Influence of shaping process of natural graphite particles on electrode kinetics
Graphite-based anodes represent the state-of-the-art in the current Li-ion battery technology. [1] However, the kinetic limitations of Li intercalation affect the overall cell performance during operation at relatively high charging rates or low-temperature. Due to the ever-growing market request of LiBs with fast-charging properties, especially for automotive applications, many efforts have been addressed to develop […]
Laser-based surface modification of high energy graphite anodes for lithium-ion batteries to improve the wettability and rate capability
Many battery applications require both, a high energy and a high power density. Reflecting electric vehicles, that represents a high driving range with a fast charging option. To increase the energy density of lithium-ion batteries, it is common practice to reduce passive material of the battery by producing electrodes with high active material layer thickness […]
Calendar aging and post-mortem analysis of NCA/Si-graphite 18650 lithium-ion batteries
Lithium-ion batteries have emerged as a key enabler for a sustainable energy system. Their wide applications in electrification of traffic and the storage of fluctuating renewable energy require more and more performance in terms of safety, lifetime, energy density, costs and so on. Recently, silicon-based materials have been widely introduced in the anode of commercial […]
Electrical Network Structures in Lithium-Ion Batteries: Model-based Assessment of Uncertainty and Capacity Fade
This poster presents a hybrid model approach that is applied to assess the effect of the electrical network structure on the electrochemical performance and degradation of a lithium-ion battery. Therefore, the novel model combines a classical electrochemical model based on porous electrode theory with an electrical network model. This enables to investigate of the influence […]
Morphological study of cobalt free cathode materials from co-precipitated spherical MnxNi1-x(OH)2 precursors
Lithium-ion batteries are currently the most important electrochemical energy storage systems for electric vehicles and intermediate storage of renewable energies. Forecasts indicate a dramatic increase in the storage demand for the next decades, associated directly with an increasing demand in the respective raw materials. Lithium, cobalt and natural graphite are already listed as critical raw […]
Optimization of Silicon-Graphite Anode and Chitosan Binder Material for Lithium-ion Batteries
One of the promising approaches towards designing high energy density lithium-ion batteries (LIBs) involves the use of high-capacity anode materials. A blend of silicon (Si), with a high lithiation capacity of 3590 mAh/g (Li3.75Si) at room temperature, and graphite (Gr), endowed with limited volume change during the charge/discharge process and superior electric conductivity, presents the […]
Analytical Transmission Electron Microscopy studies of LiNi0.33Mn0.33Co0.33O2, LiCoO2, and silicon electrode materials for lithium-ion batteries
The modification of state-of-the-art electrode materials by nanostructured coatings is one approach to optimize crucial parameters for applications, such as the electronic conductivity or the mechanical stability of the electrode materials. In general, interfaces (e.g. active material/coating; electrode surface/electrolyte) determine the local Li ion transport kinetics and finally the electrochemical cell performance in terms of […]
Investigations on the synthesis of NCM111 and NCM811 by operando XRD
Ni-containing lithium transition metal oxides such as NCMs (LiNixCoyMn1-x-yO2, 0 ≤ x, y ≤1.0) are one of the most promising candidates for the positive electrode in the next-generation lithium-ion batteries (LIBs) due to their high specific capacity (over 220 mAhg-1) [1-5]. However, Ni/Li disorder in octahedral sites still restricts the electrochemical performance, which burdens the […]
Comparison of ageing behaviour of high power LFP and NCA batteries
Analysis and prediction of the state of health (SOH) is essential for the improvement of lithium-ion batteries. For this purpose, non-invasive techniques are an interesting tool. Electrochemical impedance spectroscopy (EIS) and differential voltage analysis (DVA) provide detailed information about ageing mechanism occurring in lithium-ion batteries [1, 2]. DVA indicates how lithium-ion batteries lose capacity. It […]
Optimization of Silicon-Graphite Anode and Chitosan Binder Material for Lithium-ion Batteries
One of the promising approaches towards designing high energy density lithium-ion batteries (LIBs) involves the use of high-capacity anode materials. A blend of silicon (Si), with a high lithiation capacity of 3590 mAh/g (Li3.75Si) at room temperature, and graphite (Gr), endowed with limited volume change during the charge/discharge process and superior electric conductivity, presents the […]