After the matter in the capital was over, Liu Qianqian went to visit Yang Chunhe's house before leaving, after all, this time the house was thanks to Yang Chuxi, otherwise, she didn't know when she would be able to buy a suitable house.

Of course, in return, Liu Qianqian gave Yang Chuxi a piece of information, information about lithium-ion batteries, she reviewed the books she had read about chemistry, it seems that there is still a certain lack of lithium-ion batteries.

Not only China, but also foreign countries are just starting. The content is not very perfect, because in her opinion, the lithium-ion battery they are researching is really like a child's house, thinking of Yang Chuxi, she prepared this gift.

Lithium-ion batteries have high energy density, with volume energy density and mass energy density reaching 450W.h/dm3 and 150W.h/kg, respectively, and are still improving. The average output voltage is high (about 3.6 V), which is three times that of Ni-Cd and Ni-MH batteries. And the output power is high. It has small self-discharge, high charging efficiency, long service life, and low environmental pollution, and is known as a green battery, so there will be great prospects for lithium-ion batteries in foreign countries.

Yang Chuxi is a college student in the Department of Chemistry of Beijing University, it is said that his grades are good, as if he is preparing for the graduate school entrance examination, lithium-ion batteries can be used as his graduate school subject, if he can study it, it will be beneficial to himself or the country, of course, how Yang Chuxi handles that information, Liu Qianqian will not force it, but according to Uncle Yang and Yang Chuxi's temperament, they will definitely choose to turn it in.

As expected, when Yang Chuxi saw the information that Liu Qianqian gave her, he was extremely shocked, especially his research direction is also related to the battery, he naturally knows the importance of lithium-ion batteries, especially the development prospects of lithium-ion batteries in the future.

The information given by Liu Qianqian not only has a complete experimental design, but also a large number of chemical calculations, and he knows that if it can really be developed, their country will definitely lead the world level in this area.

Seeing this, Yang Chuxi held back the shock in his heart, he told his father Yang Chunhe about it, and after Yang Chunhe listened, he was silent for a while before he spoke, "I will report this matter, this information is temporarily placed here for me, and it will be placed in the follow-up research and development issues, I think the above has its own arrangements!"

Yang Chuxi nodded, he knew the priority of the matter, so naturally he would not be dissatisfied, Yang Chunhe nodded with satisfaction, locked the information in his cabinet, and prepared to wait for tomorrow morning to report this matter to the leader.

......

"Liu Qianqian, don't you really need us to send you back to the five counties?"

"Teacher Zhao, don't worry, I will arrive home safely and there will be no problems!"

Seeing this, they could only nod, but they didn't know, in fact, as early as when Liu Qianqian was about to go back to the five counties, there were people on the train who secretly protected Liu Qianqian, although Liu Qianqian had Sonic No. 1 on her body, but the value of Liu Qianqian's performance, the leaders did not dare to let Liu Qianqian act alone, they were all their own people within a certain range, so they would be so relieved to let Liu Qianqian go back alone, of course, except for the uninformed Teacher Zhao.

"Sister Sissi!"

"Sister Sissi!"

Liu Qianqian was just about to enter the train station, and suddenly heard a milky voice, Liu Qianqian turned her head to see that it was Pei Jianjun's child, the moment she saw Pei Jianjun, Liu Qianqian patted her forehead, she was busy all this time and forgot to promise to visit the little guy, I hope the little guy will not be angry!

"Sister Sissi!"

"Junjun, are you here to see off your sister?"

Pei Jianjun nodded, and then pursed his mouth, "Sister Qianqian doesn't mean what she says!"

Liu Qianqian touched the little guy's head apologetically, "Junjun, I'm sorry, my sister is too busy, so I forgot, when my sister is admitted to Beijing next year, I will definitely see you!"

The little guy's eyes lit up, "Really?"

"Really!"

"Retractor hook!"

"Okay, let's pull the hook!"

Liu Qianqian looked at Wang Zhenrong, "Aunt Wang, thank you for bringing Junjun over to see me off!"

