Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003416
Keywords
external pressure; Li dendrites; Li metal batteries; mechano-electrochemical properties; phase field model
Categories
Funding
- National Natural Science Foundation of China [21825501, U1801257]
- National Key Research and Development Program [2016YFA0202500, 2016YFA0200102]
- Tsinghua University Initiative Scientific Research Program
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External pressure has a significant impact on the morphology and performance of Li metal batteries, affecting the electroplating reactions and the shape of dendrites. A phase diagram of routine electrolytes under various external pressures has been established, providing rational guidance for designing pressure management systems in batteries.
High-energy density lithium metal batteries have achieved great progress as next-generation rechargeable cells. However, the huge gap in the switching from coin to pouch cells hinders their practical application. External pressure, as one discrepancy between coin and pouch cells, plays an important role in the performance of Li metal anodes. Herein the mechanism for the impact of external pressure on Li dendrites is revealed and quantified by a mechano-electrochemical phase field model. Two influence approaches are outlined as: 1) Inhibiting the progress of electroplating reactions, which lower the rate performance of cells; 2) Shaping the morphology of Li dendrites to be smooth and dense but increasing the mechanical instability. Furthermore, a phase diagram of routine electrolytes (including electrolyte-immersed separators and solid polymer electrolytes) with respect to various external pressures is established, giving rational guidance for designing pressure management systems in working batteries.
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