TY  - JOUR
A1  - Windmüller, Anna
A1  - Schaps, Kristian
A1  - Zantis, Frederik
A1  - Domgans, Anna
A1  - Taklu, Bereket Woldegbreal
A1  - Yang, Tingting
A1  - Tsai, Chih-Long
A1  - Schierholz, Roland
A1  - Yu, Shicheng
A1  - Kungl, Hans
A1  - Tempel, Hermann
A1  - Dunin-Borkowski, Rafal E.
A1  - Hüning, Felix
A1  - Hwang, Bing Joe
A1  - Eichel, Rüdiger-A.
T1  - Electrochemical activation of LiGaO2: implications for ga-doped garnet solid electrolytes in li-metal batteries
JF  - ACS Applied Materials & Interfaces
N2  - Ga-doped Li7La3Zr2O12 garnet solid electrolytes exhibit the highest Li-ion conductivities among the oxide-type garnet-structured solid electrolytes, but instabilities toward Li metal hamper their practical application. The instabilities have been assigned to direct chemical reactions between LiGaO2 coexisting phases and Li metal by several groups previously. Yet, the understanding of the role of LiGaO2 in the electrochemical cell and its electrochemical properties is still lacking. Here, we are investigating the electrochemical properties of LiGaO2 through electrochemical tests in galvanostatic cells versus Li metal and complementary ex situ studies via confocal Raman microscopy, quantitative phase analysis based on powder X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and electron energy loss spectroscopy. The results demonstrate considerable and surprising electrochemical activity, with high reversibility. A three-stage reaction mechanism is derived, including reversible electrochemical reactions that lead to the formation of highly electronically conducting products. The results have considerable implications for the use of Ga-doped Li7La3Zr2O12 electrolytes in all-solid-state Li-metal battery applications and raise the need for advanced materials engineering to realize Ga-doped Li7La3Zr2O12for practical use.
KW  - LiGaO2
KW  - garnet solid electrolyte
KW  - ga-doping
KW  - Li7La3Zr2O12
KW  - solid-state battery
Y1  - 2024
U6  - https://doi.org/10.1021/acsami.4c03729
SN  - 39181–3919
VL  - 16
IS  - 30
PB  - ACS Publications
CY  - Washington, DC
ER  - 
TY  - JOUR
A1  - Eichler, Fabian
A1  - Balc, Nicolae
A1  - Bremen, Sebastian
A1  - Nink, Philipp
T1  - Investigation of laser powder bed fusion parameters with respect to their influence on the thermal conductivity of 316L samples
JF  - Journal of Manufacturing and Materials Processing
N2  - The thermal conductivity of components manufactured using Laser Powder Bed Fusion (LPBF), also called Selective Laser Melting (SLM), plays an important role in their processing. Not only does a reduced thermal conductivity cause residual stresses during the process, but it also makes subsequent processes such as the welding of LPBF components more difficult. This article uses 316L stainless steel samples to investigate whether and to what extent the thermal conductivity of specimens can be influenced by different LPBF parameters. To this end, samples are set up using different parameters, orientations, and powder conditions and measured by a heat flow meter using stationary analysis. The heat flow meter set-up used in this study achieves good reproducibility and high measurement accuracy, so that comparative measurements between the various LPBF influencing factors to be tested are possible. In summary, the series of measurements show that the residual porosity of the components has the greatest influence on conductivity. The degradation of the powder due to increased recycling also appears to be detectable. The build-up direction shows no detectable effect in the measurement series.
KW  - Additive manufacturing
KW  - LPBF
KW  - SLM
KW  - Thermal conductivity
KW  - 316L
Y1  - 2024
U6  - https://doi.org/10.3390/jmmp8040166
SN  - 2504-4494
N1  - Corresponding author: Fabian Eichler
VL  - 8
IS  - 4
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Baumann, Marcus
A1  - Tillmann, Urban
A1  - Aletsee, Ludwig
T1  - Distribution of Carbon Among Photosynthetic End Products in the Bloom-Forming Arctic Diatom Thalassiosira antarctica COMBER / Tillmann, U. ; Baumann, M.E.M. ; Aletsee, L.
JF  - Polar Biology. 10 (1989), H. 3
Y1  - 1989
SN  - 0722-4060
SP  - 231
EP  - 238
ER  -