Investigation of P2-Na<sub>2/3</sub>Mn<sub>1/3</sub>Fe<sub>1/3</sub>Co<sub>1/3</sub>O<sub>2</sub>for Na-Ion Battery Positive Electrodes
Bibliographic record
Abstract
The preparation and electrochemical properties of a new P2-Na 2/3 Mn 1/3 Fe 1/3 Co 1/3 O 2 phase is reported. This material has a high reversible capacity of 173 mAh/g and an average voltage of 3.00 V, resulting in an estimated 520 mWh/g (2240 Wh/L) when discharged from 4.5 V. Using ex-situ Mössbauer spectroscopy, it is found that all Fe is 3+ in the starting material. Fe 3+ → Fe 4+ proceeds linearly during charge between OCV and 4.1 V and continues at high voltages, and suggests simultaneous mixed metal oxidation during removal of Na. At 4.1 V (91 mAh/g first charge) an estimated 40% of the iron present is 4+. Excellent cycling characteristics with very low voltage hysteresis can be obtained using this cutoff voltage. Access of a high voltage plateau at voltages above 4.1 V results in decreased capacity retention.
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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".