Electrode and Separator Extrusion
We present several approaches to produce electrodes and separators by extrusion and dry coating. COLLIN has built its first electrode coating line in 1999. Since then, we have improved our machines in many ways to deliver a complete solution to produce electrodes with less or even no solvent. The mixing of the electrode material can […]
Silicon-Carbon Composite-Based Anodes for Lithium-Ion Batteries
Silicon-carbon composites (Si/C) are considered as one of the most promising candidates for anode active materials in high energy lithium-ion batteries. This research activity aims to develop scalable manufacturing processes of novel Si/C-based anode materials for lithium-ion batteries. To achieve anodic active material with high cycling stability, silicon nanoparticles are encapsulated into a protective carbon […]
Investigation of mechanical stress and lithium distribution
Previous to the integration of li-ion batteries in different applications, the battery cells have to be fully characterized to assess their ability to deliver the desired power and energy over the cell’s lifetime. On this account, accelerated aging tests are conducted, which use, among oth-ers, high charge and discharge currents. While cycling cells with accelerated […]
Case Studies in Failure Analysis: Cell Quality Assessment and Root Cause Investigations
With the increasing number of battery powered devices on the market, battery safety is more important now than ever. Exponent works with battery and device manufacturers around the world to help make their products safer and more reliable. Through the use of both non-destructive and destructive techniques, device and battery manufacturers are able to determine […]
Generation of innovative Li2S@C active materials via plasma processes
Batteries become increasingly important as energy storage devices for a sustainable energy economy. In comparison to Lithium-ion batteries, Lithium sulfide (Li2S) as cheap, non-toxic cathode material with a high theoretical energy density, attracted significant attention. Since Li2S suffers from low ionic and electric conductivity as well as from volume changes during cell operation, it is […]
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 […]
Identifying battery storage system to ensure stable grid operation – the GridBatt project
The aim of the “GridBatt” project is to work out the special requirements when using a battery storage system to ensure stable grid operation, in order to adapt the storage system to the requirements already at the design stage, to optimally dimension it and to optimise its operation strategy. Only a holistic view of the […]
Using Degradation Modes for Large-scale Capacity and Power Fade Diagnostics
Battery degradation leads to the fade of capacity and power, which are key battery performance parameters. Capacity fade and power fade are highly dependent on the operating strategy since the underlying degradation mechanism are triggered in dependence of e.g. temperature, mechanical stress, charge and discharge currents and state of charge. Because of the large number […]
Using neural ordinary differential equations for grey-box modelling of lithium-ion batteries
Lithium-ion batteries are used in complex fields of application, such as electromobility, more often. With the increasing usage of lithium-ion batteries, the demand for battery models is growing as well. However, the parameterization of the models is often time-demanding and requires expert knowledge. Grey-box modelling can simplify the modelling approach. It combines physical and data-driven […]
Effect of silicon fraction and polymer molecular structure on the electrochemical performance of high-capacity lithium-ion cells
Silicon – with its low operating potential and much higher theoretical capacity than graphite – is assumed to be the anode material of choice for next generation lithium-ion batteries. However, silicon undergoes huge volume changes during lithium intercalation, deteriorating the mechanical integrity of the electrode and resulting in a significant capacity loss during cell cycling. […]