Li-ion Battery:

Lithium ion (Li-ion) battery with the features of high energy density, high capacity, light weight and high power. The voltage of cylindrical type is 3.7V and button type is 3.6V. Li-ion batteries are one of the most popular types of rechargeable battery for portable electronics, as its best energy densities, no memory effect, and with a slow loss of charge when not in use.

Principle and Reactions:

When a lithium-based cell is charging, the lithium is extracted from the anode and inserted into the cathode. When the cell is discharging, the reverse occurs.

Positive reaction   LiCoO₂→ Li1-xCoO₂ + xLi+ + xe-

Negative reaction   xLi+ + xe- + 6C → LixC₆

Total reaction   LiCoO₂ + 6C → Li1-xCoO₂ + LixC₆