Greatly improved cycling performance has been demonstrated with conformally coated lithium-ion electrodes by atomic layer deposition (ALD) and molecular layer deposition (MLD) techniques. This paper reports the impact of coating on the electrode additives towards mitigating undesired parasitic reactions during cycling. The ALD and MLD coatings with conformality and atomic scale thickness control effectively stabilize the surface of the electrode components, and the current collector, resulting in the increase of coulombic efficiency throughout cycling. The organic fragment integrated into the recently developed MLD process allows the coating to possess excellent mechanical properties and enhanced ionic conductivity, which significantly reduces cell polarizations throughout cycling. Furthermore, remarkable improvement with cycle stability has also been achieved by coating laminated silicon-based electrodes. The successful application of both ALD and MLD coatings on silicon anodes corroborates the capabilities of advanced surface modification to address the interfacial instability and mechanical degradation of these large-volume-change lithium-ion battery electrodes.

Mitigating irreversible capacity losses from conducting carbon agents via surface modification

249th National Meeting (2015)

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