Juan Luis Gómez Urbano

Friedrich Schiller University Jena | FSU · Institute for Technical and Environmental Chemistry

This work introduces a novel electrolyte comprising lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt dissolved in bio‐based γ‐valerolactone (GVL) for lithium‐ion batteries (LIBs). Moreover, a simple and sustainable aqueous‐based recycling approach for recovering the imide‐based lithium salt is proposed. Beyond the sustainable origin of the...

This work focuses on the combination of two strategies to improve the safety of lithium‐ion batteries: The use of a glyoxylic‐acetal, 1,1,2,2‐tetraethoxyethane, in the solvent blend to reduce the flammability of the liquid electrolyte and further its confinement inside of a methacrylate‐based polymer matrix, to prevent electrolyte leakage from the...

In this work we have derived the parameters of an AMOEBA‐like polarizable forcefield for electrolytes based on tetramethoxy and tetraethoxy‐glyoxal acetals, and propylene carbonate. The resulting forcefield has been validated using both ab‐initio data and the experimental properties of the fluids. Using molecular dynamics simulations, we have inves...

Herein, the design of novel and safe electrolyte formulations for high‐voltage Ni‐rich cathodes is reported. The solvent mixture comprising 1,1,2,2‐tetraethoxyethane and propylene carbonate not only displays good transport properties, but also greatly enhances the overall safety of the cell thanks to its low flammability. The influence of the condu...

A novel fluorine‐free electrolyte comprising a solution of lithium bis(oxalato)borate in ethyl isopropyl sulfone is presented. It is characterized by its safety and non‐toxic properties, along with the capability to effectively suppress the anodic dissolution of aluminum. Successful high‐temperature application of this electrolyte in combination wi...

In this work, the properties of a novel electrolyte based on the combination of bio‐based ƴ‐valerolactone (GVL) solvent with lithium bis(oxalato)borate (LiBOB) salt and its use for lithium‐ion capacitors (LICs) are presented. It is shown that the 1 m LiBOB in GVL electrolyte displays good transport properties, high thermal stability, and the abilit...

The increasing demand for electrical energy storage makes it essential to explore alternative battery chemistries that overcome the energy-density limitations of the current state-of-the-art lithium-ion batteries. In this scenario, lithium-sulfur batteries (LSBs) stand out due to the low cost, high theoretical capacity, and sustainability of sulfur...

Hard carbons are promising anode materials for lithium, sodium and potassium‐ion batteries attending to their low cost, simple processing technology and outstanding electrochemical performance. However, their complex structure and controversial carrier‐ion storage mechanisms makes difficult the prediction of their performance. Herein, we investigat...

In this work we report the synthesis of a non‐graphitizable carbon through a cost‐effective pyrolysis of a brewery waste product. We demonstrate that it is possible to realize hard carbon with structural and morphological properties from an abundant biomass source with a suitable application in energy storage devices. Resulting hard carbon displays...

In this work, we investigate the potential of a novel carbon composite as an electrode for high-voltage electrochemical double-layer capacitors. The carbon composite was prepared following a sustainable synthetic approach that first involved the pyrolysis and then the activation of a precursor formed by winery wastes and graphene oxide. The composi...

The increasing demand for electrical energy storage requires the exploration of alternative battery chemistries that overcome the limitations of the current state‐of‐the‐art lithium‐ion batteries. In this scenario, lithium‐sulfur batteries stand out for their high theoretical energy density. However, several inherent limitations still hinder their...

Herein, we report a simplistic single-step synthesis of nitrogen-doped graphene decorated with tin particles suitable as a negative (battery-type) electrode for lithium-ion hybrid capacitors. An activated carbon derived from a graphene-carbon composite is used as a positive (capacitor-type) electrode. The excellent features of the nitrogen-doped gr...

In this work we report an easy and ecofriendly approach for the preparation of activated carbon‐graphene composites using cigarette filter wastes as precursor and evaluate its potential application as electrodes for high energy electrochemical capacitors. Graphene‐biowaste derived carbon composites are tested as active electrode materials in three...

