Abstract
The low ionic conductivity, narrow electrochemical window, poor interfacial stability with lithium metal, and non-degradability of raw materials are the main problems of solid polymer electrolytes, restricting the development of lithium solid-state batteries. In this paper, a biodegradable poly (2,3-butanediol/1,3-propanediol/succinic acid/sebacic acid/itaconic acid) ester was designed and used as a substrate to prepare biodegradable polyester solid polymer electrolytes for solid-state lithium batteries using a simple solution-casting method. A large number of ester-based polar groups in the amorphous polymer become a high-speed channel for carrying lithium ions as a weak coordination site. The biodegradable polyester solid polymer electrolyte exhibits a wide electrochemical window of 5.08 V (vs. Li/Li+), high ionic conductivity of 1.03 mS cm−1 (25 °C), and a large Li+ transference number of 0.56. The electrolyte exhibits good interfacial stability with lithium, with stable Li plating/stripping behavior at room temperature over 2100 h. This design strategy for biodegradable polyester solid polymer electrolytes offers new possibilities for the development of matrix materials for environmentally friendly lithium metal solid-state batteries.
Original language | English |
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Article number | 3027 |
Journal | Nanomaterials |
Volume | 13 |
Issue number | 23 |
DOIs | |
Publication status | Published - Dec 2023 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2023 by the authors.
Funding
This research was funded by National Natural Science Foundation of China, Basic Science Center Program (No.51988102), Sichuan Province Science and Technology Support Program, China (No. 2069998), National Natural Science Foundation of China (No. 52003019, 52073011), Central Guidance Local Innovation Base Construction Project, China (No. 2022ZYD0130), Basic research funds for central universities, China (No. ZYGX2019Z009).
Keywords
- biodegradable
- lithium metal batteries
- polyester polymers
- solid polymer electrolyte