Journal
ENERGY STORAGE MATERIALS
Volume 26, Issue -, Pages 577-584Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2019.11.031
Keywords
Na-ion batteries; Carbon anode; In-situ Mg(NO3)(2)center dot 6H(2)O solidification; Fusion-state carbonization; Solid-state carbonization
Funding
- National Natural Science Foundation of China [51725206, 51421002]
- NSFCUKRI_EPSRC [51861165201]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21070500]
- Beijing Natural Science Fund-Haidian Original Innovation Joint Fund [L182056]
Ask authors/readers for more resources
The soft carbon precursor pitch, featured with low-cost and easy-availability, is regarded as a very promising candidate for the synthesis of carbonaceous anode. However, the Na-storage performance of pitch-derived carbon is strongly hindered by its highly graphitized structure, which mainly comes from the reordering during the fusion-state carbonization. To prevent the graphitization, herein, we propose an in-situ Mg(NO3)(2)center dot 6H(2)O solidification strategy to convert the fusion-state to solid-state carbonization. The oxygen species and solid products generated from the decomposition of Mg(NO3)(2)center dot 6H(2)O can retard the melting and reordering of pitch, thus tailoring the microstructure. The optimal sample displays outstanding overall performances in both half- and full-cells, with similar to 3-fold increase in capacity. Particularly, the carbon yield is significantly increased from 61% to 92% because less organic molecules can escape. The understandings gained in this work not only offer insights to adjust the carbonization process, but also provide solutions to obtain highly disordered carbon anodes from soft carbon precursors.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available