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
Reads0
Chats0
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
Citations
More filters
Journal ArticleDOI
Probing Lithium and Vacancy Ordering in O3 Layered LixCoO2 ( x ≈ 0.5 ) : An Electron Diffraction Study
TL;DR: X-ray and electron diffraction experiments were performed to understand the lithium and vacancy ordering phenomenon and the monoclinic distortion in Li0.5CoO2 as discussed by the authors, which was attributed primarily to the shearing of the rhombohedral oxygen lattice.
Journal ArticleDOI
Cationic and anionic redox in lithium-ion based batteries
TL;DR: What anionic redox is and the nature of the transition metal and oxygen bond is defined accompanied by three subsequent sections bridging the redox spectrum from pure anionic, to a mix of cationic and anionic and purecationic.
Journal ArticleDOI
Thermodynamic model development for lithium intercalation electrodes
TL;DR: In this article, the authors developed a frame work based on thermodynamic principles to describe the equilibrium potential of intercalation electrodes and incorporated the developed thermodynamic expressions along with the activity correction into a single particle diffusion model for a Li-ion cell consisting of a graphite and LiCoO2 electrode.
Journal ArticleDOI
Reaction Heterogeneity in LiNi0.8Co0.15Al0.05O2 Induced by Surface Layer
Antonin Grenier,Hao Liu,Kamila M. Wiaderek,Zachary W. Lebens-Higgins,Olaf J. Borkiewicz,Louis F. J. Piper,Peter J. Chupas,Karena W. Chapman +7 more
TL;DR: In this article, the intrinsic bulk reaction for pristine NCA follows solid-solution mechanism, not a two-phase as suggested previously, and they decouple the intrinsic reaction mechanism from surface-induced effects, and demonstrate that adventitious Li2CO3 forms on the electrode particle surface during exposure to air through reaction with atmospheric CO2.
Journal ArticleDOI
Mechanism for Hydrothermal Synthesis of LiFePO4 Platelets as Cathode Material for Lithium-Ion Batteries
TL;DR: Li et al. as mentioned in this paper studied the mechanism for the low-temperature hydrothermal synthesis of LiFePO4 and identified tetraphosphate in the LiFe PO4 precursor.
Related Papers (5)
Solid‐State Redox Reactions of LiCoO2 (R3̅m) for 4 Volt Secondary Lithium Cells
Tsutomu Ohzuku,Atsushi Ueda +1 more