Also, you will have to report results in $J/kg$, so make sure you keep track of your units and convert if necessary. The anode is the negative or reducing electrode from where electrons are released to the external circuit and oxidize during an. The terms were coined in 1834 by William Whewell, who derived the words from the Greek word Kathodes which means ‘descent’ or ‘way down’. Keep in mind that not all electrodes will be porous (for example for Li metal you can assume porosity is 0%). Anode and cathode are defined by the flow of current. The SEI layer or solid electrolyte interphase layer is a component of lithium-ion batteries, formed from the decomposition materials associated with the. Remember, you are looking for the electrodes masses so that you can compute energy density (hint: start by looking into densities of your materials). You were given some electrode geometric parameters and you will have to find the others. The anode in a lithium-ion battery is a mixture of lithium and other metals. Why are you multiplying this equation with thickness and porosity? $E$ is energy density in Wh/kg, $V$ is nominal voltage in volts, $C$ is capacity in Ah and $m$ is mass in kg. This is the equation to find the energy density of a battery: $$E=VC/m$$ The question is asking you to make sure that the charge capacity ratio is equal to one, which means you will need to find what anode thickness you must have for the capacities match (they give you cathode thickness of 100 microns) These capacities can be made equal by tailoring the thickness of the electrodes. The formula I am using isĮnergy density = (potential difference between anode and cathode) * cathode charge (capacity)* electrode thickness (this was given in the PS)*(1-porosity(this was also given)) below is an image of what the given information and potential answers looks likeĬathode and anode will have different specific charge capacities. I have tried calculating this and the other problems a few different ways with different units but I am not getting the correct answer. When I calculate the value I don't get something close to the answer given in the solution which is 453.6 J/kg. I assumed no porosity contributions from other components such as binders. We are asked to assume an electrode thickness of 100 micrometers and a porosity of 35%. For the first problem, it asks this for a lithium metal anode, LiCoO2 cathode system. On one of the practice problems, it asks to calculate the energy density of a given battery system. Everyone, I'm using nanohub's introduction to the material science of rechargeable batteries course to do some self-studying until I can go back into the lab.
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