A Solvent-Induced Solid Polymer Electrolyte with Controllable Polymerization for Low-Temperature Lithium Metal Batteries
Solid-state electrolytes based on in situ ring-opening polymerization of 1,3-dioxolane (DOL) have attracted widespread attention in Li metal batteries because of their high interface compatibility. However, its conventional cationic polymerization mechanism frequently results in the formation of long polymer chains during in situ polymerization, thereby impeding Li<sup>+</sup> transport. Here, we regulate the ring opening polymerization of DOL by introducing <i>N</i>,<i>N</i>-dimethyltrifluoroacetamide (FDMA), thus avoiding the formation of long polymer chains. Meanwhile, FDMA can derive a stable SEI rich in LiF during electrochemical cycling, improving interface stability and suppressing dendritic Li growth. Therefore, the full battery with LiFePO<sub>4</sub> as the cathode can achieve a high capacity retention rate of 83.9% after 400 cycles at a rate of 5.0 C. At -20 °C, the Li∥LiFePO<sub>4</sub> full battery can provide a high capacity of 137 mAh g<sup>-1</sup>. The solvent-induced strategy provides a promising new avenue for designing a solid electrolyte with high temperature resistance.
Authors
- Qian Wang (ORCID: https://orcid.org/0000-0001-5161-6241)
- Lifeng Hou (ORCID: https://orcid.org/0000-0002-2742-4968)
- Shuai Liu (ORCID: https://orcid.org/0009-0004-5491-1237)
- Hao Huang (ORCID: https://orcid.org/0000-0001-5067-4490)
- Bai Xiang (ORCID: https://orcid.org/0000-0002-4789-641X)
- Xinyue Chang (ORCID: https://orcid.org/0000-0001-7027-3889)
- Bing Wu (ORCID: https://orcid.org/0000-0001-6628-6580)
- Jiahui Zhang (ORCID: https://orcid.org/0009-0008-4087-8674)
- Shi Wang (ORCID: https://orcid.org/0000-0002-5331-413X)
- Zhong Jin (ORCID: https://orcid.org/0000-0001-8860-8579)
- Yinghui Wei (ORCID: https://orcid.org/0000-0002-8420-681X)
Institutions
- Nanjing University of Posts and Telecommunications (CN)
- China Coal Research Institute (China) (CN)
- Nanjing University (CN)
- Taiyuan University of Technology (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-03-25
- DOI
- https://doi.org/10.1021/acs.nanolett.4c06471
- Citations
- 16
- Primary Topic
- Advanced Battery Materials and Technologies
- Type
- article
- Field-Weighted Citation Impact
- 11.69
Funders
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Natural Science Foundation of Jiangsu Province
- Nanjing University of Posts and Telecommunications
- Jiangsu Science and Technology Department
- Beijing Municipal Natural Science Foundation