Pacific Automotive Network lithium iron phosphate battery separators can be divided into different types based on their structures and compositions. There are three important types that are common in the market, namely porous polymer membranes and non-woven separators. and inorganic separators.
What is the separator used for in the lithium battery? This separator prevents electrons from passing through. This way the electrons can only go to the external circuit, which will cause current in the external circuit. But this membrane lets lithium ions pass through.
The lithium battery separator can also prevent the positive and negative electrodes from contacting immediately. If the positive and negative electrodes come into contact immediately, a short circuit will occur and the battery may explode and catch fire. .
When using lithium batteries,be careful not to bend or puncture the battery, as this may break the separator.
If the lithium battery separator is broken, it is very dangerous.
Lithium battery is a type of battery with excellent performance. Such a battery has a high energy density and is quite light.
The batteries used in mobile phones, tablets and laptops are mainly lithium batteries.
There are two types of lithium batteries used in pure electric vehicles, one is lithium iron phosphate battery and the other is ternary lithium battery.
The energy density of ternary lithium batteries is higher than that of lithium iron phosphate batteries, but the safety factor of lithium iron phosphate batteries is better than that of ternary lithium batteries.
Ternary lithium batteries start to burnat 200 degrees Celsius, but lithium iron phosphate batteries don't start burning until 800 degrees Celsius.
Most pure electric vehicles primarily use ternary lithium batteries, because these batteries are lighter and have higher energy density.
(Images/Text/Photos: Pacific Automotive Network Q&A)
Here is the meaning of the diaphragm:< / p>
1. Basic explanation
The separator is a thin film used to separate the positive and negative poles during electrolysis reactions to avoid energy loss due to direct reactions in the electrolysis. cell. In the structure of lithium batteries, the separator is one of the key internal components. The performance of the separator determines the interface structure, internal resistance, etc. of the battery, which directly affects the capacity, cycle and performancebattery safety. Excellent separators play an important role in improving the overall performance of the battery.
2. Batteries are one of the most important applications of separators
It is mainly used to separate the positive and negative plates of the battery to avoid contact. between the two poles Creates a short circuit and lets the ions of the electrolyte pass through.
3. Let's take the example of the lithium-ion battery to illustrate the different properties of the separator
1 Good chemical stability, the electrolyte is organic. solvent system, the diaphragm material cannot chemically react or dissolve with it;
2. High tensile and puncture strength to meet winding assembly requirements.
3. Higher porosity to increase current density, uniform pore size distribution to avoidlocal overheating caused by unequal current density
4. Good electrolyte wettability, high liquid absorption rate; conducive to improving ionic conductivity;
5. It has a lower closing temperature and a higher membrane rupture temperature to ensure battery safety.
IV. Lithium Battery Separator Requirements
1. It has electronic isolation and provides mechanical isolation of the positive and negative electrodes.
2. It has a certain pore size and porosity to ensure low resistance and high ionic conductivity, and has good lithium ion permeability.
3. Since the electrolyte solvent is a highly polar organic compound, the separator must be resistant to electrolyte corrosion and have sufficient chemical and electrochemical stability.
4. It has good electrolyte wettabilitye and has sufficient capacity to absorb liquids and hydrate.
5. It has sufficient mechanical properties, including puncture resistance, tensile strength, etc., but the thickness is as small as possible.
6. Good spatial stability and flatness.
7. Good thermal stability and automatic shutdown protection performance. Power batteries have higher requirements for separators and composite membranes are generally used.