Balancing group deviation & balancing energy costs due to the provision of frequency containment reserve with a battery storage system in Germany
The energy transition in the electrical energy supply sector is leading to a steadily increasing share of fluctuating renewable energy sources in the power grid. Thus, control reserves such as frequency containment reserve are gaining in importance and need further investigation. In Germany, the power grid is divided into balancing groups, in which supply and […]
Towards Optimized Electrolyte Formulations for Radical Polymer-based Dual-Ion Batteries
Lithium ion batteries are unrivaled in terms of specific energy or energy density. However, the fulfillment of other properties like enhanced sustainability, safety, abundancy of the used materials and lower costs have to be brought into focus nowadays due to crucial importance of environmental and climate issues. A promising approach to head towards a more […]
Quantitative Homogeneity Determination of the Solid Electrolyte Interphase After High Temperature Cycling
In lithium batteries, the solid electrolyte interphase (SEI) at the negative electrode | electrolyte interface must passivate the electrode surface from ongoing electrolyte decomposition. It must not, however, decelerate interface kinetics to a major extent. In that regard, an effective SEI governs cell performance if it possesses the optimal set of electrical and mechanical properties. […]
Proportionate Influence of Anode and Cathode Structuring on Electrode Characteristics and Cell Performance
Lithium-ion batteries (LIBs) are currently the dominating energy storage solution for most consumer electronics and electromobility applications. For an increased market penetration, further enhancements of the cell performance of LIBs are needed. Microscopic diffusion channels in the coatings of battery electrodes are a promising approach to improve the (dis)charge performance and increase the lifetime of […]
Thermal characterization of a fiber Bragg grating sensor array for measuring absolute surface temperature on a pouch cell
Thermal monitoring of a lithium-ion pouch cell is essential for safe use. [1] Until now, the temperature has only been monitored at a few preselected points in a battery module and passed on to the battery management system (BMS). The BMS controls the operation of all the cells in a battery pack. It prevents over-charging, […]
Radial Thermal Conductivity Measurements of Cylindrical Lithium-Ion Batteries – An Uncertainty Study of the pipe method
A typical method for measuring the radial thermal conductivity of cylindrical objects is the pipe method. This method introduces a heating wire in combination with standard thermocouples and optical Fiber Bragg grating temperature sensors into the core of a cell. This experimental method can lead to high uncertainties due to the slightly varying setup for […]
Effect of charging rate on Arrhenius plots describing optimum cycle life for pouch and cylindrical cells
Effect of Charging Rate on Arrhenius Plots describing Optimum Cycle Life for Pouch and Cylindrical Cells[1] Temperature affects the chemical reactions in a Li-ion battery and consequently influences the aging rate of the cell [2,3]. Two temperature dependent mechanisms influence the aging on the anode side: solid electrolyte interface (SEI) growth at high temperatures and […]
Introducing the Synthetic Battery Modeling Toolchain
Future materials are frequently published in the scientific literature to be used as cathode or anode active materials, separators or electrolytes. The influence of these future materials on the actual cell performance can not be easily estimated from the material properties. However, since constructing a prototype is time- and money-intensive, it is advantageous to make […]
Substandard? Lithium-ion cells available on online marketplaces
Access to up-to-date information on lithium-ion cells is crucial for a wide range of academic research areas. However, researchers generally do not have access to the latest cells from large manufacturers and therefore have to rely cells available on online marketplaces. To quantify the state of these cells, we collected data on 495 unique cells […]
Assessment of coating defect criticality in lithium-ion battery electrodes
State-of-the-art battery production suffers from high scrap rates, which are reported to range between 5 % and 30 % or even more, depending on the manufacturer [1,2]. Lowering these rates will be required in order to reach strategic targets, such as battery prices of less than 100 € kW h-1. Scrap may originate from various […]