Power Bank selection? Analysis of three types of batteries

　　Good power bank, the key depends on batteries. Power Bank inside the battery is like a car's fuel tank and transmission system, responsible for the entire mobile power to provide a steady stream of power, directly determines the mobile power good or bad. Mobile power circuit board can be seen as a control system, mainly responsible for the power distribution and conversion, the lithium batteries provide 3.7V (or higher) voltage is converted to standard 5V (or higher) voltage, to To provide power to the device being charged.

　　The current mobile power batteries generally use lithium-ion batteries, but the performance varies, but also from the shape is completely out of sight, the general specifications can not be reflected. The following from the battery to start, step by step to explore the mysterious world of mobile power.

　　First, lithium cobalt oxide (LiCoO2)

　　Lithium cobalt oxide is commonly known as liquid lithium-ion battery, a common form of 18650 and the shape of the box. 18650 battery is a diameter of 18 mm, 65 mm high cylindrical battery (looks like the 5th battery of the enlarged version), widely used in laptop batteries. As with the laptop battery, now on the market more than Liucheng mobile power use is 18650 battery.

　　Lithium-ion batteries are currently commercialized as a cathode material. The theoretical capacity is 274mAh / g, the actual capacity is about 140mAh / g, and the actual capacity has reached 155mAh / g.

　　The cathode material has a high working voltage (average working voltage: 3.7V), and has stable charging and discharging voltage, small volume, high specific energy, good cycle performance, high electrical conductivity, simple production process and easy manufacture.

　　Main advantages: technology is mature, a wide range of applications, small size.

　　The main shortcomings: the life cycle of 300 or so, low security, anti-overcharge poor, not suitable for high-rate charge and discharge, after the pollution of the environment.

　　Second, nickel and cobalt manganese (LiNiCoMnO2)

　　Nickel-cobalt manganese, also known as ternary material (LiNiCoMnO2), is a polymer lithium-ion battery, a common form of soft packet shape. Note that lithium cobalt oxide can also be made into a box shape, but after molding is hard, pinch can be distinguished.

　　Ternary materials with the popularity of smart phones in the past two years the rapid development of the use of more and more areas. It is nickel salt, cobalt salt, manganese salt as raw material, the proportion of nickel-cobalt-manganese can be adjusted according to actual needs.

　　Ternary material to do positive battery lithium cobalt oxide battery relative to the high security, life is higher than lithium cobalt oxide, reached 500 times the use of cycle life.

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

　　The main drawback: higher prices, environmental pollution after the waste, high current charge and discharge performance is weak.

　　Third, lithium iron phosphate (LiFePO4)

　　Lithium iron phosphate chemical name ferroelectric, and the front two types of battery the biggest difference is that the battery cathode joined the iron element. Lithium iron in recent years has just started, is a very promising material, its safety performance and cycle life can not be compared to other materials, which is also the most important technical indicators of power battery. Charge and discharge cycle life of 2000 times, a single battery over-voltage 30V does not burn, puncture does not explode.

　　Lithium iron phosphate cathode material made of high-capacity battery easier to use in series to meet the needs of frequent electric vehicle charge and discharge, and has a non-toxic, non-polluting, safe performance, wide range of raw materials, cheap, long life, Is a new generation of lithium-ion battery ideal cathode material.

　　At present, ferroelectric high-capacity electric buses, signal base station energy storage and large-scale UPS applications, including mobile power, AA batteries have just begun to test the water mass production, which makes ferroelectric gradually in the large-capacity UPS, small energy storage battery , Caoping Deng, power tools are widely used.

　　Main advantages: 2000 cycles life, high current charge and discharge, less resistance to heat less, safe, environmentally friendly non-toxic.

　　The main drawback: expensive, digital products have not yet been used in large-scale, low-recognition of the minds of consumers.

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