A5069978566- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Extraction and Separation Processes
- Inorganic Fluorides and Related Compounds
- Inorganic Chemistry and Materials
Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg
2022-2024
Karlsruhe Institute of Technology
2022
Helmholtz-Institute Ulm
2019
We present an extensive analysis of Li-ion battery ageing via Arrhenius plots. The V-shaped plots show minima at optimum temperature corresponding to the longest cycle-life. V-shape signifies crossover between two dominating mechanisms – solid electrolyte interphase (SEI) growth in high range and lithium deposition low range. Subjects our investigations are commercial 5 Ah energy 21,700-type cells with LiNi0.90Co0.05Al0.05O2 + LiNiO2 (NCA LNO) cathode Si/graphite anode (∼3% Si) 0.1 lab-made...
Operation temperature is known to be one of the most impacting parameters for aging Li-ion batteries under cycling conditions. While Li plating usually dominates at low temperatures, Solid-Electrolyte-Interphase (SEI) growth often elevated temperatures. The longest cycle life observed crossover both mechanisms around 25 °C. We introduce color maps show changes in rate during battery aging. Reconstructed 3-electrode full cells with reference electrode that prolonged CV phase charging...
The development of high energy density and sustainable all-solid-state lithium batteries relies on the suitable Li+ transporting solid electrolytes with chemical electrochemical stability, good interfacial compatibility, ionic conductivity. Ceramic-based show bulk conductivity stability but exhibit poor mechanical properties. In contrast, a few sulfide-based total better properties stability. Moreover, both types compatibility issues several electrode materials. Here, we reveal potential...
The safety of Li-ion batteries is the most critical many important characteristics and must be carefully considered. However, depending on aging conditions, can change drastically. We had recently introduced ARC-MS as a new tool for investigations, which an updated accelerating rate calorimeter (ARC) combined with mass spectrometer (MS). Additionally, our setup equipped by seven more low cost sensors (temperature, voltage, resistance, audio, strain, transmitted reflected ultrasound). In this...
Lithium deposition on anode surfaces can lead to fast capacity degradation and decreased safety properties of Li-ion cells. To avoid the critical aging mechanism lithium deposition, its detection is essential. We present workflows for efficient Li electrode cell level. The are based a variety complementary advanced physico-chemical methods which were validated against each other both graphite graphite/Si electrodes: Electrochemical analysis, scanning electron microscopy, glow...
Extending the lifetime of lithium-ion batteries is essential to maximize resource efficiency and minimize environmental impact. Therefore, understanding aging mechanisms that undergo in their first life critical ensure safe operation second-life applications. This study focuses on a comprehensive safety assessment commercial 18650-type with graphite||NCA chemistry. The aged cells mechanism lithium plating was tested using thermal (ARC), electrical (overcurrent, overcharge, overdischarge),...
It is known that both the material used in Li-ion battery cells, as well their aging history and state of charge (SOC), strongly impact safety such cells. This study investigates characteristics new or aged 21700 cells containing silicon-graphite blend anodes together with Ni-rich NMC cathodes by accelerating rate calorimetry (ARC) at different SOC. Cells underwent cyclic 0 °C, room temperature, 50 °C to induce mechanisms including Li plating solid electrolyte interphase growth. The...
This study presents a novel method for implementing internal temperature sensors in cylindrical lithium-ion batteries by laser ablation to enhance the understanding of thermal runaway (TR) behavior. Using commercial 21700 cells, Accelerating Rate Calorimetry (ARC) experiments were conducted at various states charge. The results showed that changes during safety-critical events, such as venting and TR, significantly higher compared externally measured cell surface temperatures.
A constant and homogenous temperature control of Li-ion batteries is essential for a good performance, safe operation, low aging rate. Especially when operating battery with high loads in dense systems, cooling system required to keep the cell controlled range. Therefore, an existing module set up water-based liquid aluminum plates. finite-element simulation used optimize design arrangement plates regarding power consumption, efficiency, homogeneity. The heat generation described by lumped...
Competing effects of graphite and Si result in a complex temperature dependent performance degradation Li-ion batteries with Si-graphite composite anodes. This study examines the influence varying content (0 to 20.8 wt%) anodes consistent areal capacity N/P ratio full cells containing NMC622 cathodes. One hundred pilot-scale double-layer pouch were built cycle aged range from −10 55 °C. Electrochemical characterization demonstrated that increasing contents enhance mitigate internal...
Li-ion battery safety behavior is critical and should be examined carefully. However, testing typically performed only on pristine cells. This neglects the significant effect of aging conditions, such as ambient temperature, behavior. For example, at low temperatures results in Li plating thus drastically reduces [1–3]. Cells aged higher with a pronounced solid-electrolyte-interface (SEI) layer anode show an increased onset self-heating leading to improved [3,4]. The temperature dependent...
Compared to many other characteristics of Li-ion batteries, the safety behavior is a critical property and should be examined carefully. Especially manufacturers most studies only focus on pristine cells. However, can drastically change dependent prior aging conditions such as ambient temperature. low temperature aged cells with Li plating show decreased [1]. Moreover, at higher temperatures distinct solid-electrolyte-interface (SEI) layer anode an increased onset self-heating leading...
The cycle life of Li-ion batteries is limited by aging on the material and electrode level. Prolonging battery helps increasing sustainability, reducing dependency from critical raw materials, safes costs. first step in extending to understand underlying degradation mechanisms. Post-Mortem analysis commercial pilot-line made cells showed that Lithium plating a very relevant severe mechanism which can lead high rates decrease safety properties. 1 In this talk, we analyse cell On level,...
The ageing rate and consequentially service life of mass-produced lithium-ion batteries depends on many external internal factors. Some the more important ones are charge-discharge rate, ambient temperature, electrode thickness state health (SoH). This makes estimation lifetime battery cells very challenging time-consuming. motivates development models capable determining behavior a cell with relatively little experimental data. In this study 1 we build our previous work 2,3 use Arrhenius...