Modulating ion–dipole interactions in nonflammable phosphonate-based electrolyte for safe and stable sodium-ion pouch cells
Phosphonate-based electrolytes with the merits of low cost and intrinsic nonflammability are promising candidates to realize the safe operation of sodium-ion batteries. However, they generally suffer from poor interfacial chemistry because of the solvent-dominated solvation structure induced by the strong ion-dipole interactions between cations and phosphonate molecules. Herein, we report an electrolyte design strategy that selectively improves the competitive coordination of low-solvating-power molecules, achieving stable interfacial chemistry with a non-flammable, low-cost and fluorine-free electrolyte. By improving the ion-ion interaction between cation and anion, weakly coordinated molecules can enter the Na<sup>+</sup> solvation shell, thereby promoting more adjustable and advantageous interfacial chemistry. As a result, the fluorine-free Prussian blue||hard carbon pouch cell, with a high cathode mass loading of ∼20 mg cm<sup>-2</sup>, reaches a high capacity retention with an energy density of over 221.7 Wh kg<sup>-1</sup> based on electrode mass and 115.1 Wh kg<sup>-1</sup> based on battery mass.
Authors
- Yao-Jie Lei
- Wei‐Hong Lai (ORCID: https://orcid.org/0000-0002-8685-9662)
- Shulei Chou (ORCID: https://orcid.org/0000-0003-1155-6082)
- Xin Tan (ORCID: https://orcid.org/0000-0001-9515-2346)
- Yingying Dai (ORCID: https://orcid.org/0000-0001-9201-6445)
- S. Li
- Zhengkun Xie (ORCID: https://orcid.org/0000-0001-7422-9527)
- Li Li (ORCID: https://orcid.org/0000-0001-8494-4997)
- Lin Li (ORCID: https://orcid.org/0000-0002-4342-6816)
- Weihua Chen (ORCID: https://orcid.org/0000-0002-0548-330X)
- Zhuo Yang (ORCID: https://orcid.org/0000-0002-1073-6463)
- Jian Chen (ORCID: https://orcid.org/0000-0003-2095-9457)
- Zhiqiang Hao
- Xunzhu Zhou
Institutions
- Shanghai University (CN)
- Wenzhou University (CN)
- University of Wollongong (AU)
- Fudan University (CN)
- Zhengzhou University (CN)
- Zhengzhou University of Science and Technology (CN)
- Collaborative Innovation Center of Chemistry for Energy Materials (CN)
- South China University of Technology (CN)
Publication Details
- Journal
- National Science Review
- Published
- 2024-12-23
- DOI
- https://doi.org/10.1093/nsr/nwae466
- Citations
- 40
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 8.35
Funders
- National Natural Science Foundation of China
- Australian Research Council
- Science and Technology Plan Project of Wenzhou, China
- High-end Foreign Experts Recruitment Plan of China
- Basic Research Project of Wenzhou City
- Natural Science Foundation of Zhejiang Province