Cao Xun has already stated his attitude, so only Zhang Liu has not yet expressed his position.

At this time, Zhang Liu also expressed his attitude. "I don't have a problem either, I'll be there on time when the evening comes. ”

Since there is time, this celebration can be held normally, and now that the experiment has been initially successful, there will be no major breakthroughs in a short period of time, so there is no need to stay in the laboratory, after packing up the experimental equipment, Shang Yiyun followed the two out of the laboratory.

At this time, it was just noon, and there was still a long time before the evening, and Shang Yiyun didn't know what to do for a while, but there were still two classes in the afternoon, and he could go to the classroom to take classes, although going to the classroom was just doing other things, but at least there was something to do.

But it's noon, so he's going to go to the cafeteria for lunch, then go back to the dorm to take a break, and then he's ready to go to class.

Thinking of this, Shang Yiyun went to the first destination, the school's cafeteria, solved the problem of lunch, and then returned to the dormitory, lay on the lounge chair and closed his eyes and rested for half an hour.

Half an hour is enough, in the period before the class, Shang Yiyun turned on the computer and began to write the next experimental plan, the research of graphene vanadium oxide battery has achieved preliminary results, but there is still a long way to go before it is applied to actual production.

However, in a few days, with such results, Shang Yiyun was also very happy in his heart, otherwise he would not have proposed to have a celebration tonight.

He had already thought about what he needed to do in the next few days, so it was not difficult for him to write it on the computer.

An hour of time, all devoted to writing the plan, just like that, time passed minute by minute, and when there were still twenty minutes before two o'clock, Shang Yiyun turned off the computer, and then found a few books from the bookshelf and prepared to bring them to the classroom, these books were all borrowed from the library of Huaguo Normal University.

At this time, his roommate is also preparing to go to the classroom, so the whole dormitory must be neat and go to the classroom together.

On the way to the classroom, Shang Yiyun found that the trees on the side of the road were already covered with leaves, and he was full of life.

After enjoying the scenery on the side of the road, they didn't continue to pay attention, and it didn't take long for the four of them to come to the classroom.

This afternoon's class is two specialized classes, and there is only one class of students in the entire classroom, so during the class, what everyone is doing, the teacher can see at a glance on the podium.

Of course, Shang Yiyun also knew this situation in his heart, but he still went his own way and continued to read books in other fields, even if the teacher was standing behind him, he didn't feel it.

This teacher obviously knew Shang Yiyun, so after taking a look, he left.

The time of class, for Shang Yiyun, is not much different from reading books in the reading room of the library, but in the classroom, his action of flipping through books is much smaller, so it will not affect others.

The teacher also turned a blind eye to what Shang Yiyun did, and did not care too much, and the teacher also knew in his heart that the student in front of him could be called a demon, and the knowledge of this course had been mastered, even if it was him, it was slightly inferior.

There was such a wicked student in the class, and the teacher was also helpless, so he simply ignored it.

At this time, the book that Shang Yiyun read was related to graphene iron phosphate lithium-ion batteries, since graphene vanadium oxide batteries have made small achievements, he believes that the research of the second graphene battery is not far away.

Carbon-coated lithium battery cathode materials are an effective way to improve their electrochemical properties, which is mainly due to the improved conductivity of cathode materials, while graphitized carbon materials can improve the conductivity of cathode materials to a greater extent due to their higher conductivity.

However, it has been reported in the literature that when lithium ions pass through the non-defective graphite sheet, their diffusion rate is limited, which may reduce the electrochemical performance of the cathode material, so Shang Yiyun thinks that the effect of carbon coating on the electrochemical comprehensive performance of lithium iron phosphate cathode materials can be studied through graphene coating.

The effect of carbon coating on the electrochemical properties of lithium iron phosphate can be compared and analyzed by the idea of full graphene coating, partial coating and conventional amorphous carbon coating of lithium iron phosphate.

As for the experimental plan, he already has a prototype in his mind, but the most important thing now is to continue to study graphene vanadium oxide batteries to make this already small research more perfect.

The time of the two classes passed quickly, and seeing the other students leave the classroom, Shang Yiyun also stood up from his seat.

