Habtom Desta Asfaw

Habtom Desta Asfaw
Uppsala University | UU · Department of Chemistry - Ångström Laboratory

Doctor of Philosophy (PhD) in Materials Chemistry ( and Electrochemistry)

About

44
Publications
5,579
Reads
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334
Citations
Citations since 2017
22 Research Items
287 Citations
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20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Additional affiliations
March 2019 - present
Uppsala University
Position
  • Researcher
Description
  • Researcher with expertise in lithium ion batteries, supercapacitors and carbon materials.
August 2018 - January 2019
Empa - Swiss Federal Laboratories for Materials Science and Technology
Position
  • PostDoc Position
Description
  • Thin film deposition of solid state battery materials and devices
May 2017 - August 2018
Imperial College London
Position
  • PostDoc Position
Education
October 2012 - March 2017
Uppsala University
Field of study
  • Materials Chemistry
October 2012 - May 2015
Uppsala University
Field of study
  • Materials Chemistry
February 2012 - September 2012
Uppsala University
Field of study
  • Materials for Energy Storage and Conversion

Publications

Publications (44)
Article
Full-text available
In this article, we report a novel 3D composite cathode fabricated from LiFePO4 nanoparticles deposited conformally on emulsion-templated carbon foam by a sol-gel method. The carbon foam is synthesized via a facile and scalable method which involves the carbonization of a high internal phase emulsion (polyHIPE) polymer template. Various techniques...
Article
Full-text available
A Li-ion microbattery comprising three-dimensional (3D) electrodes of different geometries is reported. While aluminum nanorods are used as the negative electrode a 3D carbon matrix with a larger surface area is used as support for the LiFePO4 positive electrode to compensate for the difference in the specific energy densities between LiFePO4 and A...
Article
Full-text available
High surface area carbon foams were prepared and characterized for use in 3D structured batteries. Two potential applications exist for these foams: firstly as an anode and secondly as a current collector support for electrode materials. The preparation of the carbon foams by pyrolysis of a high internal phase emulsion polymer (polyHIPE) resulted i...
Article
This article offers insight into the role of binders in the overall performance of a dual-ion battery (DIB). Replacing sodium carboxymethyl cellulose (CMC) with poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) enhances the interfacial stability of a graphite positive electrode in a DIB. Electrochemical testing combined with X-ray photoel...
Article
Layered oxide cathode materials with the general formula NaxTMO2 (TM = transition metals) have shown promises as electrode materials for future large-scale sodium-ion batteries. However, several challenges including capacity degradation at high voltage, phase transitions as well as structural sensitivity to minor changes in the sodium and transitio...
Article
Full-text available
Biomass is a sustainable precursor of hard carbons destined for use in sodium-ion batteries. This study explores the synthesis of hard carbon nanosheets from oxidized cork and impact of synthesis temperature on the hard carbon characteristics. An increase in the carbonization temperature from 1000 to 1500 °C generally leads to lower BET specific su...
Article
Full-text available
Dual-Ion Batteries A novel battery concept reliant on a dual-ion intercalation mechanism is demonstrated in article 2100122 by Antonia Kotronia, Habtom Desta Asfaw, and co-workers. Using glass fiber fabrics infused with an ionogel electrolyte, a compact dual-ion battery (DIB) is demonstrated. The potassium-based salts used in the electrolyte make t...
Article
Full-text available
Anion intercalation in the graphite cathode of a dual-ion battery (DIB) occurs at unusually high voltage (>4.5 V K⁺/K). This exacerbates electrolyte degradation and corrosion of Al current collectors, leading to poor coulombic efficiency (CE), typically <90%, and short cell life as a result. These limitations can be mitigated if a stable cathode-el...
Article
Full-text available
A dual‐ion battery (DIB) is an emerging technology destined for use in stationary energy storage applications. Most DIB prototypes use expensive salt‐concentrated liquid electrolytes to ensure sufficient ion supply and an electrochemical stability window beyond 4.5 V, which is required for anion intercalation in graphite. Herein, the design of a co...
Article
Full-text available
An important factor in the development of sodium-ion batteries (SIBs) is the use of cheap and sustainable materials. Sodium lignosulfonate, a lignin derivative, is demonstrated here as an attractive, “green”, water-soluble, and potentially cost-effective binder for use in hard carbon anodes for SIBs. A comparison of its battery cycling performance...
Article
Full-text available
The electrochemical performance of negative active materials employed in sodium-ion batteries is dependent on the amount of Na+ available in the test cells. As such, electrodes that exhibit long cycle-life and high coulombic efficiency (CE) in half-cells could suffer from fast capacity fading in full-cells as a result of unstable solid electrolyte...
Article
Full-text available
Dual-ion batteries (DIBs) generally operate beyond 4.7 V vs Li+/Li0 and rely on the intercalation of both cations and anions in graphite electrodes. Major challenges facing the development of DIBs are linked to electrolyte decomposition at the cathode-electrolyte interface (CEI), graphite exfoliation, and corrosion of Al current collectors. In this...
Chapter
Anodic materials play a key role in the development of Li-ion batteries, as they influence their overall performances. Demand for improved energy and power densities, enhanced safety, and reduction in environmental impact have driven the attention toward progressive use of alternative materials with respect to state-of-the-art graphite. Developing...
