| Autor: |
Ai-Long Chen, Nan Shang, Yue Ouyang, Lulu Mo, Chunyang Zhou, Weng Weei Tjiu, Feili Lai, Yue-E Miao, Tianxi Liu |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
eScience, Vol 2, Iss 2, Pp 192-200 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2667-1417 |
| DOI: |
10.1016/j.esci.2022.02.003 |
| Popis: |
Uncontrolled lithium dendrite growth hinders the practical application of lithium metal batteries (LMBs). Herein, we report a novel Li+ flux distributor achieved by placing an electroactive polyvinylidene fluoride/polymethyl methacrylate (PVDF/PMMA) composite nanofiber interlayer on a current collector, inducing uniform lithium deposition to mitigate the dendrite problem. Specifically, the released PMMA reacts with Li+ to form abundant C–O–Li bonds and generate in situ a stable lithiophilic PMMA-Li solid electrolyte interphase layer. Theoretical calculations reveal that polar C–F groups in the PVDF framework and lithiophilic PMMA-Li provide homo-dispersed Li+ migration pathways with low energy barriers. Consequently, uniform Li nucleation is achieved at the molecular level, resulting in ultrahigh cycling stability with dendrite-free Li deposition at 5 mA cm−2 and 5 mAh cm−2 for over 500 h. The PVDF/PMMA ∼ Li || LiFePO4 (LFP) full cell presents an increased rate capacity of 110 mAh g−1 at 10 C. In addition, a soft-package battery demonstrates a high energy density of 289 Wh kg−1. This work provides a facile design for stable lithium metal anodes to promote the practical use of LMBs and other alkali metal batteries. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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