Electrochemical lithiation of silicon with varied crystallographic orientation

Journal Article · Fri Jul 15 04:00:00 EDT 2016 · Semiconductors

DOI:https://doi.org/10.1134/S1063782616070022· OSTI ID:22649736

Rumyantsev, A. M.; Li, G. V.; Nashchekin, A. V.; Kazantsev, D. Yu.; Ber, B. Ya.; Zhdanov, V. V. ^[1]

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1. Russian Academy of Sciences, Ioffe Physical–Technical Institute (Russian Federation)

The anisotropy of lithium intercalation into the silicon anodes of Li-ion batteries is studied on microstructures having the form of a grid with 0.5-μm-thick vertical walls and on silicon wafers of varied orientation. Electrochemical lithiation is performed at room temperature in the galvanostatic mode. The charging curves of the microstructure and flat Si anodes are examined. Secondary-ion mass spectroscopy is used to determine the distribution of intercalated Li atoms across the wafer thickness. The experimental data are analyzed in terms of the two-phase model in which the lithiation process is limited by the propagation velocity of the front between the amorphous alloy with a high Li content and the crystalline Si substrate. The relationship between the rates of Li intercalation into different crystallographic planes: (110), (111), and (100), is found to be V{sub 110}: V{sub 111}: V{sub 100} = 3.1: 1.1: 1.0. It is demonstrated that microstructure anodes with (110) walls have the highest cycle life and withstand ~600 cycles when charged and discharged at a rate of 0.36 C.

• OSTI ID: 22649736
• Journal Information: Semiconductors, Journal Name: Semiconductors Journal Issue: 7 Vol. 50; ISSN SMICES; ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALLOYS
ANISOTROPY
ANODES
ELECTROCHEMISTRY
ION MICROPROBE ANALYSIS
LITHIUM
LITHIUM ION BATTERIES
MASS SPECTROSCOPY
MICROSTRUCTURE
SILICON
SUBSTRATES
TEMPERATURE RANGE 0273-0400 K