What is the anode reaction for graphite in lithium-ion batteries?
C + xLi^+ + e^- → C_yLi_x
This reaction describes the intercalation of lithium ions into the graphite structure during charging.
List the advantages of using graphite as an anode material for lithium-ion batteries.
- Cheap
- High abundance
- Electrically conductive
- Thermally conductive
- Chemically passive (corrosion-resistant)
These properties make graphite a suitable choice for battery applications.
What is the capacity of graphite as an anode material in lithium-ion batteries?
- Theoretical: 372 mAh/g
- Practical: 310-330 mAh/g
The practical capacity is lower due to limitations in lithium-ion accommodation.
What is the density of graphite used in lithium-ion batteries?
~ 2 g/cm³
This low density contributes to its low volumetric capacity.
What is the purpose of the solid electrolyte interphase (SEI) in lithium-ion batteries?
- Ionic conducting
- Electronic insulating
The SEI allows lithium ion transport while blocking electrons to prevent further electrolyte decomposition.
True or false: The SEI is formed from the decomposition products of electrolytes.
TRUE
The SEI is crucial for ensuring continued electrochemical reactions in the battery.
What does an ideal SEI allow for in lithium-ion batteries?
- Lithium ion transport
- Blocks electrons
This functionality is essential for maintaining battery performance and longevity.
