From：CTECHI GROUP Limited Release time：2019-02-27
Overview：Knowing something starts from the better or the worse. There is no difference between good and bad, the author starts with the basic indicators to teach you how to distinguish some important concepts about mobile power supply. High and low, have their own reasons for high and low. The primary factor in evaluating the quality of mobile power supply is the classification of lithium batteries it uses.
Knowing something starts from the better or the worse. There is no difference between good and bad, the author starts with the basic indicators to teach you how to distinguish some important concepts about mobile power supply.
High and low, have their own reasons for high and low. The primary factor in evaluating the quality of mobile power supply is the classification of lithium batteries it uses.
Why is this classification important? Because lithium battery itself is a comprehensive and large concept, lithium batteries, lithium ion batteries, lithium ion polymer batteries, more than a few words in which there are articles, the cost difference is also very different.
Lithium-ion batteries are generally referred to as lithium-ion batteries, but strictly speaking, they are quite different from lithium-ion batteries. Lithium batteries are lithium primary batteries, which use lithium metal or lithium alloy as anode material and contain pure lithium metal. They are disposable batteries using non-aqueous electrolyte solution.
Lithium-ion batteries are disposable batteries. Does lithium-ion batteries mean rechargeable lithium batteries? Neither. Generalized rechargeable lithium batteries are composed of a graphite negative electrode, a positive electrode using cobalt, manganese or iron phosphate, and an electrolyte used to transport lithium ions. But there are also disposable lithium-ion batteries, which use lithium metal or lithium-intercalated materials as negative electrodes.
Compared with lithium-ion batteries, the extra word "ion" emphasizes the delivery of "lithium ion" electrolyte. We are familiar with 18650 batteries, which contain adsorbed liquid electrolyte, so all 18650 batteries belong to lithium-ion batteries. The reason why 18650 batteries are proposed separately from lithium-ion batteries is the need of Sony's industrial standard production. The lithium-ion rechargeable and dischargeable batteries with a diameter of 18 mm and a length of 65.0 mm are made, which are more widely used and more common. So, in addition to the 18650 standard, there are 16340 batteries.
As for lithium-ion polymer batteries, the extra word "polymer" emphasizes that the electrolyte is colloidal, solid or semi-solid lithium-ion batteries. The reason why lithium-ion polymer batteries are so tall is that "solid polymer" replaces the traditional liquid electrolyte.
The advantages of using colloidal or solid polymer instead of liquid organic solvent electrolyte are that the polymer can be made into arbitrary shape to adapt to different equipment, with high adaptability, and the degree of freedom of industrial design of equipment can be guaranteed. For example, mobile phones (18650 batteries with fixed shapes and liquid electrolytes are obviously not available on today's smartphones). Secondly, the electrolyte in the polymer state has higher security: the liquid electrolyte will explode under the extreme conditions of short circuit and high temperature and high pressure, while the polymer will only expand and bulge out, and in the extreme state, explosive combustion will not occur.
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