scholarly journals Facile Construction of Hierarchical TiNb2O7/rGO Nanoflower With Robust Charge Storage Properties for Li Ion Batteries via an Esterification Reaction

2021 ◽  
Vol 9 ◽  
Author(s):  
Lei Hu ◽  
Xulai Yang ◽  
Yumeng Chen ◽  
Lili Wang ◽  
Jiajia Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Ionic Conductivity ◽  
Raw Materials ◽  
Critical Role ◽  
Electronic Conductivity ◽  
Esterification Reaction ◽  
Solvothermal Reaction ◽  
Graphene Oxide Nanosheets ◽  
Transport Path ◽  
Li Ion

TiNb2O7 (TNO) compound has been pursued tremendously due to its high theoretical capacity, high potential, and excellent cycle stability. Unfortunately, an intrinsic low electronic and ionic conductivity feature has restricted its broad applications in electrochemical energy storage fields. Two-dimensional (2D) nanostructures can effectively shorten Li-ion transport path and enhance charge transfer. Here, hierarchical structure TNO was constructed by using ethanol and acetic acid as particularly important organic chemicals of basic raw materials via a simple solvothermal reaction. Ethanol was found to play a critical role in the formation of 2D sheet structure. Meantime, reduced graphene oxide nanosheets can effectively improve electronic conductivity. As-obtained TiNb2O7 were wrapped further by graphene oxide nanosheets through a flocculation process. Their unique structure is beneficial to the final electrochemical performance. This study not only provides a general approach for the design of novel 2D nanomaterials wrapped by graphene because of the advantage of esterification reaction and flocculation reaction, but also improves the electronic and ionic conductivity simultaneously.

Micro-Structural Design of Soft Solid Composite Electrolytes with Enhanced Ionic Conductivity

2022 ◽  
pp. 1-12
Author(s):  
Nastran Khodabandehloo ◽  
Kosar Mozaffari ◽  
Liping Liu ◽  
Pradeep Sharma
Keyword(s):  
Ionic Conductivity ◽  
Solid Electrolytes ◽  
Numerical Solutions ◽  
Critical Role ◽  
Theoretical Framework ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Stretchable Electronics ◽  
Composite Electrolyte ◽  
Li Ion

Abstract Electrolyte in a rechargeable Li-ion battery plays a critical role in determining its capacity and efficiency. While the typically used electrolytes in Li-ion batteries are liquid, soft solid electrolytes are being increasingly explored as an alternative due to their advantages in terms of increased stability, safety and potential applications in the context of flexible and stretchable electronics. However, ionic conductivity of solid polymer electrolytes is significantly lower compared to liquid electrolytes. In a recent work, we developed a theoretical framework to model the coupled deformation, electrostatics and diffusion in heterogeneous electrolytes and also established a simple homogenization approach for the design of microstructures to enhance ionic conductivity of composite solid electrolytes. Guided by the insights from the theoretical framework, in this paper, we ex- amine specific microstructures that can potentially yield significant improvement in the effective ionic conductivity. We numerically implement our theory in the open source general purpose finite element package FEniCS to solve the governing equations and present numerical solutions and insights on the effect of microstructure on the enhancement of ionic conductivity. Specifically, we investigate the effect of shape by considering ellipsoidal inclusions. We also propose an easily manufacturable microstructure that increases the ionic conductivity of the composite electrolyte by forty times, simply by the addition of dielectric columns parallel to the solid electrolyte phase.

scholarly journals Unveiling BiVO4 nanorods as a novel anode material for high performance lithium ion capacitors: beyond intercalation strategies

2018 ◽  
Vol 6 (14) ◽  
pp. 6096-6106 ◽  
Author(s):  
Deepak P. Dubal ◽  
Kolleboyina Jayaramulu ◽  
Radek Zboril ◽  
Roland A. Fischer ◽  
Pedro Gomez-Romero
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Power ◽  
High Performance ◽  
Lithium Ion ◽  
High Energy ◽  
High Power Density ◽  
Graphene Oxide Nanosheets ◽  
Reduced Graphene ◽  
Li Ion

A high energy and high power density Li-ion capacitor based on BiVO4 nanorods (left) and partially reduced graphene oxide nanosheets (PRGO, on right) for EV applications.

Synthesis and Photo-Catalytic Performance of ZnO/Graphene Composites

2014 ◽  
Vol 633 ◽  
pp. 103-106 ◽  
Author(s):  
Cai Xia Li ◽  
Xiao Dong Zhang ◽  
Dan Yu Jiang ◽  
Qiang Li
Keyword(s):  
Graphene Oxide ◽  
Zinc Acetate ◽  
Degradation Rate ◽  
Raw Materials ◽  
Catalytic Performance ◽  
Solvothermal Reaction ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
Photo Degradation ◽  
Transmission Electron

Zinc acetate dehydrate and Graphene oxide (GO) were employed as raw materials, the ZnO/Graphene composites were simply and quickly synthesized by solvothermal reaction at 180°C for 12 h. The phase structure and morphologies of the as-obtained composites were characterized and observed by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). Using RhB solution simulated dye wastewater, the composites’ photo-catalytic performance were preliminary tested and observed with the visible light irradiation. The results indicated that the concentrations of zinc acetate and the mass ratio of zinc acetate dihydratio and graphene oxide all had an impact on the photo-degradation rate. The photo-degradation rate of the composites prepared with the concentrations of zinc acetate of 0.01 mol/L was higher than that of zinc acetate of 0.001 mol/L. The mass ratio of zinc acetate dehydratio and graphene oxide of 4:1 was higher than that of 8:1.

PVdF-HFP/exfoliated graphene oxide nanosheet hybrid separators for thermally stable Li-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (84) ◽  
pp. 80706-80711 ◽  
Author(s):  
Yunah Choi ◽  
Kan Zhang ◽  
Kyung Yoon Chung ◽  
Dong Hwan Wang ◽  
Jong Hyeok Park
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Thermally Stable ◽  
Li Ion Batteries ◽  
Graphene Oxide Nanosheets ◽  
Exfoliated Graphene ◽  
Graphene Oxide Nanosheet ◽  
Li Ion ◽  
Thermal Stability Of

The inclusion of 2-dimensional graphene oxide nanosheets could enhance the mechanical and thermal stability of polymer separators for Li-ion batteries.

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