| Autor: |
Bin Tang, Yibo Zhao, Zhiyi Wang, Shiwei Chen, Yifan Wu, Yuming Tseng, Lujiang Li, Yunlong Guo, Zhen Zhou, Shou-Hang Bo |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
eScience, Vol 1, Iss 2, Pp 194-202 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2667-1417 |
| DOI: |
10.1016/j.esci.2021.12.001 |
| Popis: |
The practical energy density of solid-state batteries remains limited, partly because of the lack of a general method to fabricate thin membranes for solid-state electrolytes with high ionic conductivity and low area-specific resistance (ASR). Herein, we use an ultrahigh concentration of a ceramic ion conductor (Na3SbS4) to build an ion-conduction “highway”, and a polymer (polyethylene oxide, 2 wt%) as a flexible host to prepare a polymer-in-ceramic ion-conducting membrane of approximately 40 μm. Without the use of any salt (e.g., NaPF6), the resulting membrane exhibits a threefold increase in electronic ASR and a twofold decrease in ionic ASR compared with a pure ceramic counterpart. The activation energy for sodium-ion transport is only 190 meV in the membrane, similar to that in pure ceramic, suggesting ion transport predominantly occurs through a percolated network of ion-conducting ceramic particles. The salt-free design also provides an opportunity to suppress dendritic metal electrodeposits, according to a recently refined chemomechanical model of metal deposition. Our work suggests that salt is not always necessary in composite solid-state electrolytes, which broadens the choice of polymers to allow the optimization of other desired attributes, such as mechanical strength, chemical/electrochemical stability, and cost. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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