Chapter 197: Only familiarity In the living room, Ermao was jumping around on the luggage bag and having a lot of fun. "Silly cat." Xu Qingzhou complained, stood up, packed his luggage with Song Yao, and went back to their rooms. Xu Qingzhou didn't have much stuff, so he finished most of it in half an hour. There was only one-third of the wardrobe left, and it looked empty. "Should I buy some clothes?" After thinking about it, he shook his head again, thinking that these clothes were just right, so as to avoid trouble when moving next door. The two rooms are facing each other, and you can see the opposite house when standing at the door. Seeing that there were still two large bags of unpacked luggage in Song Yao's room, Xu Qingzhou walked over with a smile and asked, "Do you want me to help?" "Bang~" Song Yao's door closed. "." Standing behind the closed door, Xu Qingzhou had a strange look on his face. If he saw it correctly, there were some small, intimate clothes placed on the bed?
hiss~ I have to say, the style is pretty good. He touched his nose. God can tell you that he really just wanted to help. Now that he was okay, the pink thing kept lingering in his mind. With a dry cough, Xu Qingzhou's expression straightened and he knocked on the door again, "You really don't want me to help you?" "No need!" A girl's angry voice came from the room. Haha, I knew I would be rejected, but I just wanted to ask. Xu Qingzhou didn't ask any more questions. He might get beaten if he continued teasing. He had nothing to do, so he cleaned the living room and then leaned back on the sofa to read a book. Er Miao jumped next to Xu Qingzhou, lay down and fell asleep, its furry tail sweeping across his legs from time to time. At 5: in the afternoon, the two went out and ate at the Farm Restaurant. Song Yao went to class while Xu Qingzhou went to the library to read. Wednesday flew by. The next day, Xu Qingzhou got up very early. Song Yao got up even earlier than him and was already sitting at the table reading a book. After Xu Qingzhou finished washing up, the two went to the cafeteria to have breakfast together, and then went their separate ways to start a busy day. Xu Qingzhou went straight to the optoelectronic laboratory. Now that the time difference had been adjusted, it was time to start the experiment. Today's main task was to prepare BiBO crystals, which was expected to take at least 24 hours. Try to finish it by tomorrow morning and start the experiment. Ren Xiaoling arrived quite early and waited for Xu Qingzhou downstairs of the laboratory building. The two of them went into the laboratory building together. In the optoelectronic laboratory, Hong Yayu is using a scanning electron microscope (SEM) to examine sample fragments, while Gong Yunfei is taking notes beside her. Gong Yunfei was as enthusiastic as ever: "Junior brother, are you ready to make the fourth sample?" Hong Yayu nodded as a greeting to Xu Qingzhou. Xu Qingzhou said: "Yes, the experiment has been suspended for a long time. If we don't come now, we will fall behind in the progress." "I'm going to Cambridge to attend a lecture. Junior brother, I'm tired of saying the word awesome." Gong Yunfei's face was full of admiration.
Xu Qingzhou smiled modestly. Both sides were busy, and everyone quickly began to focus on the work at hand. The preparation steps of BiBO crystals have not changed much. They still need to be mixed according to the stoichiometric ratio of BiO:BO=1:3, but the amount of raw materials needs to be controlled to ensure that the grown crystals can meet the experimental requirements after cutting. Xu Qingzhou skillfully put the evenly mixed raw materials into the crucible for melting. After 3 hours, a seed crystal is introduced to allow the melt to gradually crystallize on the seed crystal and grow into a single crystal. Before the crystal is fully formed, the temperature gradient, melt flow rate, and pulling rate must be controlled, so Xu Qingzhou has to stay in the laboratory. Ren Xiaoling followed Xu Qingzhou faithfully, staring at the furnace without blinking, and was extremely confused. For example, the pulling rate and other things, the junior brother did not follow the plan, but looked at the parameters and adjusted them on his own. In response to her doubts, Xu Qingzhou had only four words to say: It’s just a matter of practice. In other words, experience and knowledge reserves are very important. For example, he only needs to take a look at the state of the crystal to know that the temperature should be increased. After all, the growth rates at both ends of the polar axis are very different, which may cause the crystal morphology to deviate from the equilibrium state and form defects. At 11 ., the crystal growth entered a stable period. Xu Qingzhou was not so nervous and chatted with Gong Yunfei who was idle at the side, "Where are Professor Zhao and Senior Brother Wang?" Gong Yunfei said: "In the electrification workstation next door, cyclic voltammetry tests are carried out on silicon-based composite negative electrode materials." "Are there results so soon?" Xu Qingzhou was surprised. Gong Yunfei shook his head and smiled bitterly: "It's just a discarded sample. There is too much lithium precipitated and it can't be used at all. They just want to check where the problem is." Xu Qingzhou knew this thing. The dendritic metallic lithium formed by the uneven deposition of lithium ions on the surface of the negative electrode, whether it is the dendritic lithium dendrites or the metallic lithium in different forms when appearing on the negative electrode side, is collectively called lithium deposition. The growth of lithium plating is one of the factors affecting the safety and stability of batteries. After several years in the future, this problem has been effectively solved, but unfortunately, Xu Qingzhou has not studied it in depth, so he can only tinker with it when he has time later. "The process of failure is the process of accumulating experience. Maybe there will be progress soon." Xu Qingzhou comforted with a smile. Gong Yunfei sighed: "Junior brother, you still have a good attitude." Xu Qingzhou thought that if he had a bad attitude, he would have been depressed to death from those repetitive experiments. After the crystal was formed, the rest of the time turned into boring waiting, so Ren Xiaoling went back to revise her thesis. Xu Qingzhou had no choice but to continue guarding here. During the growth process of the crystal, it would be relatively fragile in the early stages. If something went wrong somewhere, several hours of effort would be wasted. He asked Senior Sister Hong Yayu to borrow a book on lithium-ion solutions to supplement his knowledge in this area. At noon, Professor Zhao Shengwen and Wang Wei came back, but unfortunately, they had to test for another day to find the results. Professor Zhao asked everyone to go over the information again to see if there were any problems with the steps. Seeing that Wang Wei and the others were busy, he finally had time to come over and talk to Xu Qingzhou: "Xiao Xu, are you looking at information on lithium-ion solutions?" "Yes, I plan to find out." Xu Qingzhou nodded. Professor Zhao smiled and said, "This thing will definitely be a hot topic of research in the future. If you are interested, then... Xiao Gong." "Professor." Gong Yunfei responded. Professor Zhao ordered: "Give Xiao Xu a copy of the paper and data we prepared." "Okay." Gong Yunfei replied.
"Thank you, professor." Xu Qingzhou was a little surprised, because these materials were the laboratory's key confidential information. Professor Zhao Shengwen waved his hand and said, "It's just some information. I still trust your character." In addition to being optimistic about Xu Qingzhou, he also had some selfish motives. This subject experiment would inevitably require data analysis in the future, and there might be a need to trouble this kid. At this time, Xu Qingzhou also guessed some of Professor Zhao's thoughts. If there was anything within his ability, he would be willing to help. "Junior brother, give me the information." Gong Yunfei copied the experimental information to Xu Qingzhou. "Okay, thank you, senior brother." (End of this chapter)