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Influence of pressure on electrochemical performance of Lithium ion batteries
During lithium ion battery operation, volume changes in the battery’s electrodes lead to significant internal pressure. We characterize how this pressure changes battery
structure and influences performance. For this purpose, we want to design an
electrochemical pressure cell for battery testing.
Keywords: Lithium Ion Batteries, Engineering, Electrochemistry
Lithium ion batteries (LIBs) consist of a positive (cathode) and a negative (anode)
electrode, with a separator in between. During discharging of the battery, the positively charged lithium ions move from the anode to the cathode while the corresponding negative charges drive the load that is connected to the battery. Upon charging, the opposite process takes place and lithium ions move from the cathode to the anode and get stored there.
This lithiation/delithation results in substantial volume changes of the battery’s electrodes (> 300% for silicon anodes) and, as a consequence, all battery components are exposed to significant pressure during battery operation. Our laboratory characterizes how this pressure changes the structure of battery components and influences battery performance.
Lithium ion batteries (LIBs) consist of a positive (cathode) and a negative (anode) electrode, with a separator in between. During discharging of the battery, the positively charged lithium ions move from the anode to the cathode while the corresponding negative charges drive the load that is connected to the battery. Upon charging, the opposite process takes place and lithium ions move from the cathode to the anode and get stored there. This lithiation/delithation results in substantial volume changes of the battery’s electrodes (> 300% for silicon anodes) and, as a consequence, all battery components are exposed to significant pressure during battery operation. Our laboratory characterizes how this pressure changes the structure of battery components and influences battery performance.
The goal of this project is to adapt and test an existing electrochemical pressure cell design that allows applying controlled pressure on battery components during
electrochemical operation. The final cell design will be used to investigate the influence of pressure on the transport performance of different separators and to investigate the formation of Lithium dendrites on different kinds of separators in a Lithium|Lithium setup under the application of pressure.
Your tasks:
• adapt an existing electrochemical test cell to the specific needs
• validate the cell design in electrochemical measurements with battery materials
• Investigate the influence of pressure on different types of separators and compare it with simulations
• Investigate the formation of Li dendrites
The goal of this project is to adapt and test an existing electrochemical pressure cell design that allows applying controlled pressure on battery components during electrochemical operation. The final cell design will be used to investigate the influence of pressure on the transport performance of different separators and to investigate the formation of Lithium dendrites on different kinds of separators in a Lithium|Lithium setup under the application of pressure.
Your tasks: • adapt an existing electrochemical test cell to the specific needs • validate the cell design in electrochemical measurements with battery materials • Investigate the influence of pressure on different types of separators and compare it with simulations • Investigate the formation of Li dendrites