The mobile phone screen is larger, the screen resolution is higher, the camera pixel is higher, and the number of CPU cores is more, The battery brother on the side was very depressed: "Other brothers are making their own contributions to the differentiation of the competitive advantage of smart phones without affecting the external image and extreme feel of smart phones, and I am really sorry for dragging you down."

Since the advent of smart phones, battery life has become the main weakness of smart phones. It is also an issue that industry people have been discussing, and it is also an issue that major mobile phone battery manufacturers are eager to solve. This website has also done an article about Future batteries But it will take some time to use it on mobile phones, not to mention batteries in the future. Who knows when the future will be? In fact, we can't blame the battery brother for the poor battery life. Everyone knows that today's mobile phones are equipped with lithium batteries. Let's first look at the basic principles of lithium batteries:

Basic principle of lithium battery

Lithium metal battery is a kind of battery with lithium metal or lithium alloy as anode material and non-aqueous electrolyte solution. The earliest lithium battery uses the following reaction: Li+MnO2=LiMnO2, which is redox reaction and discharge.  

Basic principle of lithium battery
The reaction on the positive electrode is: LiCoO2=charging=Li1-xCoO2+XLi++Xe (electronic)
The reaction on the negative electrode is: 6C+XLi++Xe===LixC6
Total battery reaction: LiCoO2+6C=Li1-xCoO2+LixC6

Cathode material: There are many cathode materials available. At present, most mainstream products use lithium iron phosphate. Comparison table of different cathode materials:

Positive reaction: lithium ion is embedded during discharge, and it is de embedded during charging.
During charging: LiFePO4 → Li1 xFePO4+xLi++xe-
Discharge: Li1-xFePO4+xLi++xe - → LiFePO4
Negative electrode material: mostly graphite.
Negative electrode reaction: lithium ion is disconnected during discharge and inserted during charging.
When charging: xLi++xe -+6C → LixC6
Discharge: LixC6 → xLi++xe -+6C (Via Baidu Baike)

Lithium ion batteries have the characteristics of high voltage, high capacity, low consumption, no memory effect, pollution-free, small size, small internal resistance, less self discharge and more cycles. Because of these characteristics, it is widely used in the items that we need in our daily life. In the era of functional mobile phones, these characteristics of lithium batteries are enough to ensure normal life for everyone. However, in the era of smart phones, because the power consumption of various components is increasing, lithium batteries have made men form a good habit of charging at home every day.

As can be seen from the above figure, the battery capacity of each gram of positive material is limited, and the battery volume must be increased to increase the battery capacity.

Xiaobian has interviewed many manufacturers of mobile phone batteries, and they all think that lithium battery It is already a very good product to make mobile phone batteries at present. It is not impossible to increase its capacity. The capacity of the battery is in direct proportion to the volume of the battery. However, many manufacturers now require smart phones to be thin and light. To increase the battery capacity of the phone and enhance its endurance, the size of the phone will undoubtedly become larger, which will have an impact on the appearance of the phone.

The reason why mobile phones have not made progress in battery life is that there is no new battery material with small size and large capacity that can replace lithium batteries. It is unknown when a breakthrough can be made in the new battery material.

In this way, I just said that the battery brother has done his best. As a mobile phone battery, it also wants to bring greater convenience to everyone, just because of the bottleneck problem of battery materials, I can't do anything about it. Now we can only look forward to the emergence of a god like figure to discover new battery materials and apply them to people's lives.

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