scholarly journals Design and Validation of an Online Partial and Total Pressure Measurement System for Li-Ion Cells

2020 ◽  
Author(s):  
Robin Lundström ◽  
Erik Berg
Keyword(s):  
Total Pressure ◽  
Detection Sensitivity ◽  
Pressure Measurements ◽  
Electrochemical Systems ◽  
Degradation Reactions ◽  
Li Ion ◽  
Gas Reactions ◽  
Development And Validation ◽  
Technical Basis ◽  
Pressure Measurement System

Online Electrochemical Mass Spectrometry (OEMS) is capable of monitoring both partial and total gas pressure of Li-ion cells. Herein, the development and validation of an OEMS system along with detailed calibration protocols and limits of detection sensitivity are showcased. A full cell based on LiCoO<sub>2</sub>/Graphite cell during overcharge to 4.9 V <i>vs.</i> Li/Li<sup>+</sup> at 50 °C is investigated and the results are compared to LiCoO<sub>2</sub>/LiFePO<sub>4</sub> and Graphite/LiFePO<sub>4</sub> cells in order to differentiate between gases forming at the anode and cathode. The release of O<sub>2</sub> from Li<sub>x</sub>CoO<sub>2</sub> (x < 0.4) during both charge and discharge demonstrates that its degradation is dependent on composition rather than potential. Combining partial and total pressure measurements provides a clear advantage when detailing major and minor gas reactions as well as when determining unaccounted gases. The methodology presented herein provides a technical basis for deeper understanding of degradation reactions in batteries and electrochemical systems alike.

scholarly journals Design and Validation of an Online Partial and Total Pressure Measurement System for Li-Ion Cells

2020 ◽  
Author(s):  
Robin Lundström ◽  
Erik Berg
Keyword(s):  
Total Pressure ◽  
Detection Sensitivity ◽  
Pressure Measurements ◽  
Electrochemical Systems ◽  
Degradation Reactions ◽  
Li Ion ◽  
Gas Reactions ◽  
Development And Validation ◽  
Technical Basis ◽  
Pressure Measurement System

Online Electrochemical Mass Spectrometry (OEMS) is capable of monitoring both partial and total gas pressure of Li-ion cells. Herein, the development and validation of an OEMS system along with detailed calibration protocols and limits of detection sensitivity are showcased. A full cell based on LiCoO<sub>2</sub>/Graphite cell during overcharge to 4.9 V <i>vs.</i> Li/Li<sup>+</sup> at 50 °C is investigated and the results are compared to LiCoO<sub>2</sub>/LiFePO<sub>4</sub> and Graphite/LiFePO<sub>4</sub> cells in order to differentiate between gases forming at the anode and cathode. The release of O<sub>2</sub> from Li<sub>x</sub>CoO<sub>2</sub> (x < 0.4) during both charge and discharge demonstrates that its degradation is dependent on composition rather than potential. Combining partial and total pressure measurements provides a clear advantage when detailing major and minor gas reactions as well as when determining unaccounted gases. The methodology presented herein provides a technical basis for deeper understanding of degradation reactions in batteries and electrochemical systems alike.

Total Pressure Measurements for Chloroform + Acetone + Toluene at 303.15 K

1994 ◽  
Vol 39 (3) ◽  
pp. 488-492 ◽  
Author(s):  
Jay A. Hopkins ◽  
Venkat R. Bhethanabotla ◽  
Scott W. Campbell
Keyword(s):  
Total Pressure ◽  
Pressure Measurements

Thermisches Verhalten von festem LaAlCl6 und chemischer Transport von LaCl3 mit AlCl3/Thermical Behaviour of Solid LaAlCl6 and Chemical Transport of LaCl3 with AlCl3

1999 ◽  
Vol 54 (11) ◽  
pp. 1410-1416 ◽  
Author(s):  
H. Oppermann ◽  
H. Dao Quoc ◽  
A. Morgenstern
Keyword(s):  
Total Pressure ◽  
Chemical Transport ◽  
Lanthanum Chloride ◽  
Pressure Measurements ◽  
Melting Diagram

The thermodynamical data of solid aluminium lanthanum chloride LaAlCl6 have been obtained by determination of the decomposition equilibria from total pressure measurements. The melting diagram was determined by DTA. The chemical transport of LaCl3 with AlCl3 is suggesting the existence of the gaseous complex LaAl3Cl12. The data are:ΔH(LaAlCl6f,298) =-427,1 ±2,5 kcal/mol, S°(LaAlCl6,f,298) = 61 ±2,5 cal/K-mol,Δ(LaAl3Cl12,g ,298) =-712 ± 7 kcal/mol, S°(LaAl3Cl12,g,298) = 205 ± 3 cal/K-mol.

Thermochemische Untersuchungen zu den Systemen SE2O3-SeO2. V. Ytterbiumselenoxide auf dem Schnitt Yb2O3-SeO2/Thermochemical Investigations of Systems RE2O3-SeO2. V. Ytterbium Selenium Oxides on the Line Yb2O3-SeO2

2002 ◽  
Vol 57 (8) ◽  
pp. 868-876 ◽  
Author(s):  
H. Oppermann ◽  
M. Zhang-Preße ◽  
P. Schmidt
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Solid State ◽  
Ir Spectroscopy ◽  
Powder Diffraction ◽  
Solid State Reaction ◽  
Total Pressure ◽  
Pressure Measurements ◽  
Thermodynamical Equilibrium ◽  
X Ray

The pure ternary phases on the line Yb2O3-SeO2 in thermodynamical equilibrium have been synthesized by solid state reaction and characterized using X-ray powder diffraction and IR-spectroscopy. There exist three phases: Yb2SeO5, Yb2Se3O9 and Yb2Se4O11, the last one with a homogeneiety range extending a higher SeO2-content. The thermal decompositions have been determined by total pressure measurements, and the thermodynamical data of the compounds have been derived. The phase diagram and the phase barogram have been established using the results of thermal analysis and total pressure measurements.

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