What is it about?
Here we report a unique molecular beam template approach to inlay MnO quantum dots (MnOQD) into walls of carbon hetero-nanotubes to form a brand-new composite (MnOQD@CHNTs) and investigate the influences of the inlaid quantum dots on the structures and the fast charging properties of carbon hetero-nanotubes. Plenty of tiny inlaid MnOQD in the walls of carbon nanotubes are proved to be capable of expanding the carbon layer spacing, decreasing the degree of order, forming heterojunctions with carbon, and altering the local electronic cloud density of carbon. Therefore, the capability of MnOQD@CHNTs for Li+/Na+ transfer and storage is greatly improved due to the quantum dot effect of MnO. As a result, the MnOQD@CHNTs exhibit excellent cycling and rate performances as both lithium-ion battery (LIB) and sodium-ion battery (SIB) anodes, e.g. fully charged in 28.3 s with a capacity of 392.8 mAh g-1 (~125.6 C) in LIB (the best ever reported).
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Why is it important?
Owing to the quantum dot effect, the MnOQD@CHNTs anode can be fully charged to 392.8 mAh g-1 within 28.3 s in LIB with energy density of 585.3 Wh kg-1 and power density of 74.5 kW kg-1.
Perspectives
This strategy provides new idea for in-situ synthesis of brand-new MnOQD-carbon heterostructural composite, which could also be extended to prepare many other quantum dots (Fe, Co etc)-carbon heterostructural composites with broad applications, such as Li-ion battery, lithium-sulfur battery, fuel cell and water splitting.
Dr. Huanxin Li
Hunan University
Read the Original
This page is a summary of: Ultra-fast transfer and high storage of Li + /Na + in MnO quantum dots@carbon hetero-nanotubes: Appropriate quantum dots to improve the rate, Energy Storage Materials, July 2018, Elsevier,
DOI: 10.1016/j.ensm.2018.07.021.
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