Understanding the Na-Ion Storage Mechanism in Na<sub>3+<i>x</i></sub>V<sub>2–<i>x</i></sub>M<sub><i>x</i></sub>(PO<sub>4</sub>)<sub>3</sub> (M = Ni<sup>2+</sup>, Co<sup>2+</sup>, Mg<sup>2+</sup>; <i>x</i> = 0.1–0.5) Cathodes
Why this work is in the frame
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Bibliographic record
Abstract
Bivalent cations (M = Ni2+, Co2+, Mg2+) with different doping contents (x = 0.1, 0.2, 0.3, 0.4, 0.5) were incorporated for vanadium in the Na3+xV2–xMx(PO4)3 (NVP), yielding enhanced rate performance and capacity retention. Successful doping of these cations in the NVP structure was confirmed by powder X-ray diffraction (PXRD), vibrational FT-IR spectroscopy, and scanning electron microscopy (SEM) techniques. The improved electrochemical performance of substituted NVP cathode has been correlated to effective Na ion migration, which improved kinetics of charging and discharging properties. Mg2+ was possible to dope up to x = 0.5 in the NVP structure, which exhibited a superior electrochemical performance compared to that of Ni2+- and Co2+-doped NVP samples. The Mg2+-doped NVP electrode exhibited fast Na ion kinetics with a specific capacity of 70 mAh g–1 at a 20 C rate. The oxidation state of the vanadium in the Mg2+-substituted NVP was investigated by using X-ray photoelectron spectroscopy (XPS).
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.006 | 0.001 |
| Meta-epidemiology (narrow) | 0.007 | 0.007 |
| Meta-epidemiology (broad) | 0.007 | 0.001 |
| Bibliometrics | 0.002 | 0.004 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.003 | 0.003 |
| Open science | 0.005 | 0.003 |
| Research integrity | 0.004 | 0.003 |
| Insufficient payload (model declined to judge) | 0.000 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it