磺酸基修饰石墨烯复合材料的储钠性能研究

doi:10.11868/j.issn.1001-4381.2020.001197

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Abstract

The functionalized graphene, with prominent capability over expansion of interlayer spacing and enhancement of sodium ion diffusivity, has gained paramount interests in fabricating anode of sodium ion batteries(SIBs). Here, a poly(sodium 4-vinylbenzenesulfonate)graphene composite(PSS-rGO) was synthesized via an in situ insertion process. The insertion structure is based on the π-π interaction between the electron of graphene and the electron of PSS, which expands the interlayer spacing of rGO and, more importantly, stabilizes the structure of the composites, restrains the stack of graphene. Beyond that, the introduced sodium sulfonate groups are capable of increasing the diffusion rate of sodium ions for fast sodium ion adsorption, ensuring superior cycling performance. The performances of the simples were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD), Raman spectrometer(Raman), X-ray photoelectron spectrometer(XPS), electrochemical workstation and battery detection system. The results show the PSS-rGO remains a reversible capacity of 256 mAh·g^-1 at 5 A·g^-1 after 6000 cycles, with an ultralow decay rate of 0.003%. This work provides a feasible avenue for exploring advanced organic-inorganic hybrid materials with high capacity, fast sodium storage and ultralong lifespan for SIBs.

Key words： sodium ions battery anode material graphene sodium sulfonate group in situ interaction

Received: 25 December 2020 Published: 18 April 2022

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TM912

Corresponding Authors: Zhuzhu DU,Ke WANG E-mail: iamzzdu@nwpu.edu.cn;ky131419@yahoo.com

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	Articles by authors
	Qianxin WU
	Lei LIU
	Jinmeng SUN
	Yifan LI
	Yuhang LIU
	Hongfang DU
	Wei AI
	Zhuzhu DU
	Ke WANG

Cite this article:

Qianxin WU,Lei LIU,Jinmeng SUN, et al. Sodium ions storage performance of PSS-rGO composites[J]. Journal of Materials Engineering, 2022, 50(4): 36-43.

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http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2020.001197 OR http://jme.biam.ac.cn/EN/Y2022/V50/I4/36

SEM images(a)-(c), TEM image(d), HRTEM image(e) and STEM image(f) of PSS-rGO composites

C(a), O(b), S(c) and Na(d) elemental mapping images of PSS-rGO composites

XRD patterns(a) and Raman spectra(b) of rGO and PSS-rGO composites

XPS spectra of rGO and PSS-rGO composites (a)survey spectra; (b)C1s spectra; (c)O1s spectra; (d)S2p spectra

7-9, 23-27]; (e)long-term cycling performance of the rGO and PSS-rGO electrodes at a current density of 5 A·g^-1
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Electrochemical performance of electrodes
(a)CV curves at a scanning rate of 0.5 mV·s^-1 in the voltage range of 0.005-3 V(vs Na/Na⁺); (b)galvanostatic charge-discharge curves of the PSS-rGO electrode at a current density of 0.5 A·g^-1; (c)rate performance of the rGO and PSS-rGO electrodes at different current densities; (d)corresponding capacity contribution ratios to the total capacity^{[7-9, 23-27]}; (e)long-term cycling performance of the rGO and PSS-rGO electrodes at a current density of 5 A·g^-1

Electrochemical performance of PSS-rGO electrode
(a)CV curves at varied scan rates(range from 2.0 mV·s^-1 to 10.0 mV·s^-1); (b)linear fittings of lgi and lgv; (c)CV curve at 4.0 mV·s^-1 with the pseudocapacitive fraction shown by the orange region; (d)histogram displaying pseudocapacitive contribution of Na⁺ storage at various scan rates

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