NaCrO2 is a Fundamentally Safe Positive Electrode Material for Sodium-Ion Batteries with Liquid Electrolytes
Bibliographic record
Abstract
Layered structure NaCrO2 (R-3m) was successfully synthesized by solid state reaction. The electrochemical performance of NaCrO2 as a positive electrode material for sodium-ion batteries was tested at room temperature using two-electrode coin cells with NaClO4/PC electrolyte. NaCrO2 delivered a reversible capacity of 110 mAh/g during the first charge and had good cyclability. The reaction between deintercalated NaxCrO2 (∼Na0.5CrO2) and ethylene carbonate/diethyl carbonate solvent was studied using Accelerating Rate Calorimetry (ARC). The results were compared to analogous results for Li0.5CoO2 and Li0FePO4 under the same conditions. Na0.5CrO2 showed an unexpected excellent thermal stability in solvent with no heat release in the ARC test temperature range. An X-ray diffraction study showed that Na0.5CrO2 decomposes to NaCrO2 and P3-type layered structure CrO2-δ with minimal oxygen release during the ARC tests, which explains the lack of exothermic behavior.
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How this classification was reachedexpand
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 | 0.000 | 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) | 0.000 | 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 teacher head, 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".