Surface Effects on the Physical and Electrochemical Properties of Thin LiFePO<sub>4</sub> Particles
Bibliographic record
Abstract
The structure of LiFePO 4 particles prepared by a new milling route has been investigated, with emphasis on surface effects found to be important for such small particles, whose sizes were distributed in the range 30–40 nm. The bulk and surface properties of the particles were investigated by a combination of XRD, TEM, FTIR, and magnetic measurements before and after application of a carbon coating intended to optimize the electrochemical performance of the powder used as a cathode element of a new generation of lithium-ion battery. Before the carbon coating was applied, the particles were well-crystallized in the bulk and free from any impurities, but they were surrounded with a disordered, ~8 Å thick surface layer in which the iron ions were in the Fe 3+ low-spin ( S = 1 / 2 ) configuration. Carbon coating at 750 °C reduced the disorder at the surface and switched the Fe 3+ ions in the surface layer to the high-spin ( S = 5 / 2 ) configuration. These results are discussed with respect to similar effects recently observed for ferrite nanoparticles used in spintronics and biological molecules such as proteins that contain heme Fe.
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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".