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Scientists Develop New 2D Carbon Material for Flexible Batteries

Aug 20, 2018

With the rapid development of wearable electronics and implantable medical devices, there is a growing demand for flexible batteries with high energy and power density as well as long cycle life. 2D materials are expected to be good candidate electrodes in terms of composition, topology, flexibility and other physical properties.

However, lithium-ion diffusion parallel to the plane of natural 2D materials with compact atomic arrangement is limited by the steric hindrance, and diffusion perpendicular to the basal plane is hindered by the aromatic carbon rings, leading to a low energy and power density.  

Recently, a research team led by Prof. HUANG Changshui from the Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT), Chinese Academy of Sciences designed and synthesized a new 2D carbon material named fluoride graphdiyne (F-GDY).

The researchers designed the chemical structure on the basis of graphdiyne according to the main issues in recent flexible batteries. The main framework was maintained for generating more storage sites for lithium-ions and providing electronic conduction channel.

Fluorine atoms were used to replace some acetylenic bonds for improving lithium-ion diffusion situation on the perpendicular direction. Moreover, the C-F bond was beneficial for ameliorating the interfacial compatibility. (Figure 1) 

 

Figure1. The synthetic route and characterization of F-GDY. (Image by HE Jianjiang) 

The experiments, together with theoretical calculations, showed that extraordinarily high reversible capacity (1700 mA h g-1) and extremely stable cycle performance (9000 cycles) were achieved by the reversible transition between C–F semi-ionic bonds and ionic bonds at the plateaus of 0.9 V.

This bottom-up strategy offers a versatile approach to the rational design of ultra-stable flexible 2D materials through solution-based processability for application in the efficient electrodes of high performance rechargeable batteries. (Figure 2) 

The related work was published in Energy & Environmental Science.

 

Figure 2. The illustration of Li storage mechanism in F-GDY. (Image by HE Jianjiang) 

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