| Title | Composite electrolytes of pyrrolidone-derivatives-PEO enable to enhance performance of all solid state lithium-ion batteries |
| Authors | Li, Xin Wang, Zijian Lin, Hai Liu, Yidong Min, Yong Pan, Feng |
| Affiliation | Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Guangdong, Peoples R China |
| Keywords | Li ion battery Solid state Composite electrolytes Pyrrolidone derivatives High ambient conductivity |
| Issue Date | 2019 |
| Publisher | ELECTROCHIMICA ACTA |
| Abstract | All-solid-state batteries with LiFePO4 cathodes and polyethylene oxide (PEO) based electrolytes are optimized with organic polymer synthesized from allyl amine and tartaric acid which show better properties including ionic conductivity, electrochemical window, charge-discharge capacity and rate performance. The rate of PEO ((MW) over bar = 4,000,000) and lithium salt (Lithium bis(trifluoromethanesulphonyl) imide, LiTFSI) is 75: 20 (w/w) and polymers of different molecular weight are tested at a wide temperature range from 27 degrees C (ambient temperature) to 120 degrees C. Electrolytes with larger amount (weighting more than half of PEO) of low-molecular-weight polymer show conductivity of above 10(-4) S cm(-1), which is similar to typical gel-polymer-electrolyte. Electrolytes made of high-molecular-weight dopant, PEO and LiTFSI through ball milling show better conductivity (5.4 x 10(-6) S cm(-1)) as well as better strength than electrolytes without dopant (1.3 x 10(-6) S cm(-1)) at room temperature. And a sensitive dependence on temperature increasing is also observed constructing to the sample without dopant. Stability below 120 degrees C also indicates promising use of this composite electrolyte in solid state lithium ion batteries. (c) 2018 Elsevier Ltd. All rights reserved. |
| URI | http://hdl.handle.net/20.500.11897/551515 |
| ISSN | 0013-4686 |
| DOI | 10.1016/j.electacta.2018.10.023 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 深圳研究生院待认领 |