The Cover Feature illustrates the ultrafast charge of a dual graphene lithium‐ion capacitor. The power density of this device is boosted due to the flat‐shaped morphology of the active materials and the phosphate functionalization of the negative electrode. More information can be found in the Article by G. Moreno‐Fernández, D. Carriazo and co‐work...

Graphene aerogels derived from a biomolecule‐assisted aqueous electrochemical exfoliation route are explored as cathode materials in sodium–oxygen (Na–O2) batteries. To this end, the natural nucleotide adenosine monophosphate (AMP) is used in the multiple roles of exfoliating electrolyte, aqueous dispersant, and functionalizing agent to access high...

Herein, we report an easy approach for the preparation of graphene‐based materials suitable as electrodes for lithium‐ion capacitors (LICs). To the best of our knowledge, this is the first time that phosphorus‐functionalized graphene oxide (rGO800‐P) is used as negative (battery‐type) electrode in LICs technology. An activated carbon derived from t...

The mechanisms behind enhanced charge storage of P-functionalized carbons are unraveled for the first time using non-porous graphene oxide treated with phosphoric acid and annealed at either 400 or 800 °C. The electrochemical study in 1M H2SO4 reveals that phosphorus groups boost charge storage and electrochemical stability, with more effect for th...

The depletion of fossil fuels, the rapid evolution of the global economy, and high living standards require the development of new energy‐storage systems that can meet the needs of the world's population. Metal–oxygen batteries (M=Li, Na) arise, therefore, as promising alternatives to widely used lithium‐ion batteries, due to their high theoretical...

Herein we report an easy, ecofriendly and cheap synthetic approach for the preparation of carbon composites from the pyrolysis and activation of coffee waste and graphene oxide, and their evaluation as potential electrodes for lithium ion capacitors (LICs). An exhaustive optimization of some important parameters such as particle size, electronic co...

Correction for ‘Flat-shaped carbon–graphene microcomposites as electrodes for high energy supercapacitors’ by Gelines Moreno-Fernández et al. , J. Mater. Chem. A , 2019, 7 , 14646–14655.

Herein, we report a simple approach for the preparation of phosphate-functionalized carbonaceous graphene-based composites. The homogeneous deposition of a thin layer of phenolic resin on the surface of graphene oxide (GO) sheets was achieved using phosphoric acid as the polymerization catalyst and functionalization agent. Subsequent pyrolysis of t...

Highly packed films of reduced graphene oxide and sugar-based carbon nanospheres (CNSs) were prepared by a simple hydrothermal treatment. Under hydrothermal conditions, graphene oxide was partially reduced and self-assembled forming a monolith that effectively embedded the CNSs. The spheres were homogeneously distributed within the films, that had...

Herein we report a simple approach for the preparation of graphene oxide-carbon nanotube-sulfur composites. The self-standing composites can be easily prepared by freeze drying a frozen graphene oxide-carbon nanotube suspension, and then impregnated with sulfur by melt diffusion. Composites obtained in this way are physicochemically characterized b...

Fundamental understanding of the physical phenomena and electrochemical reactions occurring in metal-air batteries is critical for developing rational approaches towards high-performing Na–O2 battery cathodes. In this context, air cathode porosity plays a key role on battery performance, influencing oxygen supply and hence oxygen reduction and evol...

Lithium-sulfur batteries (Li-S) are identified as one of the most promising rechargeable energy systems due to their high theoretical capacity, high gravimetric energy density, low cost and low environmental impact. However, the insulating nature of sulfur and the migration of soluble polysulfides during discharge limit their practical application....

Most of the Li-S research has been devoted towards new materials with high areal capacity and cycling stability, especially different types of carbon with various porosity and morphology, providing significant progress in cell performance [1]. Graphene and reduced graphene oxide (rGO) composites with S have demonstrated improved electrochemical per...