Mobile power supply three types of electric core

With the popularity of a variety of smartphones, tablets, more and more people find that a variety of digital products, especially the mobile phone itself has been unable to meet the needs of life in the day-to-day use of the time, and the emergence of mobile power can be said to a certain extent to solve the problem. So for those who have not touched the mobile power of consumers, the dazzling range of mobile power how to choose?

Good power, the key is to see the batteries. Mobile power inside the core is like the car's fuel tank and transmission system, responsible for the entire mobile power supply a steady stream of power, directly determine the power of the good and bad. The circuit board of the mobile power supply can be regarded as the control system, which is mainly used for the distribution and conversion of power, and converts the 3.7V (or higher) voltage supplied by the lithium core to the standard 5V (or higher) voltage to provide power for the charged equipment.

The current mobile power supply batteries are commonly used lithium-ion battery, but the performance is different, and from the shape is completely invisible, the general specifications can not be reflected. The next step from the battery to start, step-by-step to explore the mysterious world of mobile power.

Lithium-ion batteries can be divided into liquid lithium-ion batteries (LIB) and polymer lithium-ion batteries (LIP) according to the different electrolyte materials used. Both the positive and negative materials used are the same, the cathode materials including lithium cobalt, nickel and cobalt manganese and lithium iron phosphate materials three kinds of negative graphite, the operating principle of the battery is basically consistent.

The main difference is the electrolyte, in which liquid lithium-ion batteries are liquid electrolytes, and polymer lithium-ion batteries are replaced with solid polymer electrolytes. The polymer can be "dry" or "colloidal", and most of the polymer colloid electrolytes are currently used.

Lithium Cobalt oxide (LiCoO2)

Lithium Cobalt oxide is commonly known as liquid lithium-ion batteries, the common form of 18650 and square shape. The 18650 battery is a cylindrical battery with a diameter of 18 mm and a height of 65 mm (it looks like an enlarged version of the 5th battery) and is widely used in notebook batteries. Now more than 60% of the mobile power supply in the market is also 18650 batteries because it is common with notebook batteries.

At present, the commercial lithium-ion batteries are basically the layered structure of lithium cobalt oxide as a positive material, the theoretical capacity of 274mah/g, the actual capacity of about 140mah/g, but also reported that the actual capacity has reached 155mah/g.

This cathode material has a higher working voltage (average working voltage of 3.7V), stable charging and discharging voltage, small volume, high energy ratio, good cycling performance, high conductivity, simple production process and easy manufacture.

Main advantages: Mature technology, wide range of applications, small size.

Main disadvantage: Cycle life of 300 times, safety can be low, resistance to overcharge, not suitable for high rate charge and discharge, after the waste of environmental pollution.

Ii. Nickel Cobalt Manganese (LINICOMNO2)

Nickel-Cobalt manganese, also known as ternary material (LiNiCoMnO2), is a kind of polymer lithium-ion battery, the common form is box soft package shape. Note that lithium cobalt can also be made into square shape, but after forming is hard, by hand pinch can be distinguished.

Ternary materials with the popularity of smartphones in the past two years has developed rapidly, the use of more and more fields. It is nickel salt, cobalt salt, manganese salt as raw material, the proportion of nickel cobalt manganese can be adjusted according to the actual needs.

The battery with three yuan material as cathode is more safe than lithium cobalt acid battery, and its service life is higher than that of cobalt acid lithium, and it has reached 500 cycle life.

Main advantages: The volume diversity, the use of a very wide range, not easy to explode, high safety factor.

Main disadvantage: High price, pollution of the environment after the waste, large current charging and discharging performance is weak.

Lithium ferric phosphate (LiFePO4)

The most important difference between lithium iron phosphate and the first two types of batteries is that the anode of the battery is added to the iron element. Lithium iron has only just started in recent years, is a very potential material, its safety and cycle life is not comparable to other materials, these are the most important technical indicators of power batteries. Charge and discharge cycle life of 2000 times, single battery over charging pressure 30V does not burn, puncture does not explode.

Lithium iron phosphate anode material made of large-capacity battery pack more easily in series to meet the needs of frequent battery charge and discharge, and has non-toxic, non-polluting, safe performance, a wide range of raw materials, cheap, long life and other advantages, is a new generation of lithium-ion battery ideal cathode material.

At present, ferroelectric electric buses to large capacity, signal base station storage and large-scale UPS applications, of which mobile power, AA batteries just began to test water large-scale production, which makes the ferroelectric gradually in the medium and large capacity ups, small storage batteries, lawn lamps, power tools are widely used.

Main advantages: 2000 Times Cycle service life, large current charge and discharge, small internal resistance, safety, non-toxic environmental protection.

Main disadvantage: The price is expensive, digital products have not been widely used in the field, consumers in the eyes of the low level of awareness.