Li[Ni<sub>0.5</sub>Mn<sub>0.3</sub>Co<sub>0.2</sub>]O<sub>2</sub> As a Superior Alternative to LiFePO<sub>4</sub> for Long-Lived Low Voltage Li-Ion Cells
Bibliographic record
Abstract
Over the last decade, portable electronics and electric vehicle manufacturers have demanded Li-ion batteries with increasing energy density and lower costs, to satisfy the goals of smaller, more affordable devices and greater run time. Other applications require Li-ion batteries with increased priority on cycle and calendar-life. These include vehicle-to-grid storage, stationary energy storage and battery leasing. Li[Ni0.5Mn0.3Co0.2]O2//graphite (NMC532) pouch cells with only sufficient graphite for operation to 3.80 V (rather than ≥ 4.2 V) are presented as a low-voltage cell type for applications that require massive cycle and calendar-life. Charge-discharge cycling, ultra-high precision coulometry and impedance spectroscopy are used to characterize these cells and form a comparison with LiFePO4//graphite (LFP) pouch cells. The low-voltage NMC532 cells are shown to be superior in both capacity retention and energy density to the LFP cells. Lifetime predictions are made as a function of temperature and charging voltage, with room temperature operation beyond 100 years suggested in certain cases.
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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 | 0.002 | 0.006 |
| Meta-epidemiology (narrow) | 0.003 | 0.004 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.002 | 0.005 |
| Insufficient payload (model declined to judge) | 0.000 | 0.003 |
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; both teacher heads agree on what is shown here.
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".