Abstract
An in situ NMR study of Li deposition and the SEI on Li metal. Isotope exchange measurements reveal the fast transport properties in the SEI formed with FEC and the accelerated SEI formation rate, in part explaining the homogeneous electrodeposition using FEC additives.
Highlights
The search for higher energy density rechargeable lithium batteries has created a renewed interest in lithium (Li) metal anodes
The resonance from Li metal depends on the orientation of the Li metal anode strip with respect to the static magnetic eld, B0, due to Li metal's temperature independent paramagnetism (TIP).[37,44]
The numerical simulations of the isotope exchange curves show that the Li+–Li0 exchange rate, quanti ed here via the isotope exchange ux Jex, through the LP30 + fluoroethylene carbonate (FEC) chemically-derived solid electrolyte interphase (SEI) is twice as fast as transport through the LP30-derived SEI (Table 2) and the more whisker-like morphology that forms in LP30 can, at least in part, be explained by the slower Li+ transport in the SEI
Summary
The search for higher energy density rechargeable lithium batteries has created a renewed interest in lithium (Li) metal anodes. Li metal has the highest volumetric and gravimetric energy density of all negative electrodes, it suffers from both capacity fading and safety issues.[1,2] The uneven electrodeposition of Li on the metal anode results in high surface area microstructures that can lead to potentially hazardous situations such as cell short-circuiting and thermal runaway. The microstructures formed under Li deposition can exhibit a wide range of morphologies including needle, whisker, bush-like, mossy and fractal dendrites.[3,4] A detailed understanding of the parameters that dictate the different growth modes of microstructural Li is necessary to develop effective strategies to mitigate microstructural growth and to enable the use of Li metal anodes in batteries.
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