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Lithium-ion batteries constitute

Author: Source: Datetime: 2016-10-18 15:21:43

In today's world, lithium-ion batteries are widely used in our lives, its applications include mobile phones, tablet PCs, laptops, smart watches, mobile power (charging Po), electric bicycles, electric cars, electric buses, unmanned aerial vehicles, solar powered portable generator and other types of power tools.

 

As the power source of many electronic devices, it can be said that left the lithium-ion battery, the world will not dare to imagine today. So, what is the lithium-ion battery in the end?


 Tablet


When it comes to the composition of lithium-ion batteries, we all know that lithium is an essential component, yes, that is our chemistry textbook periodic table that the lithium element. But a complete lithium-ion battery is not only only lithium, the following we come to talk with you about lithium-ion battery constitute those things.

 

Lithium-ion battery internal need to include several basic materials: cathode active material, negative active material, isolation film, electrolyte. So what are the materials function?

 

Positive and negative is not difficult to understand, to achieve the charge movement, the potential difference between the need to exist positive and negative materials, then what is the active material?

 

We know that the battery is actually the electrical energy and chemical energy conversion, in order to achieve the energy storage and release. To achieve this process, you need to be very positive and negative materials are very "easy" to participate in chemical reactions, to be lively, it is easy to oxidation and reduction, in order to achieve energy conversion, so we need "active material" to do the positive and negative batteries, such as LiFePO4 batteries.

 

What is electrolyte doing? Popularly speaking, is the swimming pool inside the "water", so that lithium-ion free to swim, so, ion conductivity (swimming resistance is small), electronic conductivity is small (insulation), chemical stability better (stability overrides all), thermal stability is better (both for safety), the potential window to be wide.

 

Based on these principles, after a long period of engineering exploration, people found by the high purity organic solvents, electrolyte lithium salt, and the necessary additives and other raw materials, under certain conditions, according to a certain percentage of the electrolyte prepared. Organic solvents include PC (propylene carbonate), EC (ethylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate) and other materials. Electrolyte lithium salts are LiPF6, LiBF4 and other materials.

 

Isolation membrane is to prevent direct contact with the positive and negative materials added, we want to make the battery as small as possible, the storage of energy as much as possible, so the distance between the positive and negative become smaller and smaller, short circuit become a huge risk.

 

In order to prevent the positive and negative materials short circuit, resulting in the intense release of energy, you need to use a material will be positive and negative "isolation", which is the origin of the isolation film. Isolation film need to have good ion through, mainly to the lithium-ion open channel, so that it can freely through, while the electronic insulator to achieve positive and negative insulation between. Currently on the market are mainly single-layer PP, single PE, double PP / PE, three PP / PE / PP composite film.

 

In addition to the above-mentioned four main materials, in order to lithium-ion battery from the laboratory of a "test product" into a commercial application of the product, such as use in solar power generator, but also need some other essential materials.

 

We first look at the positive electrode of the battery, in addition to active substances, there are conductive agents and adhesives, and as the current carrier of the substrate and current collector (the anode is usually aluminum foil). The binder should be as active material of lithium metal oxide uniform "fixed" in the positive baseband, the conductive agent will have to enhance the active substance and the substrate conductivity, in order to achieve greater charge and discharge current, the collector is responsible for the role of the battery Internal and external charge transfer bridges. 

 

In addition to the above materials, a complete lithium-ion battery also includes insulation, cover, pressure relief valve, shell (aluminum, steel, composite film, etc.), and other auxiliary materials.

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