In operando X-ray diffraction strain measurement in Ni3Sn2 - Coated inverse opal nanoscaffold anodes for Li-ion batteries

JOURNAL OF POWER SOURCES

卷:367

Article

Glazer, Matthew P. B.^1,2  Wang, Junjie³  Cho, Jiung^3,4  Almer, Jonathan D.⁵  Okasinski, John S.⁵  Braun, Paul V.³  Dunand, David C.¹ 

[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

[2] Exponent Inc, Mat & Corros Engn Practice, Menlo Pk, CA 94025 USA

[3] Univ Illinois, Dept Mat Sci & Engn, Champaign, IL 61801 USA

[4] Korea Basic Sci Inst, Gangneung Ctr, Kangnung 210702, South Korea

[5] Argonne Natl Lab, Xray Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA

关键词: Tin anodes;    In operando;    Lithiation strain;    Intermetallic alloying anode;    Microbattery;   

DOI  :  10.1016/j.jpowsour.2017.09.040

来源: Elsevier

【 摘 要 】

Volume changes associated with the (de)lithiation of a nanostructured Ni3Sn2 coated nickel inverse opal scaffold anode create mismatch stresses and strains between the Ni3Sn2 anode material and its mechanically supporting Ni scaffold. Using in operando synchrotron x-ray diffraction measurements, elastic strains in the Ni scaffold are determined during cyclic (dis)charging of the Ni3Sn2 anode. These strains are characterized using both the center position of the Ni diffraction peaks, to quantify the average strain, and the peak breadth, which describes the distribution of strain in the measured volume. Upon lithiation (half-cell discharging) or delithiation (half-cell charging), compressive strains and peak breadth linearly increase or decrease, respectively, with charge. The evolution of the average strains and peak breadths suggests that some irreversible plastic deformation and/or delamination occurs during cycling, which can result in capacity fade in the anode. The strain behavior associated with cycling of the Ni3Sn2 anode is similar to that observed in recent studies on a Ni inverse-opal supported amorphous Si anode and demonstrates that the (de)lithiation-induced deformation and damage mechanisms are likely equivalent in both anodes, even though the magnitude of mismatch strain in the Ni3Sn2 is lower due to the lower (de)lithiation-induced contraction/expansion. (C) 2017 Elsevier B.V. All rights reserved.

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