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

Glazer, Matthew P.B.,Wang, Junjie,Cho, Jiung,Almer, Jonathan D.,Okasinski, John S.,Braun, Paul V.,Dunand, David C. Elsevier 2017 Journal of Power Sources Vol.367 No.-
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Abstract 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. Highlights <UL> <LI> Lithiation-induced strains quantified in a Ni3Sn2 inverse opal anode in operando. </LI> <LI> Lithiation induces compressive average strains in Ni inverse opal scaffold. </LI> <LI> Ni inverse opal scaffold strain distribution reversibly broadens upon lithiation. </LI> <LI> Three measured volumes show similar cyclic strain averages and distributions. </LI> <LI> Ni3Sn2 measured cyclic strains are similar to prior Si inverse opal anode studies. </LI> </UL> Graphical abstract [DISPLAY OMISSION]
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Enhanced performance of carbon-free intermetallic zinc titanium alloy (Zn-ZnxTiy) anode for lithium-ion batteries

Nguyen, Quoc Hai,Hung, Nguyen Thanh,Park, Sang Joon,Kim, Il Tae,Hur, Jaehyun Elsevier 2019 ELECTROCHIMICA ACTA Vol.301 No.-
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Abstract A carbon-free intermetallic zinc titanium alloy (carbon-free Zn/Ti) anode, comprising active Zn nanoparticles finely dispersed in ZnxTiy (Zn0.6Ti0.4 and Zn3Ti) intermetallic buffer, is prepared via a thermal-treatment followed by a high-energy mechanical milling process for a lithium-ion battery (LIB) anode. As a counter-intuitive phenomenon, without the need of a carbon matrix, the carbon-free Zn/Ti alloy exhibits superior cyclic performance (∼1064 mAh cm−3 of volumetric capacity after 350 cycles), a good rate capability (85% capacity retention at 3 A g−1 compared to its capacity at 0.1 A g−1), and a high initial coulombic efficiency (88%). Although the use of hybrid TiC-C matrix as a control sample still affords highly stable cyclic performance and good rate capability, it exhibits a relatively lower capacity than a carbon-free alloy electrode. The enhanced performance of carbon-free Zn/Ti anodes for LIBs is owing to the presence of stable and cohesive ZnxTiy intermetallic phases that provide high conductivity and mechanical stability, thereby mitigating the large volume changes of Zn particles during the lithiation/delithiation processes. High-performance Zn-ZnxTiy can be seen as a new promising anode for the next-generation energy storage technology. Highlights <UL> <LI> Carbon-free Zn-ZnxTiy alloy was developed as a new promising anode in LIBs. </LI> <LI> Zn-ZnxTiy alloy was synthesized by heat-treatment followed by HEMM. </LI> <LI> ZnxTiy acted as effective buffers with high conductivity and mechanical stability. </LI> <LI> Zn-ZnxTiy anode outperformed its counterpart with added carbon (Zn-TiC-C). </LI> <LI> Zn-ZnxTiy anodes demonstrate the extremely high volumetric capacity. </LI> </UL> Graphical abstract [DISPLAY OMISSION]
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반응합성 코팅된 Ni-Al 금속간화합물의 미끄럼 마찰마모특성에 관한 연구

이한영(H. Y. Lee) 한국트라이볼로지학회 2015 한국트라이볼로지학회 학술대회 Vol.2015 No.10
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