"We should thank you!"

Wang Zhenrong's impression of Liu Qianqian was originally very good, and later she knew that Liu Qianqian won the championship on behalf of the national team, so she had a better impression of Liu Qianqian, and her son liked this little girl so much, Wang Zhenrong would naturally release her greatest kindness.

"Aunt Wang, next year's college entrance examination, I will definitely come to Beijing, and I will visit when the time comes!"

"Waiting for you!"

Wang Zhenrong nodded, Liu Qianqian hugged the little guy, and then when the little guy was about to cry, he decisively entered the train station, although he bought a lot of things, but all of them were mailed back, so Liu Qianqian only had a small backpack on her body, which was the most relaxed passenger.

Liu Qianqian looked at her seat number, and in the No. 7 car, she successfully found her seat number, Liu Qianqian took out a math book from her backpack, and then put the backpack behind her, and then sat on the bed and began to read.

She is doing a soft sleeper, and she is in the room so far only her, I feel pretty good, when the train opens, there is no one in the room, Liu Qianqian knows that this may be specially arranged from above, Liu Qianqian is not disgusted, looked around, closed the door of the carriage, began to read intently, and when she was hungry, she took out some small jerky or small snacks to feed her stomach, not to mention how leisurely this little day is.

On the other side of the carriage, Yu Che looked at the middle room with a curious expression, and asked with some puzzlement, "Brother Mu, what did you say about that little girl, the two of us were actually looking for the two of us to protect a little girl, and asked you to come here, could it be the child of a big family?"

"That's not right, even if it's a child of a big family, it's impossible to send the two of us over!"

Mu Hancheng had a cold face the whole time, and didn't say a word, he wasn't curious, but the duty of a soldier is to obey orders, when he saw the little girl in the photo, Mu Hancheng felt a sigh in his heart.

Isn't this little girl the little girl she met in Harbin City last year, and she actually asked herself to protect her, as far as he is concerned, that little girl's skills are not simple, maybe who protects whom, Mu Hancheng glanced at Yu Che.

"No, Brother Mu, what kind of eyes are you?"

Mu Hancheng still didn't speak, closed his eyes and recuperate, Yu Che pushed open the door, wanting to take a look, he was really curious, he hadn't walked out yet, Mu Hancheng's voice sounded coldly behind him.

"Don't mess with that little girl, you're no match for her!"

Yu Che looked incredulous, "Brother Mu, aren't you funny, although I am worse than you, but I am also the third in our falcon, you say that I am better than that little girl?"

Mu Hancheng stopped talking, Yu Che couldn't make up his mind for a while, so he could only close the door, although he didn't believe it in his heart, but thinking that Brother Mu had always disdained to lie, maybe that little girl was really a big person.

Yu Che said that he was cowardly, and the main boss only let them protect secretly and not be discovered, if it was really like what Brother Mu said, wouldn't it be very embarrassing to be discovered.

Although Mu Hancheng has been closing his eyes and recuperating, he is also guessing Liu Qianqian's identity in his heart, and the request made by the above is that the little girl will never be allowed to be hurt at all, especially her head, this seemingly strange order has made him feel a little clue, but he is not a curious person, as long as he completes this mission!

Liu Qianqian's train trip is very stable, and because there is no one in the carriage, Liu Qianqian's trip is very comfortable, when she sees the familiar scenery, Liu Qianqian has never been as excited as this moment, she quickly packed up her things, and then waited at the door of the carriage early, waiting for the train to stop, the conductor opened the door, Liu Qianqian couldn't wait to get off the train, and when she got off the train, she saw Liu Chengzhuan and Wang Cuiju in the station.

"Dad, mother!"

Liu Qianqian immediately ran over, Wang Cuiju hugged the girl who ran over, "It's back, you girl, are you playing wild outside, you don't want to go home?"

"No, I miss you so much!"

"It's good to be back!"

Liu Chengzhuan nodded, although it was not as obvious as Wang Cuiju's performance, but Liu Qianqian still saw the joy in Liu Chengshuo's eyes.