Investigation of Iron-Additives for Low-Temperature Graphitization of Coffee Ground and its Application in LIBs
Graphite is the state-of-the-art negative electrode material (anode) for lithium-ion batteries (LIBs) and will likely dominate the anode market in the form of either natural graphite (NG) or synthetic graphite (SG) for at least the next decade. However, while NG is a limited source and is declared as “critical” raw material by the European Union, […]
Physical Vapor Deposition of Metallic Lithium Layers and Lithiated Silicon Layers for High-Performance Anodes
Currently, significant worldwide research activities are carried out to accomplish more efficient energy storage methods and to overcome challenges in using regenerative energy continuously. For Li-ion batteries, the volumetric energy density may be increased considerably by substituting conventional graphite anodes with materials based on Si and also in prospective by metallic Li. However, there is […]
Ragone Calculator: A Straightforward Tool to Determine Performance Metrics and Support Developments at an Application-Relevant Level
Science and industry worldwide are conducting intensive research into various ways to improve existing battery concepts or transferring novel concepts to application. The development of materials and electrodes is an essential step in this process. However, the evaluation of the achievolumetric energy density performance parameters and the comparison of the different studies at this technological […]
An experimental comparison between commercial lithium-ion pouch and experimental cells
The dynamic performance of lithium-ion cells depends strongly on the underlying loss processes such as contact resistances, charge transfer and diffusive processes. The combination of these processes defines the frequency depending impedance behaviour. A well-known characterisation method for the impedance of electrochemical systems, such as lithium-ion cells, is the electrochemical impedance spectroscopy (EIS). However, in […]
Dual lithium salts mediated lithium transfer in viscous cellulose acetate gel-polymer electrolyte
Since gel polymer electrolytes (GPEs) have been introduced by Feuillade and Perche in 1975 [1], the studies on electrolytes based on biopolymers have been actively progressed due to the desirable properties of biopolymers and the concern on environmental issues. Furthermore, GPEs enable improved safety and mechanical stability as well as design flexibility, which meet the […]
Volume and Thickness Change of NMC811|SiOx Graphite large format Lithium Ion Cells: from Pouch Cell to Active Material Level
The reversible thickness change of a large-format lithium-ion automotive pouch cell was investigated under precisely monitored cell pressure and temperature using an in-house built actively controlled pneumatic cell press. The quantitative and qualitative contribution of the state-of-the-art NMC811 cathode and the SiOx-graphite composite anode to the total pouch cell expansion was resolved by electrochemical dilatometry […]
A Toolchain for Evaluating SoX Algorithms on an Embedded System (using the foxBMS Plattform)
With the increasing amount of battery storage systems, the demand for monitoring the status of these systems is increasing to ensure safe and better usage of the batteries. Many algorithms can be found in the literature varying in their accuracy and complexity to determine the State of Charge (SoC) or the State of Health (SoH). […]
The influence of temperature inhomogeneity on cycling characteristics and local aging behavior of lithium-ion battery cells
With the rapid development of electric vehicles worldwide, high energy density, fast charging and high safety have become the core requirements of current power battery technology. Under this demand, the existing technology is gradually relying on large-volume batteries in order to increase the energy density and to shorten the charging time through high charging rates. […]
The influence of temperature inhomogeneity on cycling characteristics and local aging behavior of lithium-ion battery cells
With the rapid development of electric vehicles worldwide, high energy density, fast charging and high safety have become the core requirements of current power battery technology. Under this demand, the existing technology is gradually relying on large-volume batteries in order to increase the energy density and to shorten the charging time through high charging rates. […]
Safety and operational strategies of lithium-based batteries – dendrite and SEI growth on metallic lithium
The aim of this work is to use the empirical findings and parameters obtained from the experimental procedures to model these processes on a physical-electrochemical basis. A prerequisite for the development of the mathematical model of the new energy storage devices with lithium metal electrodes is the experimental analysis characterizing the electrochemical and chemical properties […]