Controlled SnO<sub>2</sub> Crystallinity Effectively Dominating Sodium Storage Performance
Why this work is in the frame
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Bibliographic record
Abstract
The exploration of sodium ion batteries (SIBs) is a profound challenge due to the rich sodium abundance and limited supply of lithium on earth. Here, amorphous SnO 2 /graphene aerogel (a‐SnO 2 /GA) nanocomposites have been successfully synthesized via a hydrothermal method for use as anode materials in SIBs. The designed annealing process produces crystalline SnO 2 /graphene aerogel (c‐SnO 2 /GA) nanocomposites. For the first time, the significant effects of SnO 2 crystallinity on sodium storage performance are studied in detail. Notably, a‐SnO 2 /GA is more effective than c‐SnO 2 /GA in overcoming electrode degradation from large volume changes associated with charge–discharge processes. Surprisingly, the amorphous SnO 2 delivers a high specific capacity of 380.2 mAh g −1 after 100 cycles at a current density of 50 mA g −1 , which is almost three times as much as for crystalline SnO 2 (138.6 mAh g −1 ). The impressive electrochemical performance of amorphous SnO 2 can be attributed to the intrinsic isotropic nature, the enhanced Na + diffusion coefficient, and the strong interaction between amorphous SnO 2 and GA. In addition, amorphous SnO 2 particles with the smaller size better function to relieve the volume expansion/shrinkage. This study provides a significant research direction aiming to increase the electrochemical performance of the anode materials used in SIBs.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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 it