventional lithium-ion batteries (LIBs). However, the undesirable Li dendrite growth and low Coulombic efficiency impede the practical application of lithium metal batteries. Here we report an all-solid-state lithium metal battery with sulfide electrolytes exhibiting high energy density and superior cycle life. An NMC cathode with high specific capacity (>210 mAh g-1) and high areal capacity (>6.8 mAh cm-2) and a newly designed anode comprising a silver-carbon (Ag-C) composite layer are employed. It is shown that Li metal can be plated and stripped between the Ag-C layer and the stainless steel (SUS) current collector repeatedly during cell cycling. A prototype pouch cell (0.6 Ah) thus prepared can exhibit high energy density (>900 Wh L-1), stable Coulombic efficiency over 99.8% and long cycle life (1000 times).
Reference
Nature Energy (2020)
DOI
http://dx.doi.org/10.1038/s41560-020-0575-z