Translator:Henyee TranslationsEditor:Henyee Translations
Lu Zhou replied, Let me do it.
The system did not specify who must do the experiment, only that he must collect the data. However, for the purpose of learning, Lu Zhou decided to do it himself.
After all, he had to have hands-on experience in order to become a legendary high tech master.
When Lu Zhou wore the white coat, he felt like a little scientist. He then took a deep breath before he reached for the sample box containing the experiment materials.
However, his hand was pushed away by Brother Qian.
Let me do it, just watch.
Brother Qian took the initiative for the experiment while Lu Zhou watched from aside.
Lu Zhou looked at Liu Bo who merely shrugged.
Dont take it to heart, hes just like this. The equipment here is like his wife. Its more important than his life Just watch him do it.
Brother Qian then said, Doing experiments isnt like mathematics, you cant make any mistakes. Of course, I was afraid that youll break the equipment Show me your experiment design.
Lu Zhou took out the A4 paper and said, Its right here.
The experimental steps and data required by the system were written on there.
Brother Qian brother took the A4 paper and nodded as he said, The design is quite professional.
Its designed by the system.
Lu Zhou did not say anything.
The experiment flow was simple. They should start with the battery and observe the phenomenon.
95.7% of graphite was used as the negative electrode material, and the binder was sodium carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR). The current collector was a copper foil. The graphite layer had a thickness of 90 m, the positive electrode active material used LiFePO 4, and the current collector was aluminum foil.
As for the separator, a three-layer separator of Celgard 2325 was used, and the thickness was about 25 m.
To prevent oxidation of the material, everything was done in an argon-filled glove box.
Of course, it was not only to prevent oxidation of the material but also to prevent the LiPF6 component in the electrolyte from reacting with water in the air to form hydrofluoric acid.
Even high school students knew about hydrofluoric acid.
The stuff was dangerous. If it got on someones hand, the hand would be destroyed beyond recognition.
Brother Qian did the experiment professionally.
Soon after, the sample was made.
In order to prevent the sample from being damaged, the side-to-side assembly method was used. Brother Qian completely covered the LiFePO4 material with a layer of the separator, and carefully left the free end of the positive and negative electrodes at a distance of 2 mm.
This step was crucial.
Brother Qian took out the sample and exhaled a long breath.
As Lu Zhou looked at the sample in Qian brothers hand, he asked, This is the battery?
Brother Qian brother replied in a concise manner, A simple and unsafe lithium-ion battery.
Lu Zhou asked nervously, Will it explode?
Brother Qian shook his head, It wont explode, but it might ignite.
A fire would cause big trouble.
Not only would the sample be destroyed, but the digital microscope would also be burned.
Lu Zhou guessed that this was one of the reasons why Brother Qian did not let him touch the equipment.
The sample was connected to the BK-6808 rechargeable battery tester and then placed on a digital microscope. Brother Qian set several parameters to the computer and said, The data collection frequency is 1 Hz, and the battery is discharged to the cut-off voltage. Wait for it to be charged for 400 minutes
Now, all they had to do was wait.
Lu Zhou looked at the instrument and asked, Do we have to wait that long?
400 minutes was almost seven hours.
Brother Qian pushed his glasses and said, 7 hours is the basic operation. Sometimes it takes days to see the results. Normally one person will stay in the lab. Ill usually take turns with Liu Bo.
Liu Bo replied, Thats right, last year I watched more than 40 TV shows while waiting in the lab. Do you want me to recommend you some?
Lu Zhou, Theres No need for that.
He did not have time to watch TV shows.
After doing the necessary steps, Brother Qian briefly taught Lu Zhou about what to do in an emergency.
For example, what do to when the sample was smoking or smelled weird, how to clean the damaged sample, and most importantly how to protect himself.
No matter how expensive the equipment was, it was not as valuable as ones own life.
Of course, the experiment was not that dangerous, so Brother Qian was confident to give Lu Zhou the key.
He still had some stuff to do with Liu Bo, so they could not stay here.
Lu Zhou sat next to the digital microscope and pulled out a quantum physics book. He would study quantum physics and occasionally looked at the digital microscope.
Later, he found out that he did not have to be so careful. The sample under the microscope did not change at all.
It seemed that Brother Qians experimental skills were quite reliable.
Lu Zhou stayed in the lab all day, and he even called delivery for lunch.
Finally, the time was up. The discharge time was over. Lu Zhou waited for 10 minutes and kept the circuit open before he cut off the power.
He was almost finished with the experiment when he suddenly heard footsteps outside the lab. Liu Bo had just eaten dinner at the cafeteria before he returned to the lab.
As Liu Bo looked at the sample, he asked, Done?
He then skillfully operated the computer and said, Then lets collect the data.
The printer started to hum.
Soon after, Lu Zhou received what he wanted.
A set of pictures showing the growth of lithium dendrites under microscopic conditions as well as graphs such as cyclic voltage curves that the system required him to collect.
Liu Bo started chatting to him.
Lithium is the most ideal anode material, but its also the most difficult to charge. When charging, the lithium ion that returns to the negative pole will never change to a flat lithium metal layer. Like a flower, itll form a beautiful and deadly tree.
Lu Zhou looked at the printer and asked, Is it fatal?
Yes, once this kind of dendritic thing is formed, itll continue to grow with constant charge. Itll eventually puncture the diaphragm and contact the positive electrode like a fork.
Liu Bo paused for a moment before he said in a joking manner, Imagine if you connected the positive and negative poles of a battery, it would short circuit. Have you heard of the Moli company?
Liu Bo shrugged and handed the printed A4 paper to Lu Zhou as he said, Their products almost created history, but because of the use of lithium as the negative electrode, a major accident occurred. The NTT mobile phones were recalled. Finally, the company went bankrupt and was acquired. In contrast, Sony was very smart. They used graphite directly as a negative electrode, and the introduction of lithium-ion batteries quickly took over the market.
Lu Zhou could not help but ask, Did they not do a safety test?
Liu Bo sighed and said, Yeah, everyone asked that. But things are not that simple. Maybe they didnt find any problems at all? Or maybe they thought they found a perfect solution? Who knows?