Understanding the Critical Role of the Ag Nanophase in Boosting the Initial Reversibility of Transition Metal Oxide Anodes for Lithium-Ion Batteries

Daehee Lee, Mihye Wu, Dong Hyun Kim, Changju Chae, Min Kyung Cho, Ji Young Kim, Sun Sook Lee, Sungho Choi, Youngmin Choi, Tae Joo Shin, Kyung Yoon Chung, Sunho Jeong, Jooho Moon

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4 Citations (Scopus)

Abstract

The initial reversible capacity, a critical impediment in transition metal oxide-based anodes, is augmented in conversion-reaction-involved CoO anodes for lithium-ion batteries, by incorporating a chemically synthesized Ag nanophase. With an increase in the added amount of Ag nanophase from 5 to 15 wt %, the initial capacity loss decreases linearly up to 31.7%. The Ag nanophase maintains its pristine metallic nature without undergoing phase transformations, even during repeated vigorous electrochemical reactions of the active CoO phase. Complementary ex situ chemical/physical analyses suggest that the Ag nanophase promotes the catalytic generation of reversible gel-like/polymeric films wherein lithium ions are stored capacitively in the low-voltage region below 0.7 V during discharging. These scientific findings would provide a heretofore unrecognized pathway to resolving a major issue associated with the critical irreversibility in conversion-type transition metal oxide anodes.

Original languageEnglish
Pages (from-to)21715-21722
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number26
DOIs
Publication statusPublished - 2017 Jul 5

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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    Lee, D., Wu, M., Kim, D. H., Chae, C., Cho, M. K., Kim, J. Y., Lee, S. S., Choi, S., Choi, Y., Shin, T. J., Chung, K. Y., Jeong, S., & Moon, J. (2017). Understanding the Critical Role of the Ag Nanophase in Boosting the Initial Reversibility of Transition Metal Oxide Anodes for Lithium-Ion Batteries. ACS Applied Materials and Interfaces, 9(26), 21715-21722. https://doi.org/10.1021/acsami.7b01559