A5002510168- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Advanced battery technologies research
- Supercapacitor Materials and Fabrication
- Thermal Expansion and Ionic Conductivity
- Graphene research and applications
- Inorganic Chemistry and Materials
- Ionic liquids properties and applications
- Recycling and Waste Management Techniques
Karlsruhe Institute of Technology
2015-2022
Helmholtz-Institute Ulm
2015-2022
Abstract Aqueous Na‐ion batteries may offer a solution to the cost and safety issues of high‐energy batteries. However, substantial challenges remain in development electrode materials electrolytes enabling high performance long cycle life. Herein, we report characterization symmetric battery with NASICON‐type Na 2 VTi(PO 4 ) 3 material conventional aqueous “water‐in‐salt” electrolytes. Extremely stable cycling for 1000 cycles at rate (20 C) is found highly concentrated owing formation...
Abstract Increasing the environmental benignity of lithium‐ion batteries is one greatest challenges for their large‐scale deployment. Toward this end, we present herein a strategy to enable aqueous processing high‐voltage LiNi 0.5 Mn 1.5 O 4 (LNMO) cathodes, which are considered highly, if not most, promising realization cobalt‐free next‐generation cathodes. Combining addition phosphoric acid with cross‐linking sodium carboxymethyl cellulose by means citric acid, aqueously processed...
Abstract Electrolytes based on organic carbonates are widely used for sodium‐ion batteries (SIBs) due to several advantages such as high ionic conductivity, wide liquidus range, and electrochemical stability. In this work, class of electrolyte is investigated focusing two conductive salts, namely NaPF 6 (sodium hexafluorophosphate) NaTFSI bis(trifluoromethanesulfonyl)imide), using PC (propylene carbonate) solvent. The investigation different salt concentrations, from rather diluted highly...
This work elucidates the manufacturing of lithium titanate (Li4Ti5O12, LTO) electrodes via aqueous process using sodium carboxymethylcellulose (CMC), guar gum (GG) or pectin as binders. To avoid aluminum current collector dissolution due to rising slurries’ pH, phosphoric acid (PA) is used a pH-modifier. The are characterized in terms morphology, adhesion strength and electrochemical performance. In absence acid, hydrogen evolution occurs upon coating slurry onto substrate, resulting...
Abstract The effect of various electrolyte additives (fluoroethylene carbonate (FEC), vinylene (VC), and propane sultone (PS)) on the performance LiNi 0.5 Mn 0.3 Co 0.2 O 2 (NMC532) electrodes in combination with lithium (half‐cell) graphite (full‐cell) negative electrodes, is herein reported. cathode/electrolyte interface (CEI) layer formed NMC532 electrode cycled up to 4.5 V versus Li + /Li investigated by X‐ray photoelectron spectroscopy scanning electron microscopy. This allows...
A novel membrane based on silicon dioxide (SiO₂) and hydroxypropyl guar gum (HPG) as binder is presented tested a separator for lithium-ion batteries. The made with renewable low cost materials an environmentally friendly manufacturing processing using only water solvent. offers superior wettability high electrolyte uptake due to the optimized porosity good affinity of SiO₂ microstructure towards organic liquid electrolytes. Additionally, shows thermal stability no dimensional-shrinkage at...
Abstract The sequence of initial cycles necessary for the build‐up solid electrolyte interphase (SEI) on anode surface Li‐ion batteries (usually called formation) is a cost‐ and time‐consuming process, thus requiring further optimization. Herein, three different protocols are compared to explore possibilities reduce formation time cells without negatively affecting electrochemical performance. XPS HRTEM analyses used identify main characteristics as formed SEIs. Electrochemical tests...
Low-cost and environmentally-friendly materials are investigated as carbon-coating precursors to modify the surface of commercial graphite for Li-ion battery anodes. The coating procedure final carbon content tuned study influence on electrochemical performance graphite. Thermogravimetric analysis (TGA) Brunauer–Emmett–Teller (BET) area used characterize area, respectively, whereas X-ray diffraction (XRD) Raman spectroscopy allow tracking graphite’s structural changes amorphization. In...
Aluminum, a cost-effective and abundant metal capable of alloying with Li up to around 1000 mAh g-1 , is very appealing anode material for high energy density lithium-ion batteries (LIBs). However, despite repeated efforts in the past three decades, reports presenting stable cycling performance are extremely rare. This study concerns recent findings on highly reversible (de)lithiation micro-sized Al (m-Al) by using bis(fluorosulfonyl)imide (FSI)-based electrolytes. By this kind electrolyte,...
Herein, the post-mortem study on 16 Ah graphite//LiFePO4 pouch cells is reported. Aiming to understand their failure mechanism, taking place when cycling at low temperature, analysis of cell components taken from different portions stacks and positions in electrodes, performed by scanning electron microscopy (SEM), X-ray diffraction (XRD) photoemission spectroscopy (XPS). Also, recovered electrodes are used reassemble half-cells for further cycle tests. The combination several techniques...
Silicon has become an integral negative electrode component for lithium-ion batteries in numerous applications including electric vehicles and renewable energy sources. However, its high capacity low cycling stability represent a significant trade-off that limits widespread implementation fractions the electrode. Herein, we assembled high-capacity (1.8 Ah) cells using nanoparticulate silicon–graphite (1:7.1) blend as material LiFePO4–LiNi0.5Mn0.3Co0.2O2 (1:1) positive Two types of were...
The effect of electrolyte additives on the LiNi0.5Mn0.3Co0.2O2 surface film formation in lithium metal and lithium-ion cells is investigated. A comprehensive XPS study cathode/electrolyte interface layer formed electrodes cycled up to 4.5 V, elucidates chemical composition, thickness morphology evolution with different electrolytes allowing a correlation between nature electrochemical performance. More details can be found article number 1901500 by Ivana Hasa, Stefano Passerini, co-workers.
The Cover Feature shows a complementary strategy to enable the aqueous processing of high-voltage LiNi0.5Mn1.5O4 cathodes for greener and more sustainable lithium-ion batteries. synergistic combination phosphoric acid crosslinked sodium carboxymethyl cellulose (by means citric acid) provides electrodes with improved capacity, coulombic efficiency, cycling stability. Notably, this approach can be easily incorporated into standard electrode preparation procedures, not requiring any additional...