Additional Lithium Storage on Dynamic Electrode Surface by Charge Redistribution in Inactive Ru Metal. Issue 1 (1st December 2019)

• Record Type: Journal Article
• Authors: Kim, Yunok; Um, Ji Hyun; Lee, Hyunjoon; Choi, Woosung; Choi, Woon Ih; Lee, Hyo Sug; Kim, Ok‐Hee; Kim, Ji Man; Cho, Yong‐Hun; Yoon, Won‐Sub
• Is Part Of: Small. Volume 16:Issue 1(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-12-01
• Subjects: additional capacity -- charge redistribution -- lithium‐ion batteries -- metal nanoparticles -- ruthenium; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201905868
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Beyond a traditional view that metal nanoparticles formed upon electrochemical reaction are inactive against lithium, recently their electrochemical participations are manifested and elucidated as catalytic and interfacial effects. Here, ruthenium metal composed of ≈5 nm nanoparticles is prepared and the pure ruthenium as a lithium‐ion battery anode for complete understanding on anomalous lithium storage reaction mechanism is designed. In particular, the pure metal electrode is intended for eliminating the electrochemical reaction‐derived Li2 O phase accompanied by catalytic Li2 O decomposition and the interfacial lithium storage at Ru/Li2 O phase boundary, and thereby focusing on the ruthenium itself in exploring its electrochemical reactivity. Intriguingly, unusual lithium storage not involving redox reactions with electron transfer but leading to lattice expansion is identified in the ruthenium electrode. Size‐dependent charge redistribution at surface enables additional lithium adsorption to occur on the inactive but more environmentally sensitive nanoparticles, providing innovative insight into dynamic electrode environments in rechargeable lithium chemistry. Abstract : Pure ruthenium metal composed of ≈5 nm primary particles is designed as an anode material for lithium‐ion battery. Additional lithium storage by charge redistribution on the inactive but environmentally sensitive nanoparticles is identified beyond traditional view that metal nanoparticles are inactive against lithium. This work shed light on inactive nanostructured materials in developing high‐capacity electrode for next generation batteries.