Open Access

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2018-08-16
08:39
OpenAccess [FZJ-2018-04940] Journal Article
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Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges
Abstract: In order to meet the sophisticated demands for large-scale applications such as electro-mobility, next generation energy storage technologies require advanced electrode active materials with enhanced gravimetric and volumetric capacities to achieve increased gravimetric energy and volumetric energy densities. However, most of these materials suffer from high 1st cycle active lithium losses, e.g., caused by solid electrolyte interphase (SEI) formation, which in turn hinder their broad commercial use so far. [...]
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2018-08-15
10:39
OpenAccess [FZJ-2018-04894] Journal Article
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The plasticity of primary microglia and their multifaceted effects on endogenous neural stem cells in vitro and in vivo
BackgroundMicroglia—the resident immune cells of the brain—are activated after brain lesions, e.g., cerebral ischemia, and polarize towards a classic “M1” pro-inflammatory or an alternative “M2” anti-inflammatory phenotype following characteristic temporo-spatial patterns, contributing either to secondary tissue damage or to regenerative responses. They closely interact with endogenous neural stem cells (NSCs) residing in distinct niches of the adult brain. [...]
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2018-08-15
09:05
OpenAccess [FZJ-2018-04873] Journal Article
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Exploring the Effect of Increased Energy Density on the Environmental Impacts of Traction Batteries: A Comparison of Energy Optimized Lithium-Ion and Lithium-Sulfur Batteries for Mobility Applications
Energies 11(1), 150 - () [10.3390/en11010150]
The quest towards increasing the energy density of traction battery technologies has led to the emergence and diversification of battery materials. The lithium sulfur battery (LSB) is in this regard a promising material for batteries due to its specific energy. [...]
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2018-08-15
08:46
OpenAccess [FZJ-2018-04871] Journal Article
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Thermal analysis of LiNi0.4Co0.2Mn0.4O2/mesocarbon microbeads cells and electrodes: State-of-charge and state-of-health influences on reaction kinetics
The thermal stability of lithium ion batteries was studied by means of Accelerating Rate Calorimetry in Heat-Wait-Search operation on both electrode and cell level. Fresh and aged samples were investigated depending on the state-of-charge (SoC) of a 5 Ah pouch cell comprising mesocarbon microbeads and LiNi0.4Co0.2Mn0.4O2 as the anode and cathode materials. [...]
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2018-08-14
14:57
OpenAccess [FZJ-2018-04839] Journal Article
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Fast screening method to characterize lithium ion battery electrolytes by means of solid phase microextraction – gas chromatography – mass spectrometry
RSC Advances 7(74), 46989 - 46998 () [10.1039/C7RA08599K]  GO
Several electrolytes of commercially available lithium ion batteries (LIBs) were analyzed by solid phase microextraction – gas chromatography – mass spectrometry (SPME-GC-MS). The uptake and subsequent injection of the conducting salt LiPF6 into the GC system was prevented by using a headspace SPME setup. [...]
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2018-08-14
14:33
OpenAccess [FZJ-2018-04830] Journal Article
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Quantification of ionic organo(fluoro)phosphates in decomposed lithium battery electrolytes
RSC Advances 7(62), 39314 - 39324 () [10.1039/C7RA07486G]  GO
A method for the separation, identification and quantification of the ionic decomposition products of LiPF6 based organic electrolytes was developed. It employed the simultaneous coupling of two-dimensional ion chromatography (2D IC) with electrospray-ionization mass spectrometry (ESI-MS) and with inductively coupled plasma-mass spectrometry (ICP-MS). [...]
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2018-08-14
12:35
OpenAccess [FZJ-2018-04820] Journal Article
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Lithium-Metal Foil Surface Modification: An Effective Method to Improve the Cycling Performance of Lithium-Metal Batteries
Lithium metal as an electrode material possesses a native surface film, which leads to a rough surface and this has a negative impact on the cycling behavior. A simple, fast, and reproducible technique is shown, which makes it possible to flatten and thin the native surface film of the lithium‐metal anode. [...]
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2018-08-14
12:08
OpenAccess [FZJ-2018-04811] Journal Article
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The Role of Sub- and Supercritical CO2 as “Processing Solvent” for the Recycling and Sample Preparation of Lithium Ion Battery Electrolytes
Molecules 22(3), 403 - () [10.3390/molecules22030403]
Quantitative electrolyte extraction from lithium ion batteries (LIB) is of great interest for recycling processes. Following the generally valid EU legal guidelines for the recycling of batteries, 50 wt % of a LIB cell has to be recovered, which cannot be achieved without the electrolyte; hence, the electrolyte represents a target component for the recycling of LIBs. [...]
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2018-08-14
12:01
OpenAccess [FZJ-2018-04808] Journal Article
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Investigating the lithium ion battery electrolyte additive tris (2,2,2-trifluoroethyl) phosphite by gas chromatography with a flame ionization detector (GC-FID)
RSC Advances 7(84), 53048 - 53055 () [10.1039/C7RA09476K]  GO
The quantification of lithium ion battery electrolyte additives provides challenges in terms of methods and instrumentation. In this work, the detectability of the flame retardant additive tris(2,2,2-trifluoroethyl) phosphite (TTFPi) differs unusually when added to a standard electrolyte (1 M LiPF6 in ethylene carbonate (EC)[thin space (1/6-em)]:[thin space (1/6-em)]dimethyl carbonate (DMC) 1[thin space (1/6-em)]:[thin space (1/6-em)]1 wt%) using gas chromatography with a flame ionization detector (GC-FID). [...]
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2018-08-13
18:50
OpenAccess [FZJ-2018-04798] Journal Article
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Spin-coated planar Sb$_{2}$S$_{3}$ hybrid solar cells approaching 5% efficiency
Antimony sulfide solar cells have demonstrated an efficiency exceeding 7% when assembled in an extremely thin absorber configuration deposited via chemical bath deposition. More recently, less complex, planar geometries were obtained from simple spin-coating approaches, but the device efficiency still lags behind. [...]
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