Rhombohedral Form of Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> as a Cathode in Li-Ion Batteries
Bibliographic record
Abstract
Ion exchange from the monoclinic NASICON phase of Na3V2(PO4)3 results in the new lithiated form of Li3V2(PO4)3, with unit cell parameters a = 8.316(1) Å and c = 22.484(1) Å in the space group R3̄. It exhibits a reversible V3+/V4+ redox couple at an attractive average potential of ∼3.8V vs Li corresponding to the extraction of 2 Li in the voltage window 3.0−4.1 V (125 mA·h/g). Oxidation is characterized by a two-phase process with an equilibrium potential of 3.77 V, which results in an 8% contraction of the c axis of the original rhombohedral unit cell as a result of partial population of the Li sites along the c axis. This is supported by solid-state 7Li NMR data, which shows that the transformation is accompanied by conversion of the site in the R3̄ cell at 85 ppm to one Li site at 62 ppm in LiV2(PO4)3. At least 1.3Li can be reversibly reinserted into the framework on discharge.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".