When discharging a lithium-ion cell, which of the following are true? Select all that apply.
CS Electrical And Electronics Staff asked 4 years ago
Options
- Lithium diffuses from the center of a negative-electrode particle toward its surface
- Lithium diffuses from the center of a positive-electrode particle toward its surface
- Lithium at the surface of negative-electrode particles give up electrons and enter the electrolyte as Li++ cations
- Lithium at the surface of positive-electrode particles give up electrons and enter the electrolyte as Li++ cations
- Li++ cations diffuse through the electrolyte from high-concentration regions to low-concentration regions.
1 Answers
CS Electrical And Electronics Staff answered 4 years ago
The correct answers are:
- Lithium diffuses from the center of a negative-electrode particle toward its surface (Yes. As lithium exits the surface of the particle, it creates a local low-concentration region. Then, lithium diffuses from the high-concentration region in the center of the particle toward the surface.)
- Lithium at the surface of negative-electrode particles give up electrons and enter the electrolyte as Li++ cations (Yes. During discharge, the negative electrode gives up electrons to the external circuit and corresponding cations to the electrolyte.)
- Li++ cations diffuse through the electrolyte from high-concentration regions to low-concentration regions (Yes. In particular, Li^++ diffuses from the negative-electrode region toward the positive-electrode region.)