Journal ArticleDOI
Electrochemical and In Situ X‐Ray Diffraction Studies of Lithium Intercalation in Li x CoO2
Jan N. Reimers,J. R. Dahn +1 more
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TLDR
In this article, high precision voltage measurements and in situ x-ray diffraction indicate a sequence of three distinct phase transitions as varies from 1 to 0.4, two of which are situated slightly above and below and are caused by an order/disorder transition of the lithium ions.Abstract:
Electrochemical properties of are studied as Li is deintercalated from . High precision voltage measurements and in situ x‐ray diffraction indicate a sequence of three distinct phase transitions as varies from 1 to 0.4. Two of the transitions are situated slightly above and below and are caused by an order/disorder transition of the lithium ions. The order/disorder transition is studied as a function of temperature allowing the determination of an order/disorder phase diagram. In situ x‐ray diffraction measurements facilitate a direct observation of the effects of deintercalation on the host lattice crystal structure. The other phase transition is shown to be first order (coexisting phases are observed for ) involving a significant expansion of the parameter of the hexagonal unit cell. We report the variation of the lattice constants of with and show that the phase transition to the lithium ordered phase near is accompanied by a lattice distortion to a monoclinic unit cell with , , and . Finally we report an overall phase diagram for and .read more
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Journal ArticleDOI
Using in situ synchrotron x-ray diffraction to study lithium- and sodium-ion batteries: A case study with an unconventional battery electrode (Gd2TiO5)
James C. Pramudita,Robert D. Aughterson,Wesley M. Dose,Scott W. Donne,Helen E. A. Brand,Neeraj Sharma +5 more
TL;DR: In this article, in situ synchrotron XRD data on Gd2TiO5-containing cells was used to show the minor changes in reflection positions during discharge/charge that illustrates minimal volume expansion and contraction due to insertion/extraction reactions.
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Understanding the underlying mechanism of the enhanced performance of Si doped LiNi0.5Mn0.5-xSixO2 cathode material
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TL;DR: In this article, the performance of layered LiNi 0.5 Mn 0.015 has been shown to increase the diffusion activation energy of Li + O 2, which has the highest surface area.
Journal ArticleDOI
Plasma Treatments for the Low Temperature Crystallization of LiCoO2 Thin Films
TL;DR: In this article, two different plasma treatments, microwave and rf plasma treatment, were introduced for the first time for the low temperature crystallization of LiCoO 2 thin films prepared by radio frequency (rf) reactive magnetron sputtering.
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Impurity-vibrational entropy enables quasi-zero-strain layered oxide cathodes for high-voltage sodium-ion batteries
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Synthesis and Electrochemical Insertion Properties of the Layered Li x MoO2 Phases ( x = 0.74 , 0.85, and 1.00)
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