Effects of Upper Cutoff Potential on LaPO<sub>4</sub>-Coated and Uncoated Li[Ni<sub>0.42</sub>Mn<sub>0.42</sub>Co<sub>0.16</sub>]O<sub>2</sub>/Graphite Pouch Cells
Bibliographic record
Abstract
Li[Ni 0.42 Mn 0.42 Co 0.16 ]O 2 /graphite pouch cells, with and without a LaPO 4 coating on the positive electrode active material, containing the additives prop-1-ene-1,3-sultone, 1,3,2-dioxathiolane-2,2-dioxide and tris-(trimethyl-silyl) phosphite were studied using charge-hold-discharge cycling experiments up to potentials between 4.4 and 4.5 V at 40°C. Simultaneous electrochemical impedance spectroscopy measurements were made during cycling. The effects of a 24 hour hold at the top of charge at upper cutoff voltages of 4.4, 4.425, 4.45, 4.475, and 4.5 V on the impedance and capacity retention of both LaPO 4 -coated and uncoated cells were investigated. All coated cells cycled above 4.4 V exhibited severe capacity fade and large impedance growth over 80 cycles. Uncoated cells cycled to 4.45 V and below exhibited small capacity fade and virtually no impedance growth. Although uncoated cells above 4.45 V were superior to coated cells, capacity fade and impedance growth were present. Impedance growth remains one of the biggest obstacles to high voltage NMC/graphite lithium-ion cells.
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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 | 0.001 |
| 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 | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".