2 research outputs found
State of Charge-Dependent Impedance Spectroscopy as a Helpful Tool to Identify Reasons for Fast Capacity Fading in All-Solid-State Batteries
Thiophosphate-based all-solid-state batteries (ASSBs)
are considered
the most promising candidate for the next generation of energy storage
systems. However, thiophosphate-based ASSBs suffer from fast capacity
fading with nickel-rich cathode materials. In many reports, this capacity
fading is attributed to an increase of the charge transfer resistance
of the composite cathode caused by interface degradation and/or chemo-mechanical
failure. The change in the charge transfer resistance is typically
determined using impedance spectroscopy after charging the cells.
In this work, we demonstrate that large differences in the long-term
cycling performance also arise in cells, which exhibit a comparable
charge transfer resistance at the cathode side. Our results confirm
that the charge transfer resistance of the cathode is not necessarily
responsible for capacity fading. Other processes, such as resistive
processes on the anode side, can also play a major role. Since these
processes usually depend on the state of charge, they may not appear
in the impedance spectra of fully charged cells; i.e., analyzing the
impedance spectra of charged cells alone is insufficient for the identification
of major resistive processes. Thus, we recommend measuring the impedance
at different potentials to get a complete understanding of the reasons
for capacity fading in ASSBs
Imaging of Lipids in Native Human Bone Sections Using TOF–Secondary Ion Mass Spectrometry, Atmospheric Pressure Scanning Microprobe Matrix-Assisted Laser Desorption/Ionization Orbitrap Mass Spectrometry, and Orbitrap–Secondary Ion Mass Spectrometry
A method
is described for high-resolution label-free
molecular imaging of human bone tissue. To preserve the lipid content
and the heterogeneous structure of osseous tissue, 4 μm thick
human bone sections were prepared via cryoembedding and tape-assisted
cryosectioning, circumventing the application of organic solvents
and a decalcification step. A protocol for comparative mass spectrometry
imaging (MSI) on the same section was established
for initial analysis with time-of-flight secondary ion mass spectrometry
(TOF-SIMS) at a lateral resolution of 10 μm to <500 nm, followed
by atmospheric pressure scanning microprobe matrix-assisted laser
desorption/ionization (AP-SMALDI) Orbitrap MSI at a lateral resolution
of 10 μm. This procedure ultimately enabled MSI of lipids, providing
the lateral localization of major lipid classes such as glycero-,
glycerophospho-, and sphingolipids. Additionally, the applicability
of the recently emerged Orbitrap–TOF-SIMS hybrid system was
exemplarily examined and compared to the before-mentioned MSI methods