Li-Ion vs. Li-Po Batteries: Key Differences Explained

This article breaks down the differences between Lithium Ion (Li-Ion) and Lithium Polymer (Li-Po) batteries, two popular rechargeable battery types.

Lithium Ion Battery

Lithium Ion batteries are commonly found in many of our everyday electronics. Here’s a look at their key features:

• They are a popular type of rechargeable battery used in consumer electronics.
• Lithium ions move from the negative electrode to the positive electrode during discharge, and the reverse happens during charging.
• The battery utilizes an intercalated lithium compound as a primary electrode material.
• A typical Li-Ion battery cell consists of an electrolyte and two electrodes. The electrolyte facilitates the movement of ions.
• They boast benefits like high energy density, low self-discharge, and a minimal memory effect.

Lithium Polymer Battery

Lithium Polymer batteries are another type of rechargeable battery that leverages lithium-ion technology. Here’s what makes them unique:

• Like Li-Ion, Li-Po batteries are also rechargeable and use lithium-ion technology.
• The key difference is the use of a polymer electrolyte instead of the liquid electrolyte found in Li-Ion batteries. Semi-solid polymers with high conductivity are used as the electrolyte in Li-Po batteries.
• Li-Po batteries generally offer higher specific energy compared to other lithium battery types.
• These batteries are frequently used in devices where low weight is crucial, such as smartphones, thin laptops, and various electronic gadgets.

Both Li-Ion and Li-Po batteries are secondary (rechargeable) batteries, typically with voltage ratings of 3.6V and 7.2V. Both types also generally support a recharge life of about 300 to 400 cycles.

Lithium Ion vs. Lithium Polymer: A Detailed Comparison

The following table highlights the key differences between Lithium Ion and Lithium Polymer batteries: