Hello
I am a student learning lithium-ion batteries
When designing a lithium-ion battery, the anode electrode is designed to be larger than the cathode electrode
I understand that this is due to the prevention of Li-plating and the advantage of electrode stacking.
Here's a question.
1. When Li-ion moves from the anode electrode to the cathode electrode, the anode electrode is larger than the cathode electrode, but why does this not occur?
2.Coin cell design, Li-metal is larger than Anode(graphite or Si... etc.), but why doesn't Li-plating happen at this time?
I want to know.
Please reply.
1. Lithium plating is not possible at the cathode material, its potential is too positive. At positive potentials, the reduction of Li+ to Li metal can not take place. Lithium ions are inserted into the cathode instead.
2. Lithium plating might happen during lithiation of graphite or Si electrodes. However, lithium plating can also happen at the Li electrode of half cells when the other electrode is delithiated. This means that in half cells with anode materials, Li plating is possible at both electrodes. Li plating will happen for sure at the lithium metal. At the other electrode, Li plating does only occur for certain conditions, e.g. if the potential is low enough.
Hi Kim,
A larger anode provides more surface area for lithium ions to intercalate into, which helps to prevent lithium plating on the anode surface. Lithium plating can lead to safety problems such as thermal runaway.Lithium plating can occur when the anode becomes depleted of lithium ions. This can happen during fast charging or discharging, or if the battery is overheated. Lithium plating can create dendrites, which are needle-like structures that can pierce the separator and cause a short circuit. This can lead to thermal runaway, which is a serious safety hazard.
Kiran Donthula
Thank you for your reply But my question is 1. It was a question about why Li plating does not occur because the anode electrode is larger than the cathode electrode when Li ions move from anode to cathode 2. It was a question about why this didn't happen in half cell when Li Metal was used in the opposite direction
Lithium plating occurs when the electrochemical potential of the anode is equal to or lower than the potential of metallic lithium. This means that the lithium ions that arrive at the anode cannot distinguish the anode material from metallic lithium and deposit in the metallic form instead of the desired intercalation into the anode.
When the anode electrode is larger than the cathode electrode, there is more space for lithium ions to intercalate into the anode. This helps to prevent the anode potential from dropping below the potential of metallic lithium, which reduces the risk of lithium plating.
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering
- Electrodes