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The comparison of three common batteries in power bank Nov 07, 2017

Let's mainstream mobile power battery material used, and for now, the main material of the mobile power batteries are divided into three types are: lithium cobalt oxide batteries, nickel-cobalt-manganese batteries, lithium iron phosphate batteries . These three kinds of material batteries can actually be collectively referred to as lithium batteries, the following first come a small science-what is the power of these batteries it!


Lithium cobalt oxide batteries:

commonly known as the enlarged version of the battery, 18650 batteries

18650 batteries.jpg

18650 batteries

Lithium cobalt oxide batteries is characterized by its stable battery structure, high specific capacity, outstanding overall performance, the standard voltage of 3.7V. However, its safety is poor, and the number of cycles of batteries is relatively low, only about 300 times. Widely used in notebook batteries (thinner will use polymer batteries), before there are some mobile power lithium cobalt batteries, such as: a meter of mobile power is the use of the material (10000mAh for example ).


Nickel cobalt manganese batteries: now the mainstream polymer batteries

Polymer batteries.jpgLI-Polymer batteries.jpg

Polymer batteries

Nickel cobalt manganese batteries is what we often call polymer batteries, polymer lithium ion polymer to be replaced by colloidal. This polymer is "solid" or "colloidal", and its service life than the 18650 cell has improved to more than 500 times, a higher safety factor, but also the most widely used a battery material, Now the mainstream of the new mobile power manufacturers will use the material batteries. However, this battery will also pollute the environment after being discarded.


Lithium iron phosphate batteries: "iron" batteries, the recent emerging materials

Lithium iron phosphate batteries.jpg

Lithium iron phosphate batteries

This lithium iron phosphate cell battery is a new battery in recent years, can be said that for the time being the best safety performance of the product. The number of charging cycles has reached about 2000 times, and high security, and no pollution, but this battery for mobile power, there are two fatal drawbacks, that is bulky, and the price is high, these two factors For the time being, the cell batteries are rarely used in mobile power supply, the battery is now mainly used in electric vehicles, small storage batteries, lawn lights, power tools and other bulky tools.


In order to facilitate the users to watch, the following table directly put these three batteries to make a comparison, so that users at a glance their strengths and weaknesses.

The comparison of three common batteries in power bank


Lithium cobalt oxide

nickel cobalt manganese

lithium iron phosphate

Voltage Platform (V)

3.6

3.5

3.2

Gram capacity (mAh / g)

135~140

100~115

130~140

Specific surface area(m^2/g)

0.4~0.6

0.2~0.4

12~20

Tap density (g / cm ^ 3)

2.8~3.0

2.0~2.3

1.0~1.4

Battery cycle times

>=300次

>=500次

>=2000次

Charging speed

slow

fast

Very fast

Self-discharge

higher

lower

lowest

Memory effect

no

no

no

Transition metal

poor

poor

rich

manufacturing cost

low

high

Very high

Environmental protection

Containing cobalt

Containing nickel, cobalt

Non-toxic

safety

poor

good

excellent

Now the field of application

Small battery

Small battery / power bank

Large capacity power bank