Mechanistic Analysis Of Microstructural Attributes To Lithium Plating In Fast Charging

ACS APPLIED MATERIALS & INTERFACES(2020)

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摘要
Metallic lithium deposition on graphite anodes is a critical degradation mode in lithium-ion batteries, which limits safety and fast charge capability. A conclusive strategy to mitigate lithium deposition under fast charging yet remains elusive. In this work, we examine the role of electrode microstructure in mitigating lithium plating behavior under various operating conditions, including fast charging. The multilength scale characteristics of the electrode microstructure lead to a complex interaction of transport and kinetic limitations that significantly governs the cell performance and the occurrence of Li plating. We demonstrate, based on a comprehensive mesoscale analysis, that the performance and degradation can be significantly modulated via systematic design improvements at the hierarchy of length scales. It is found that the improvement in kinetic and transport characteristics achievable at disparate scales can dramatically affect Li plating propensity.
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关键词
lithium-ion batteries, Li plating extreme fast charging, battery safety, porous composite electrode, mesoscale modeling, electrode microstructure, secondary phase morphology
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