Lithium polymer battery, as a kind of battery with high energy density and light weight, is widely used in mobile equipment, electric vehicles and other fields. This article will introduce the basic knowledge of lithium polymer battery, including its structure, working principle, advantages and disadvantages, and application scenarios to help readers have a deeper understanding of this important battery technology.

1. Structure

the main structure of lithium polymer battery includes positive electrode, negative electrode, electrolyte and separator:

• positive electrode: it is usually composed of lithium cobalt oxide (LiCoO2), lithium nickel manganese oxide (NMC) and other materials, and is the positive electrode plate of the battery.
• Negative electrode: usually composed of graphite or graphene material, it is the negative electrode plate of the battery.
• Electrolyte: generally, polymer electrolyte, such as polyacrylonitrile (PAN) or polyethylene oxide (PEO), is used to conduct lithium ions.
• Diaphragm: used to isolate positive and negative poles to prevent short circuit, usually composed of polypropylene (PP) or polyethylene (PE).

2. Working principle

3. Advantages and disadvantages

lithium polymer battery has the following advantages:

• high energy density: Compared with traditional nickel-cadmium batteries and nickel-hydrogen batteries, lithium polymer batteries can provide higher energy density and make the equipment lighter.
• No memory effect: lithium polymer battery has no memory effect and can be charged at any time without affecting battery life.
• Long service life: lithium polymer battery has a long service life, many cycles and a long service life.

However, lithium polymer batteries also have some disadvantages, such:

• higher cost: higher production cost and relatively expensive price.
• Security issues: security risks may exist in the case of overcharging, overdischarging, or external short circuit.

4. Application scenarios

lithium polymer battery widely used in the following fields:

• mobile devices: such as smart phones, tablets, laptops, etc.
• Electric vehicles: such as electric vehicles, electric bicycles, etc.
• Energy storage: such as solar energy storage system, wind energy storage system, etc.