Design and characterization of a polymer/oxide hybrid electrolyte for Li|NMC622 battery application
Lithium metal is among the most promising anode materials for high energy battery application [1] but is known to eventually suffer from dendrite growth upon cycling. Thus, research efforts to prevent inhomogeneous lithium deposits including exploitation of solid electrolytes increased over the last years. While oxide-based electrolytes feature high ionic conductivity and oxidative stability, polymer […]
Ultra-thick cathodes based on Aluminium metal foams as current collector for high energy Li-ion batteries
The demand for Li-ion batteries with ever increasing energy and power density applies not only for automotive applications. Inter alia, high energy density and mechanical stability together with small electrode and cell dimensions are required for medical technology systems and wearable devices. Thus, increasing the areal loading of electrodes is necessary to meet the demands. […]
Influence of recuperation currents on battery lifetime in electric bus applications
Recuperation is an important measure for extending the daily range of electric vehicles. It plays a major role in the transportation sector to return non-needed kinetic energy of the large moving masses back into the electrical systems during breaking. For customers are reliable lifetime estimations very important. Their usage profiles must be analyzed. The aging […]
Highly toxic Organofluorophosphates as Electrochemical Aging Products during Formation at 4.8 V in NCM622/SG-3 Lithium Ion Batteries
Organofluorophosphates (OFPs) have been reported to pose substantial health hazards due to their structural similarities to pesticides and nerve agents. Formation of OFPs in lithium ion batteries (LIB) due to hydrolysis of the conducting salt lithium hexafluorophosphate (LiPF6) and thermal stress has been discussed in literature. The electrochemical formation of OFPs in commercially available as […]
Real World Load Cycle Based State of Charge Estimation Using Neural Network
In this study a neural network for state of charge (SoC) estimation of a lead acid battery was developed. The network structure is based on a nonlinear autoregressive neural network (NARX). This network structure assures consistent SoC behaviour over time without oscillations. The network has three hidden layers and a feedback loop for the SoC. […]
Quasi-In-Situ Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy during Cyclic and Calendaric Aging of Silicon Nanoparticle Anodes
Obtaining a detailed understanding of cyclic and calendaric aging is essential for confronting the challenges of silicon anodes. Recent developments in in situ and in operando scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques showed insights into the volume expansion and associated crack formation during de-/lithiation of silicon. Due to the high vacuum […]
ICP-OES for the investigation of reaction and aging mechanisms in aqueous acidic Zn-MnO2 batteries
The research on alternative battery technologies is getting more and more attention in the recent years. Among others, the aqueous rechargeable Zn-MnO2 battery (ARZMB) chemistry is a promising candidate, especially in the field of stationary applications with high requirements in terms of safety, environmental friendliness, material availability, long-term stability and specific energy costs. However, the […]
Electrochemical Noise Measurement for Non-Invasive Sensors
Electrochemical Noise is a benign method that uses no excitation. The technique is based on simple measurement of current or voltage, without any perturbations. Originally developed exclusively for monitoring stochastic corrosion, it is currently under development for studying effects in batteries. Use of metallic lithium provides increased voltage and energy density, it is therefore very […]
Development and Investigation of State of Energy Algorithms in a Model-in-the-Loop Toolchain
Due to ongoing global warming and increasing air pollution, it is imperative to shift from fossil fuels to renewable energy sources. In this context, Electrical Energy Storage Systems play a central role in both grid stabilization and the long-term establishment of battery electric vehicles (BEVs) and consequently make a significant contribution to widespread decarbonization. Lithium-ion […]
New Insights using Isothermal Calorimetry and High Precision Cycling
In-operando isothermal calorimetry is a powerful tool for the study of active materials for energy storage. It has been used to study positive [1–3] and negative [4–7] electrode materials in half cells, as well as in symmetrical [4,5] and full cells.[8–15] Calorimetry can be used to quantify parasitic reactions enabling lifetime predictions but also identify […]