What are Lithium-Ion Batteries?
Lithium-ion batteries represent the dominant battery technology in modern mobile devices. These rechargeable batteries generate electrical current through the movement of lithium ions between the anode (negative electrode) and cathode (positive electrode). During discharge, lithium ions flow from the anode through an electrolyte to the cathode, generating electrical current. During charging, this process reverses as external electrical energy forces the ions back to the anode.
Advantages of Li-ion Technology
- High energy density - can store significant amounts of energy relative to their size and weight
- Minimal memory effect - can be charged at any point without significantly degrading capacity
- Low self-discharge rate - typically lose only 2-3% of their charge per month when not in use
Limitations and Considerations
- Sensitive to extreme temperatures - performance degrades in very hot or cold conditions
- Degrade over time regardless of use - experience capacity fade as they age
- Require protection circuitry to prevent overcharging, over-discharging, and short circuits