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- W2793319923 abstract "A novel protocol to compute and analyze NMR chemical shifts for extended paramagnetic solids, accounting comprehensively for Fermi-contact (FC), pseudocontact (PC), and orbital shifts, is reported and applied to the important lithium ion battery cathode materials LiFePO4 and LiCoPO4. Using an EPR-parameter-based ansatz, the approach combines periodic (hybrid) DFT computation of hyperfine and orbital-shielding tensors with an incremental cluster model for g- and zero-field-splitting (ZFS) D-tensors. The cluster model allows the use of advanced multireference wave function methods (such as CASSCF or NEVPT2). Application of this protocol shows that the 7Li shifts in the high-voltage cathode material LiCoPO4 are dominated by spin–orbit-induced PC contributions, in contrast with previous assumptions, fundamentally changing interpretations of the shifts in terms of covalency. PC contributions are smaller for the 7Li shifts of the related LiFePO4, where FC and orbital shifts dominate. The 31P shifts of both materials finally are almost pure FC shifts. Nevertheless, large ZFS contributions can give rise to non-Curie temperature dependences for both 7Li and 31P shifts." @default.
- W2793319923 created "2018-03-29" @default.
- W2793319923 creator A5009563764 @default.
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- W2793319923 date "2018-03-07" @default.
- W2793319923 modified "2023-10-17" @default.
- W2793319923 title "Quantum-Chemical Approach to NMR Chemical Shifts in Paramagnetic Solids Applied to LiFePO<sub>4</sub> and LiCoPO<sub>4</sub>" @default.
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- W2793319923 doi "https://doi.org/10.1021/acs.jpclett.8b00407" @default.
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