NDLI: High Ion-Conducting Solid-State Composite Electrolytes with Carbon Quantum Dot Nanofillers

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High Ion-Conducting Solid-State Composite Electrolytes with Carbon Quantum Dot Nanofillers

Content Provider	Scilit
Author	Ma, Cheng Dai, Kuan Hou, Hongshuai Ji, Xiaobo Chen, Libao Ivey, Douglas G. Wei, Weifeng
Copyright Year	2018
Description	Journal: Advanced Science Solid-state polymer electrolytes (SPEs) with high ionic conductivity are desirable for next generation lithium- and sodium-ion batteries with enhanced safety and energy density. Nanoscale fillers such as alumina, silica, and titania nanoparticles are known to improve the ionic conduction of SPEs and the conductivity enhancement is more favorable for nanofillers with a smaller size. However, aggregation of nanoscale fillers in SPEs limits particle size reduction and, in turn, hinders ionic conductivity improvement. Here, a novel poly(ethylene oxide) (PEO)-based nanocomposite polymer electrolyte (NPE) is exploited with carbon quantum dots (CQDs) that are enriched with oxygen-containing functional groups. Well-dispersed, 2.0–3.0 nm diameter CQDs offer numerous Lewis acid sites that effectively increase the dissociation degree of lithium and sodium salts, adsorption of anions, and the amorphicity of the PEO matrix. Thus, the PEO/CQDs-Li electrolyte exhibits an exceptionally high ionic conductivity of 1.39 × $10^{−4}$ S $cm^{−1}$ and a high lithium transference number of 0.48. In addition, the PEO/CQDs-Na electrolyte has ionic conductivity and sodium ion transference number values of 7.17 × $10^{−5}$ S $cm^{−1}$ and 0.42, respectively. It is further showed that all solid-state lithium/sodium rechargeable batteries assembled with PEO/CQDs NPEs display excellent rate performance and cycling stability.
Related Links	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5980199/pdf
e-ISSN	21983844
DOI	10.1002/advs.201700996
Journal	Advanced Science
Issue Number	5
Volume Number	5
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2018-05-01
Access Restriction	Open
Subject Keyword	Journal: Advanced Science Polymer Science Carbon Quantum Dots Lithium and Sodium Ion Batteries Nanocomposite Polymer Electrolytes Oxygen‐containing Functional Groups Poly(ethylene Oxide)
Content Type	Text
Resource Type	Article

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