Lignin Derived Ultrathin All‐Solid Polymer Electrolytes with 3D Single‐Ion Nanofiber Ionic Bridge Framework for High Performance Lithium Batteries

Author:

Liu Yuhan1,Wang Pinhui1,Yang Zhenyue2,Wang Liying1,Li Zhangnan1,Liu Chengzhe1,Liu Baijun3,Sun Zhaoyan4,Pei Hanwen4,Lv Zhongyuan3,Hu Wei1ORCID,Lu Yunfeng5,Zhu Guangshan1

Affiliation:

1. Faculty of Chemistry Northeast Normal University 5268 Renmin Street Changchun 130024 P. R. China

2. Frontier Interdisciplinary Research Institute Northeast Normal University 5268 Renmin Street Changchun 130024 P. R. China

3. College of Chemistry Jilin University 2699 Qianjin Street Changchun 130012 P. R. China

4. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Renmin Street Changchun 130022 P. R. China

5. Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology 15 East North Third Ring Road Beijing 100029 P. R. China

Abstract

AbstractThe lignin derived ultrathin all‐solid composite polymer electrolyte (CPE) with a thickness of only 13.2 µm, which possess 3D nanofiber ionic bridge networks composed of single‐ion lignin‐based lithium salt (L‐Li) and poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP) as the framework, and poly(ethylene oxide)/lithium bis(trifluoromethanesulfonyl)imide (PEO/LiTFSI) as the filler, is obtained through electrospinning/spraying and hot‐pressing. t. The Li‐symmetric cell assembled with the CPE can stably cycle more than 6000 h under 0.5 mA cm−2 with little Li dendrites growth. Moreover, the assembled Li||CPE||LiFePO4 cells can stably cycle over 700 cycles at 0.2 C with a super high initial discharge capacity of 158.5 mAh g−1 at room temperature, and a favorable capacity of 123 mAh g−1 at −20 °C for 250 cycles. The excellent electrochemical performance is mainly attributed to the reason that the nanofiber ionic bridge network can afford uniformly dispersed single‐ion L‐Li through electrospinning, which synergizes with the LiTFSI well dispersed in PEO to form abundant and efficient 3D Li+ transfer channels. The ultrathin CPE induces uniform deposition of Li+ at the interface, and effectively inhibit the lithium dendrites. This work provides a promising strategy to achieve ultrathin biobased electrolytes for solid‐state lithium ion batteries.

Funder

National Natural Science Foundation of China

Chinese Academy of Sciences

Publisher

Wiley

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