Chapter 114 You have to believe in science (please recommend)
When Chen Xiao spoke, everyone was startled, and then all their eyes turned over.
"Who are you?" Luo Hao asked.
I'm a new student, isn't it obvious?
Wearing a camouflage uniform and a childish face, he looks like a freshman.
Chen Xiao said: "Are you doing experiments on lithium batteries?"
Luo Hao was impatient: "This is the material chemistry laboratory, freshmen should get out quickly."
Chen Xiao didn't mind at the time and said: "If you want to increase the energy density of lithium batteries, there are two ways. One is to change the materials of the positive and negative electrodes, and the other is to optimize the packaging of the battery."
"Are you making lithium cobalt oxide batteries? Are you making them according to Sony's 18650 battery specifications?"
The 18650 lithium battery is not a lithium battery made of a certain material, but the package size specification of the lithium battery set by Sony. 18 means 18mm in diameter, 650 means 65.0mm in height, and 0 means cylindrical battery.
Everyone originally thought that Chen Xiao was just a freshman who came to watch the excitement, but they did not expect that Chen Xiao could still tell some knowledge about lithium batteries.
Gao Miao asked: "Are you a freshman at the College of Chemical Engineering?"
When he asked this question just now, Gao Miao felt something was wrong.
Even if Chen Xiao is a senior student majoring in materials and chemistry, he should not know too much about lithium batteries, because freshman students generally study basic subjects such as advanced mathematics, physics, chemistry, etc., and do not involve in-depth professional knowledge.
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Gao Miao is now feeling very depressed and depressed.
Luo Hao's plan was to close the laboratory quickly and then accompany Gao Miao back to the dormitory.
Girls have the lowest defense ability when they are in a bad mood.
Luo Hao wondered whether he could hold Gao Miao's hand or give him a kiss when he sent Gao Miao back later.
As soon as Chen Xiao came, he talked for a long time, and there was definitely no drama left.
Chen Xiao said: "I am a freshman, majoring in finance, but I still have some small research on lithium batteries. Let's see if I can discuss it with my senior brothers and sisters."
After hearing this, the graduate students laughed immediately as the atmosphere was tense.
Freshman year, or finance major?
Are you now looking for a three-point graduate student to discuss your graduate thesis?
Luo Hao felt that it was not that he heard wrong, but that there was something wrong with Chen Xiao's brain.
Luo Hao walked over and said: "This is a laboratory, a graduate laboratory. Students without permission are not allowed to enter. Freshman students should go to the dormitory to sleep and join in the fun."
Luo Hao turned around and said to Gao Miao and others: "Okay, everything has been made very clear. Those who want to quit, quit. Those who don't want to quit, pack your things quickly and continue the experiment at nine o'clock tomorrow morning."
Luo Hao said to Gao Miao: "I will take you back."
Gao Miao glanced at Chen Xiao and regarded Chen Xiao as a freshman who came to watch the fun. He never thought about what issues he wanted to discuss with Chen Xiao.
Chen Xiao laughed helplessly and was a little speechless. He took the experiment notebook on the table and said: "What you are currently experimenting with is lithium cobalt oxide battery."
"Under the same volume, the energy density of lithium cobalt oxide batteries is indeed higher, but its high temperature resistance is not good and its safety factor is low! It is easy to BOOM."
"I briefly browsed your experimental records and found that you blindly changed the stabilizer ratio of the battery's positive electrode (cathode). With all due respect, this did not identify the key to the problem."
Chen Xiao put down his laptop and said: "You are producing according to Sony's 18650 structure. If the external voltage of the 18650 structure battery is lower than 2.7V or higher than 3.3V, overheating will occur. If the temperature gradient inside the battery is not well controlled, it will
There is a great risk of fire, and the key to battery technology is precisely voltage, current and heat control..."
"The theoretical density of lithium cobalt oxide is 5.1g/cm3, but due to technical reasons, for battery safety and to prevent battery explosion, we can actually achieve a maximum of 2.0-2.4g/cm3. This density is not actually high.
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"In addition, the electrothermal peak of lithium cobalt oxide is around 200, which is much lower than other cathode material lithium batteries. Although this kind of battery has high power, high energy density, and high consistency, it has a low safety factor and heat
The characteristics and electrical properties are poor..."
Chen Xiao talked a lot in one breath, and finally said: "Now do you know why the battery you are practicing has BooM? You have to believe in science!"
[Influence +5]
[Influence +3]
[Influence +1]
[Impact +0.01]
…
Chen Xiao received 5 influence points from Gao Miao, but only 0.01 influence points from Luo Hao.
Why is there such a big gap?
There is only one reason to explain.
Gao Miao is an academic master and knows his experiments and papers very well, so he can contribute a wave of influence.
And Luo Hao is just a scumbag, just here to make a difference. Although he is a graduate student, he doesn't know much about the field of his research. After Chen Xiao finished speaking, he looked confused and didn't know what Chen Xiao was talking about.
Luo Hao opened his mouth and said after a long time: "You are talking nonsense! You don't understand."
But Gao Miao knew that what Chen Xiao said was all about practical matters and very important knowledge. The data that came out of his mouth was something that Gao Miao could not find even if he checked the information!
Gao Miao didn't believe that Chen Xiao was just a graduate student majoring in finance. She quickly asked: "You mean, there is something wrong with the mix ratio of our cathode materials?"
Chen Xiao laughed and said: "They are all 16850 batteries. You only know the size of the battery, but you don't know what is inside the battery, how it is packaged, and what kind of separator is used."
"There is not only a problem with the positive and negative electrode materials, but also with the packaging."
Chen Xiao said: "I just saw your negative electrode material, which is to apply carbon powder on the copper foil. There is no problem with this, but why use ordinary carbon powder?"
Gao Miao has now completely become a seeker of knowledge, with a longing expression on his face, and his big eyes flickering at Chen Xiao, very cute.
Chen Xiao coughed twice. It was unimaginable that Gao Miao was actually a third-year postgraduate student. She was already 24 years old even though she was 18 years old. She was 6 years older than Chen Xiao. With such good looks, she could be considered a high school student.
Some people believe it.
Gao Miao was a little disappointed and said: "There are problems with the positive and negative electrode materials, and there are also problems with the packaging..."
Their team has been working hard for almost half a year, but they didn't expect that it was still full of loopholes in the eyes of others.
Although Gao Miao's mentor is guiding the experiment, lithium batteries are a cutting-edge subject in the world, and the technology is in the hands of Japanese people. Even Gao Miao's mentor can only help Gao Miao find some information at most, and there is not much that can be done to help.
The instructor even asked Gao Miao to change a topic, such as the impact of environment on lithium battery materials, etc., which was much less difficult.
Gao Miao suddenly said in a somewhat embarrassed and soft voice: "You...can you help me?"