God-level selection: choose the college entrance examination full score at the beginning

Is it a lithium-air battery?

The electron microscope quickly scanned the structure of the battery in front of him. On the other side, Xiao u has already begun to display the internal structure of the battery on the display screen.

With curiosity in his eyes, Cheng Hao looked at the structure of the battery in front of him.

“what happened??”

Cheng Hao glanced at the structure of the battery in front of him, and a look of disbelief suddenly appeared in his eyes.

Because he discovered that in the battery in front of him, only the positive electrode had lithium metal reaction, while the negative electrode was abnormally empty!

Looking at the structure in front of him, Cheng Hao suddenly had a gleam of light in his eyes.

Could it be a lithium-air battery? ?

A gleam of excitement flashed in Cheng Hao’s heart.

The so-called lithium-air battery, as the name suggests, is a battery that uses lithium as the negative electrode and oxygen in the air as the positive electrode reactant.

Because oxygen is not limited as a positive electrode reactant, the capacity of this battery depends only on the lithium electrode, and its specific energy is 5.21kWh/kg (including oxygen mass), or 11.4kWh/kg (excluding oxygen).

Because lithium-air batteries do not contain solid matter in the oxygen section, their specific energy is extremely high, and the energy density that can be stored is naturally extremely high.

Theoretically, the energy density is far greater than that of lithium-ion batteries.

Naturally, performance is needless to say.

But in the scientific system of mankind, the current so-called lithium-air battery is just an idea, and most scientists are only theoretically explaining that this kind of battery may exist.

But at present, very few people are even able to make something similar in the laboratory.

After all, using oxygen as the positive electrode is still somewhat inconceivable based on the current human technology.

These thoughts flashed through Cheng Hao’s mind, but his eyes were still fixed on the screen. On the screen in front of him, the whole picture of the battery gradually began to appear.

But after seeing the whole picture of the battery, Cheng Hao frowned slightly.stand up.

Cheng Hao has studied batteries before. When he followed Academician Lin to make conductive coatings for lithium-iron batteries in the laboratory, Cheng Hao didn’t touch too many batteries.

But the structure of the battery in front of him is completely different from the image of the battery inherent in Cheng Hao’s mind, even if it is not the same as the lithium-air battery imagined by humans.

This…is a battery? ? ?

Cheng Hao frowned tightly.

It’s not that the structure inside is too complicated. On the contrary, Cheng Hao felt that the structure of the battery in front of him was too simple, so simple that Cheng Hao couldn’t believe it.

Is this really a battery? ?

Cheng Hao had some doubts, but soon, Cheng Hao eliminated the doubts in his mind.

Because when I extracted this thing from the system, the system told me that this was a broken battery.

Presumably, the system will definitely not make such a low-level mistake!

Maybe it’s because of the difference in energy storage methods? ?

Cheng Hao’s heart moved slightly.

As we all know, traditional lithium-ion batteries mainly rely on the movement of lithium ions between the positive and negative electrodes to work. During charging and discharging.

Li+ is intercalated and deintercalated back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

The battery is mainly composed of five parts.

Positive electrode — the active material is generally lithium manganese oxide or lithium cobalt oxide, nickel cobalt lithium manganese oxide material

Diaphragm – a specially formed polymer film with a microporous structure that allows lithium ions to pass through freely, but electrons cannot pass through.

Negative electrode–The active material is graphite, or carbon with a similar graphite structure, and the electrolytic copper foil with a thickness of 7-15 microns is used for the conductive current collector.

Organic electrolyte-a carbonate-based solvent in which lithium hexafluorophosphate is dissolved, and a gel-like electrolyte for polymers.

Battery casing–divided into steel casing (square type is rarely used), aluminum casing, nickel-plated iron casing (used for cylindrical batteries), aluminum-plastic film (soft packaging), etc., as well as the battery cap, which is also the positive and negative leads of the battery end.

And the special battery in front of him seems to have only three components.

The shell, some solid compounds, and then some special liquids.

Only these three components made Cheng Hao a little curious.

Either, this battery is a lithium-air battery, or, the lithium metal part is its negative electrode, and the liquid is its positive electrode.

Maybe, it’s time to test what these liquids are mainly about!

Thinking of this, Cheng Hao’s spirit lifted slightly.

I pondered for a while.

“Little u, give me a section of the liquid in the battery, open a small gap, take out some liquid, pay attention, if you find anything in a thin film state, stop immediately!”

Hearing Cheng Hao’s words, a mechanical arm next to him began to work slowly.

This is the importance of artificial intelligence. If it is replaced by a person to do this, it may be more troublesome. If it is replaced by a program to control the mechanical arm, it is too procedural, and there is no way to fully understand what you mean. .

And AI happens to be able to combine these two points very well.

Looking at the test bench, the mechanical arm carefully began to disassemble the battery.

The action was very slow, because Cheng Hao said before that the structure of the battery cannot be damaged on a large scale, but Cheng Hao seems to have never seen the alloy of the inner shell of the battery.

The more this happened, the more excited Cheng Hao became. These things are all new materials, new alloys!

In the field of materials science, human beings have not made major progress for a long time!

After calming down a bit, after Xiao u carefully opened a hole with a laser knife, a little bit of the metal cover fell off.

The other robot hand of Xiao u next to him has already taken this piece of metal and placed it in front of Cheng Hao’s eyes.

Cheng Hao observed the metal in front of him for a while.

“Silver, it seems to be shimmering with fluorescent light, and then there is a kind of lavender, it seems to contain metallic silver.”

Cheng Hao looked at the bit of metal in front of him and muttered to himself.

“Put this bit of metal on the metal analyzer and analyze it.”

Cheng Hao said to Xiao u.

Soon, this bit of metal was put on the metal analyzer.

Cheng Hao looked at the screen beside him.

“20% copper, 19% zinc, 15% carbon, 1% silver, 45% unknown????”

Looking at the data on the metal analyzer in front of him, Cheng Hao’s heart sank slightly. The thing he was most worried about was likely to happen.

Although I don’t know where this broken battery came from, but it is something produced by the system after all, and it certainly cannot be something from the earth.

Things from extraterrestrials, who knows how many metals there are in extraterrestrials that are not found on the earth!

If many of the batteries are made of metals that do not exist on the earth, then I have no way to restore this battery. I can only learn from some of the above physical properties…