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- W2669110526 abstract "Strain engineering has transformed applications in the semiconductor electronics industry, but has not been widely explored as a tool for electrochemical applications. Our early studies have demonstrated for the first time that mechanical strain applied across interfaces of engineered 2-D nanomaterials or externally applied to pseudocapacitive electrodes can result in deviations in the energetics and kinetics of Faradaic charge storage reactions [1-2]. Here, we present results that extend this idea to vanadium pentoxide (V2O5) due to its well-known capability to function as a cathode for the intercalation of lithium ions. To characterize the role of strain in modulating the lithium insertion properties, we use atomic layer deposition (ALD) to prepare ultrathin coatings of crystalline V2O5 on the surface of superelastic NiTi shape memory alloy surfaces. As a key challenge in characterizing the role of strain is the ability to assess electrochemical properties in a fixed strain state, we exploit the capability of NiTi to lock-in strain in the elastic regime, which extends up to ~ 15% strain. This enables us to directly measure the average strain transferred to the V2O5 material, and correlate this to the observed electrochemical properties. Through electrochemical tests, we observe over 50 mV shift in the electrochemical potential that is correlated to strain, and over 2X change in the diffusion coefficient of lithium ions. We further build a semi-quantitative model for strain modulated battery performance that is supported by density functional theory calculations. Overall, this work demonstrates new degrees of freedom to design or engineer electrodes for energy storage by using pre-strained or strain-engineered electrode materials." @default.
- W2669110526 created "2017-06-30" @default.
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- W2669110526 date "2017-01-01" @default.
- W2669110526 modified "2023-09-25" @default.
- W2669110526 title "Strain Engineering to Control the Electrochemistry of Battery Electrodes" @default.
- W2669110526 doi "https://doi.org/10.1149/ma2017-01/5/321" @default.
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