期刊
CHEMICAL ENGINEERING JOURNAL
卷 421, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130000
关键词
Poly(ionic liquid) electrolyte; Double cross-linked structure; Quasi-solid electrolyte; Lithium-ion battery
资金
- Hunan Provincial Natural Science Foundation of China [2019JJ40069]
- scientific research fundation of Hunan Provincial Education Department [20A149, 19C0596]
A new type of bi-functional ionic liquid was synthesized and polymerized into double crosslinked poly(ionic liquid) electrolyte (PIL-PEI) by dual cross-linking method, exhibiting satisfactory flexibility, thermal stability, and remarkable electrochemical performances. The batteries assembled with PIL-PEI showed significantly improved electrochemical performances in terms of charge/discharge capacity, rate behavior, and long-term lifespan.
Liquid leakage and lithium dendrite growth are common safety hazards of lithium-ion batteries, and the application of quasi-solid electrolytes are considered to be the most promising material for inhibiting the safety problems. Herein, a new type of bi-functional ionic liquid is synthesized and polymerized into double crosslinked poly(ionic liquid) electrolyte (denoted as PIL-PEI) by dual cross-linking method [ring-opening polymerization network: epoxy groups in 1-vinyl-3-epoxypropylimidazolium bis(trifluoromethanesulfonyl)imide (VEIMTFSI) cross-linked with amino-groups in poly(ethylene imine) (PEI), radical cross-linking network: VEIM-TFSI cross-linked with poly(ethylene glycol) diacrylate (PEGDA)]. The Double cross-linked network of PIL-PEI reveals satisfactory flexibility, thermal stability and remarkable electrochemical performances (room-temperature ionic conductivity, 1.03 x 10-3 S cm-1 and lithium-ion transference number, 0.47). Furthermore, the compact network of PIL-PEI enables the formation of a strong solid electrolyte interface (SEI) layer on the lithium metal leading to the inhibition of lithium dendrite growth. As results, the batteries electrochemical performances, such as high charge/discharge capacity (165.6 mAh g-1), robust rate behavior (5.0C for 94 mAh g-1) and long-term lifespan (97.8% coulomb efficiency after 200 cycles) are significantly improved after assembled by LiFePO4based cells equipping PIL-PEI as electrolyte. The soft package cell assembled with PIL-PEI is able to successfully light up the LED light and keep illuminating under varying hazardous situations such as bending and cutting, indicating that the PIL-PEI will have potential application value in highly secure flexible electronic devices.
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