Article
Full-text available
Hard carbons are the most promising negative active materials for sodium ion storage. In this work, a simple synthesis approach is proposed to produce hard carbon microspheres (with a mean diameter of ∼1.3 μm) from resorcinol-formaldehyde precursors produced via acid-catalyzed polycondensation reaction. Samples prepared at 1200, 1400 and 1500 oC sh...
Article
Full-text available
A long-range graphitic ordering in carbon anodes is desirable since it facilitates Li⁺ transport within the structure and minimizes irreversible capacity loss. This is of vital concern in porous carbon electrodes that exhibit high surface areas and porosity, and are used in 3D microbatteries. To date, it remains a challenge to graphitize carbon str...
Article
Full-text available
Three‐dimensional (3D) carbon electrodes with suitable microstructural features and stable electrochemical performance are required for practical applications in 3D lithium‐ion batteries. This article deals with the optimization of the microstructures and electrochemical performances of carbon electrodes derived from emulsion‐templated polymer foam...
Article
Full-text available
Porous electrodes are considered attractive for potential use as 3D current collectors in Li-ion microbatteries. Carbon foams, in particular, can be coated with a variety of active materials to prepare electrodes which can maximize energy and power density simultaneously. Modeling such electrodes will aid the selection of microstructural parameters...
Article
3D-microbatteries (3D-MBs) impose new demands for the selection, fabrication and compatibility of the different battery components. Herein, solid polymer electrolytes (SPEs) based on poly(trimethylene carbonate) (PTMC) have been implemented in 3D-MB systems. 3D electrodes of two different architectures, LiFePO4-coated carbon foams and Cu2O-coated C...
Article
P2-type NaMO2 sodiated layered oxides with mixed transition metals are receiving considerable attention for use as cathodes in sodium-ion batteries. A study on the solid solution P2-NaxCo1-y(Mn2/3Ni1/3)yO2 (y = 0, 1/3, 1/2, 2/3, 1) reveals that changing the composition of the transition metals affects the resulting structure and ability to synthesi...
Article
Effective utilization of active materials in micro-batteries can be enhanced by rational design of the electrodes. There is an increasing trend of using 3D electrodes that are coated in nanosized active materials to boost both energy and power densities. This article focuses on the fabrication of 3D electrodes based on monolithic carbon foams coate...
Article
The synthesis of two dimensional (2D) materials from transition metal oxides, chalcogenides, and carbides mostly involve multiple exfoliation steps in which hazardous solvents and reagents are used. In this study, hydrated vanadium pentoxide (V2O5·nH2O) nanosheets with a thickness of a few nanometers were prepared via a facile environmentally frien...
Article
Full-text available
The chemical phenomena occurring at the electrode-electrolyte interfaces profoundly determine the cycle behavior of a lithium ion battery. In this work, we report that silicon-based anodes can attain enhanced levels of capacity retention, rate performance and lifespan when a versatile protective layer of, F-doped anatase (TiO2-xFx), is applied towa...
Article
Research in microbatteries is stimulated by the need for miniature power sources for use in autonomous sensing, wireless communications, medical implants and other microscale devices (1-10 mm ³ ). 1, 2 In such applications wherein physical space is at premium, sufficiently small, yet powerful, energy storage devices are desired. Currently, either t...
Article
Hierarchically porous carbon foams with specific surface areas exceeding 600 m2 g−1 can be derived from polystyrene foams that are synthesized via water-in-oil emulsion templating. However, most styrene-based polymers lack strong crosslinks and are degraded to volatile products when heated above 400 oC. A common strategy employed to avert depolymer...
Article
Full-text available
For materials based on spatially varied conversion reaction, Li+ storage properties largely hinge on the rational design of the concurrent electronic and ionic pathways in the electrode. We herein present a scalable approach for integrating size-tunable Fe3O4 nanocrystals with hierarchical porous carbon foam by employing sulfonated high in-ternal p...
Article
We designed and fabricated a series of bicontinuous carbon foam/metal sulfide composite with hierarchical porosities as a high performance free-standing anode electrode for lithium ion batteries. The synthetic method involves the scalable nanocasting process of layered structured M x S (M=Fe, Sn, Cu) using the high internal phase emulsion polymer (...
Conference Paper
Microbattery research sparked from the rapid expansion and miniaturization of micromelectromechanical systems (MEMS) has recently produced a wide variety of different cell designs and electrode geometries. Three-dimensional (3D) electrodes are currently the most promising approach addressing the requirement of high energy and power density on a lim...
Article
Microbattery research sparked from the rapid expansion and miniaturization of micromelectromechanical systems (MEMS) has recently produced a wide variety of different cell designs and electrode geometries. Three-dimensional (3D) electrodes are currently the most promising approach addressing the requirement of high energy and power density on a lim...
Data
Full-text available
High surface area carbon foams were prepared and characterized for use in 3D structured batteries. Two potential applications exist for these foams: firstly as an anode and secondly as a current collector support for electrode materials. The preparation of the carbon foams by pyrolysis of a high internal phase emulsion polymer (polyHIPE) resulted i...

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