4.7 Article

Hybridizing polymer electrolyte with poly(ethylene glycol) grafted polymer-like quantum dots for all-solid-state lithium batteries

Journal

JOURNAL OF MEMBRANE SCIENCE
Volume 618, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.memsci.2020.118702

Keywords

poly(ethylene glycol) grafted polymer-like quantum dot; poly(ethylene oxide); Hybrid polymer electrolyte; Ion-conductive network; All-solid-state lithium battery

Funding

  1. National Natural Science Foundation of China [51873198]
  2. Science and technology innovation talent program of Henan Province [18HASTIT002]
  3. Technology Development Project of China Petrochemical Corporation [219028-4]

Ask authors/readers for more resources

Poly (ethylene glycol) grafted polymer-like quantum dots (PPQDs) with an average diameter of around 2.5 nm were synthesized as nanofillers for hybrid polymer electrolytes, significantly enhancing ion conduction and stability. The efficient ion-conductive networks constructed by PPQDs and PEO showed a vertical Li+ conduction of 5.53 x 10(-5) S cm(-1) at 30 degrees C, 16 times higher than that of PEO electrolyte, demonstrating great potential for all-solid-state lithium batteries.
Solid-state polymer electrolytes (SPEs) show great potential owing to inherent flexibility and safety but limited by the low ionic conductivity. Herein, poly (ethylene glycol) grafted polymer-like quantum dots (PPQDs) with average diameter of similar to 2.5 nm and abundant conduction groups are synthesized as nanofillers for hybrid polymer electrolytes. The functionalization of poly (ethylene glycol) provides abundant Li+ transfer sites and meanwhile enhances the compatibility between PPQDs and poly (ethylene oxide) (PEO). Accordingly, these PPQDs uniformly disperse and form rich networks with PEO chains to effectively reduce the crystallinity of PEO and promote the dissociation of lithium salts, different from large-size or inorganic fillers. Consequently, efficient ion-conductive networks are constructed by PPQDs and PEO for vertical Li+ conduction: 5.53 x 10(-5) S cm(-1) at 30 degrees C, 16 times higher than that of PEO electrolyte. Furthermore, the hydrogen-bonding interactions at PPQD-PEO interfaces afford excellent stability and flexibility to electrolytes. And superior cycling performance of similar to 146 mAh g(-1) after 150 cycles at 1.0C with capacity decay of 0.046% per cycle is therefore achieved. Compared with traditional fillers, PPQDs with inherent advantages, i.e., molecular-level size and designable groups, endow hybrid electrolytes with dramatically enhanced ion conduction and stability, manifesting great potential for all-solid-state lithium batteries.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available