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Operando monitoring the lithium spatial distribution of lithium metal anodes
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Operando monitoring the lithium spatial distribution of lithium metal anodes
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Journal Article
Operando monitoring the lithium spatial distribution of lithium metal anodes
2018
Overview
Electrical mobility demands an increase of battery energy density beyond current lithium-ion technology. A crucial bottleneck is the development of safe and reversible lithium-metal anodes, which is challenged by short circuits caused by lithium-metal dendrites and a short cycle life owing to the reactivity with electrolytes. The evolution of the lithium-metal-film morphology is relatively poorly understood because it is difficult to monitor lithium, in particular during battery operation. Here we employ operando neutron depth profiling as a noninvasive and versatile technique, complementary to microscopic techniques, providing the spatial distribution/density of lithium during plating and stripping. The evolution of the lithium-metal-density-profile is shown to depend on the current density, electrolyte composition and cycling history, and allows monitoring the amount and distribution of inactive lithium over cycling. A small amount of reversible lithium uptake in the copper current collector during plating and stripping is revealed, providing insights towards improved lithium-metal anodes.
Rechargeable lithium metal batteries could offer a major leap in energy capacity but suffer from the electrolyte reactivity and dendrite growth. Here the authors apply neutron depth profiling to provide quantitative insight into the evolution of the Li-metal morphology during plating and stripping.