There is still some time before the evening, he is going to go to Huaguo Normal University during this time, get together with Chen Feiyun, and return the books he borrowed before back to the library by the way, he has read them all, and these books, left on his bookshelf, also occupy space.

On the way to Huaguo Normal University, Shang Yiyun first called Chen Feiyun to determine the location of the other party, otherwise he might make a fool of himself in the reckless past.

"Fei Yun, where are you now?" After the phone was connected, Shang Yiyun directly stated his purpose, and there was no superfluous nonsense.

"I'm in the dormitory now, what's the matter?" On the other side of the phone, Chen Feiyun was a little puzzled, not understanding what Shang Yiyun was calling her at this time.

Faced with this situation, Shang Yiyun told Chen Feiyun his intentions.

At this time, Chen Feiyun heard Shang Yiyun's words, and she was also very happy in her heart, because Shang Yiyun's reason was to get together with her, and she was naturally happy in her heart.

Shang Yiyun was also relieved when he heard that Chen Feiyun was in the dormitory, he was worried that the other party was not in school before, but now it seems that he is too worried.

Thinking of this, Shang Yiyun quickened his pace, preparing to rush to Huaguo Normal University within five minutes.

When he came to Huaguo Normal University, it was just 3:50 a.m., and he went directly to the downstairs of the women's dormitory to wait.

As soon as he found a place to sit down, he saw Chen Feiyun walking out of the dormitory building, seeing this situation, Shang Yiyun was a little surprised, before, he needed to wait for nearly ten minutes, but at this time, he did not wait.

Although he didn't understand why this was happening, Chen Feiyun had already come to his side, and he wasn't ready to think too much.

The two had already reunited, and Shang Yiyun was going to return the books he had borrowed from the library first, and then take the other party around the school.

In fact, the two don't care where they go, as long as they can be together, this feeling of companionship is what Chen Feiyun hopes to get, and now, she has gotten it.

After returning a few books back to the library, Shang Yiyun walked out of the campus of Huaguo Normal University with Chen Feiyun.

The two walked hand in hand on the path on both sides of the road, and at this time Chen Feiyun had a happy smile on her face, and she was very satisfied with the current situation.

When the two walked for a while, they found an acquaintance, Ma Xiaobo, a friend from high school, who had not seen each other for nearly a year, and the other party had changed a little bit, if it weren't for the person next to the other party who shouted his name, Shang Yiyun wouldn't be sure.

"Ma Xiaobo, is that you?" Shang Yiyun's voice was a little uncertain, after all, Huaguo is the world's most populous country, and there are many people with the same name and surname, if the other party is not his friend in high school, wouldn't it be very embarrassing to call the other party so recklessly, but when he meets someone so similar to Ma Xiaobo here, he naturally won't choose to ignore it.

At this time, Shang Yiyun noticed that the person in front of him stopped and turned around.

"Are you Shang Yiyun?" After the other party turned around, he also saw Shang Yiyun's appearance, and asked with some uncertainty.

Seeing this situation, Shang Yiyun finally determined that the person in front of him was Ma Xiaobo.

In the previous year, the two had been in contact on chat software, and had not met in reality, Shang Yiyun only knew that Ma Xiaobo was studying in Kyoto, but he had spent most of his time studying or doing experiments before, so he did not meet each other in reality.

Unexpectedly, when the two met again, it turned out to be in this situation, however, Shang Yiyun could feel that Ma Xiaobo seemed to have something to do, so he didn't force the other party to stay, but decided to find a time to have a meal together in the future, after all, they were friends from high school, since they were so fateful, they naturally wanted to get together when they had time in the future.

Seeing Ma Xiaobo's figure getting farther and farther away until he disappeared in front of his eyes, Shang Yiyun also felt a little emotion in his heart, the high school years have passed, and the friends from the high school days have also gone their separate ways, and being able to meet Ma Xiaobo here naturally evokes some memories of him.

However, now that Chen Feiyun is by his side, accompanying him, thinking of this, Shang Yiyun is also a little happy in his heart.

