Lithium Ion Batteries

Lithium ion batteries
1. Introduction
Chemical cells are important for our daily lives. There are many different types of cells designed for different uses. Lithium ion batteries are one of the common batteries and they are a secondary cell.

2.1 Chemical principle
In lithium ion batteries, both the positive electrode and negative electrode contain lithium compounds. When the cell is discharging, the lithium ions move from the negative electrode to the positive electrode. When the cell is charging, lithium ions move from the positive electrode to the negative electrode. The negative electrode of a conventional lithium ion battery is made from lithium-carbon compound LixC6. The positive electrode is a metal oxide (e.g. cobalt dioxide CoO2,
2.2 Chemical equations
Positive electrode: