Supercritical CO2 Assisted Solvothermal Preparation of CoO/Graphene Nanocomposites for High Performance Lithium-Ion Batteries

Yuan, Ruoxin; Wen, Hao; Zeng, Li; Li, Xi; Liu, Xingang; Zhang, Chuhong

doi:10.3390/nano11030694

Open AccessArticle

Supercritical CO₂ Assisted Solvothermal Preparation of CoO/Graphene Nanocomposites for High Performance Lithium-Ion Batteries

by

Ruoxin Yuan

^†,

Hao Wen

^†,

Li Zeng

,

Xi Li

,

Xingang Liu

^* and

Chuhong Zhang

^*

State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China

^*

Authors to whom correspondence should be addressed.

^†

These authors contribute equally to this work.

Nanomaterials 2021, 11(3), 694; https://doi.org/10.3390/nano11030694

Submission received: 7 February 2021 / Revised: 6 March 2021 / Accepted: 8 March 2021 / Published: 10 March 2021

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Abstract

Supercritical CO₂ (scCO₂) is often used to prepare graphene/metal oxide nanocomposite anodes for high performance lithium-ion batteries (LIBs) by the assisted solvothermal method due to its low viscosity, high diffusion, zero surface tension and good surface wettability. However, the formation mechanism of metal oxides and the combination mechanism between metal oxides and graphene in this system are superficial. In this work, a cobalt monoxide/graphene (CoO/G) nanocomposite is fabricated via the scCO₂ assisted solvothermal method followed by thermal treatment. We elucidate the mechanism that amorphous intermediates obtain by the scCO₂ assisted solvothermal method, and then ultrafine CoO nanoparticles are crystallized during the heat treatment. In addition, scCO₂ can promote CoO to be tightly fixed on the surface of graphene nanosheets by interfacial chemical bonds, which can effectively improve its cycle stability and rate performance. As expected, the CoO/G composites exhibit higher specific capacity (961 mAh g⁻¹ at 100 mA g⁻¹), excellent cyclic stability and rate capability (617 mAh g⁻¹ after 500 cycles at 1000 mA g⁻¹) when applied as an anode of LIB.

Keywords: lithium-ion battery; anode; supercritical carbon dioxide; cobalt monoxide; graphene

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MDPI and ACS Style

Yuan, R.; Wen, H.; Zeng, L.; Li, X.; Liu, X.; Zhang, C. Supercritical CO₂ Assisted Solvothermal Preparation of CoO/Graphene Nanocomposites for High Performance Lithium-Ion Batteries. Nanomaterials 2021, 11, 694. https://doi.org/10.3390/nano11030694

AMA Style

Yuan R, Wen H, Zeng L, Li X, Liu X, Zhang C. Supercritical CO₂ Assisted Solvothermal Preparation of CoO/Graphene Nanocomposites for High Performance Lithium-Ion Batteries. Nanomaterials. 2021; 11(3):694. https://doi.org/10.3390/nano11030694

Chicago/Turabian Style

Yuan, Ruoxin, Hao Wen, Li Zeng, Xi Li, Xingang Liu, and Chuhong Zhang. 2021. "Supercritical CO₂ Assisted Solvothermal Preparation of CoO/Graphene Nanocomposites for High Performance Lithium-Ion Batteries" Nanomaterials 11, no. 3: 694. https://doi.org/10.3390/nano11030694

APA Style

Yuan, R., Wen, H., Zeng, L., Li, X., Liu, X., & Zhang, C. (2021). Supercritical CO₂ Assisted Solvothermal Preparation of CoO/Graphene Nanocomposites for High Performance Lithium-Ion Batteries. Nanomaterials, 11(3), 694. https://doi.org/10.3390/nano11030694

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Supercritical CO₂ Assisted Solvothermal Preparation of CoO/Graphene Nanocomposites for High Performance Lithium-Ion Batteries

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