At this time, Shang Yiyun found that Chen Feiyun should be stunned in place, and he also knew in his heart about this situation that when he met Ma Xiaobo, it seemed that the other party also remembered some things from his high school days.

Faced with this situation, Shang Yiyun could only stop where he was and wait, and it didn't take long for Chen Feiyun to realize what had just happened, and looked at Shang Yiyun with some apologies.

Shang Yiyun naturally understood what Chen Feiyun meant, but he didn't blame Chen Feiyun, so he hurriedly said. "Fei Yun, I met Ma Xiaobo just now, which made you think of something that made you stay where you are, so you don't have to blame yourself, since you are out of your previous state, then let's continue to go. ”

When Chen Feiyun heard Shang Yiyun's words, the smile on her face became more and more intense.

In this way, the two of them walked along the road, and if they came across some small shops, they looked in them, and if there was something they liked, they bought it.

After shopping for an hour, perhaps tired of walking, the two went to the bubble tea shop to buy two drinks, and then sat on a stool to rest.

The two purposes of coming to Huaguo Normal University have been achieved, and next, he plans to send Chen Feiyun back to the dormitory, and then return to Kyoto University.

Just do it, Shang Yiyun told Chen Feiyun about his plan and waited for the other party's reply.

At this moment, although Chen Feiyun was not very happy in her heart, because she and Shang Yiyun had only met for an hour, and she was about to leave, so she was naturally reluctant in her heart.

However, Chen Feiyun also knew in her heart that Shang Yiyun had her own affairs, and she was not the kind of person who was willful.

In this way, after sending Chen Feiyun back to the dormitory, Shang Yiyun prepared to return to Kyoto University.

Walking on the road, Shang Yiyun kept thinking about his previous experiments and some knowledge he had seen in books.

One of the obstacles to the development of lithium batteries in electric vehicles is the slow diffusion of ions and electrons in the electrode material, and an effective way to improve this situation is to achieve the desired result by reducing the characteristic size of the electrochemically active material, because the ion diffusion time is proportional to the square of the length of the material.

In this regard, nanomaterials, including nanowires, nanotubes, nanoparticles, nanographene sheets, nanoribbons and other forms of materials, have been synthesized to improve the electrochemical performance of lithium batteries.

In order to further solve this problem, researchers use a variety of highly conductive three-dimensional structures as the current collector of nanomaterials, through which the battery can improve the charge-discharge rate and capacity loss, but the disadvantage of this architecture is that it will lead to a higher mass of some current collectors, thereby reducing the overall energy density of the battery, that is, the amount of electricity released per unit volume of the battery.

Moreover, the practical application of such complex structures, which are only used in experiments, is extremely limited.

Therefore, some researchers have proposed to use single-crystal vanadium dioxide and graphene cushion to construct a three-dimensional architecture, taking into account high diffusion efficiency and low molecular weight, and the reversible capacity of vanadium oxide-graphene cathode materials in lithium batteries at different charge-discharge rates.

The specific characteristics of this material are as follows: first, it enters the electrolyte through multiple channels to promote the rapid diffusion of lithium ions in the electrode material, second, the chemical properties of vanadium dioxide determine its short solid-state diffusion length, which shortens the time required for charging and discharging, third, based on the graphene network architecture, the electrode as a whole has high conductivity, and fourth, the coverage rate of the active material in the electrode reaches 84%.

The success of the research of graphene vanadium oxide battery is because he stands on the basis of his predecessors, and this knowledge is all obtained by him from books, so it is always right to read more books before the experiment.

I thought about it all the way, and when he returned to Kyoto University, he didn't continue to think about it.

Just when he wanted to go back to the dormitory, he found that his current location was very close to Chen Dezhi's office, seeing this situation, Shang Yiyun dispelled the idea of going back to the dormitory, and was ready to talk to his teacher instead.

As for his teacher not being in the office, just take a trip to find out.

After walking for half a minute, Shang Yiyun came to the door of the teacher's office, knocked on the door, and waited for a reply.

"Come in. A voice reached his ears, proving that there was someone in the office.

Thinking of this, Shang Yiyun pushed open the door and walked in, and when he entered, he found that his teacher was sitting on a chair and writing.