Development of High-performance Carbon and Phosphorus Anode Materials for Sodium-ion Batteries
Bibliographic record
Abstract
Abstract\nLithium-ion batteries, as dominant power sources for prevailing consumer electronics and electric vehicles, have been plagued by limited lithium resources with the soaring prices. Sodium-ion batteries, benefitted from ubiquitous and inexpensive sodium resources without toxicity and pollution, have emerged as promising alternatives for large-scale applications. Considering their kinetic challenges and disadvantageous energy densities, it is urgently necessary to pursue high-performance electrode materials to remedy these intrinsic defects. For anode materials, the primary choices of sodium metal and graphite are correspondingly denied for safety issues and intercalation incapability. Therefore, the objective for this doctoral work is to develop high-performance anode materials with large reversible capacities, long cycle life, high rate capabilities, and environmental friendliness. Carbon anode materials with the high electrochemical durability and physical/chemical stability have been chosen as objects in the first part. Additionally, phosphorus anode materials with a highest theoretical specific capacity and a desirable operating voltage range have been selected as objects in the second part.\nFirstly, carbon-based materials with optimized porosities and functionalities have been introduced into an ether-based electrolyte. A novel synergistic mechanism, incorporating the sodium ion insertion into disordered structure with the solvated sodium ions co-intercalation into graphitic structure, has been utilized to boost the sodium storage capabilities of porous carbon blacks. Simultaneously, the controlled emergence of a robust SEI thin film in ether-based electrolyte could maintain the fragile porous structure and further facilitate the sodium ions/solvated sodium ion compounds migrations. Furthermore, the desirable microporosity and the oxygenated functionalities could provide more active sites for sodium storage.\nSecondly, the effects of storage conditions and binders on electrochemical performances of P/C electrodes have been investigated. Initially, the formation and accumulation of phosphate compounds was identified for P/C electrodes. Even though the cycle stability of an aged electrode would be improved by an oxidation layer toward the smaller volume changes, the formation of these insulating compounds would sacrifice the reversible capacity and rate capability. Surprisingly, the utilization of different binders would determine the oxidation degrees of P/C electrodes. Their electrochemical properties have positive relationship with oxidation of active phosphorus for electrodes using different binders.
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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 | 0.001 |
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".