A Consensus Algorithm for Multi-Objective Battery Balancing
Batteries stacks are made of cells in certain series-parallel arrangements. Unfortunately, cell performance degrades over time in terms of capacity, internal resistance, or self-discharge rate. In addition, degradation rates are heterogeneous, leading to cell-to-cell variations. Balancing systems can be used to equalize those differences. Dissipative or non-dissipative systems, so-called passive or active balancing, can be […]
The Impact of Thermal Gradients on the Aging Behavior of Lithium-Ion Batteries
Temperature is a dominant parameter in lithium-ion batteries’ aging behavior. Aging mechanisms in lithium-ion batteries correspond to unwanted side reactions, often associated with film formation on the electrodes. This work shows measurement results illustrating the effect of thermal gradients on the aging behavior of a commercial nickel-rich pouch lithium-ion battery. Using a carefully designed test […]
Aging model development for degradation mechanisms of C6/LiFePO4 batteries
Driven by the ever-growing concerns toward safety issues in lithium-ion batteries (LIBs), the study devoting to battery aging has drawn significant attention. An in-depth understanding of aging mechanisms is essential for developing LIBs with enhanced operating stability and improved life-span. Solid-electrolyte-interphase (SEI) formation on the anode is considered one of the main factors that give […]
Aging model development for degradation mechanisms of C6/LiFePO4 batteries
Driven by the ever-growing concerns toward safety issues in lithium-ion batteries (LIBs), the study devoting to battery aging has drawn significant attention. An in-depth understanding of aging mechanisms is essential for developing LIBs with enhanced operating stability and improved life-span. Solid-electrolyte-interphase (SEI) formation on the anode is considered one of the main factors that give […]
Aging mechanisms of C6/NCM Li-ion batteries unraveled by non-destructive and postmortem methods
The growing demand for sustainable energy storage devices intensively requires rechargeable lithium-ion batteries (LIBs) with higher specific capacity and stricter safety standards.[1] The layered ternary transition metal oxide (NMC) electrode system outperforms others and attracted much attention in both academia and industry.[2] Despite many merits, the NCM electrode system suffers from potential safety hazards, posing […]
Measuring inhomogeneous pressure distribution in lithium-ion pouch cells during long-term ageing
Several studies have shown that applying the right amount of mechanical pressure on lithium-ion batteries can reduce their aging drastically. In research, this pressure is usually applied using stiff plates that apply either a nearly constant force by using springs or a constant strain with fixed rods. In contrast, the industry uses cushioning pads in […]
Low-cost “super” binder for silicon
The pursuit of advanced Li-ion battery chemistries for next generation performance is primarily limited by advancements in anode designs.There are two approaches being pursued in the markets to replace traditional carbon-based anodes 1) Li-metal anode which requires significant effort & components to manage its thermal performance – hence the solid-state electrolytes, and other technologies, and […]
Formation Optimisation via Float-Current Measurement for High-Nickel/Graphite-SiOx Cells
Electrolytes play a central role in cell development, as they significantly influence the behaviour and ageing of lithium-ion batteries. The identification of optimal electrolyte formulations can thus lead to decisive competitive advantages in cell production. Electrolyte decomposition is indicated by gas formation, drying of the cell and/or the formation of cover layers and reactive intermediates. […]
Battery Passport – a positive impact to the battery life-cycle CO2?
Due to the push of powertrain electrification for road transport decarbonisation purposes, an increase in demand for respective traction batteries is projected in the upcoming years. By today’s measures the battery contributes a large part to the CO2 emissions of the vehicle in the life-cycle. A consequent monitoring and reduction of these CO2 outputs are […]
Moderately Concentrated Acetonitrile-containing Electrolytes with High Ionic Conductivity for Durability-oriented Lithium-Ion Batteries
Until today, the use of acetonitrile (AN) based electrolytes in lithium-ion batteries could only be enabled by using superconcentrated electrolyte mixtures with a lithium salt concentration of over 2 mol L-1, due to the poor reductive stability of AN against graphite. [1] Here, the durability of electrolyte containing AN using low concentration of dual lithium […]