We not only require the creation of energy storage systems with high power storage capabilities, but also ensure the safety and long life of the system.

After all, the power system is no better than that of an electric vehicle, and it is impossible to replace the battery pack every few years.

After determining the previous goals, the project team first conducted research on the equivalent circuit model of the battery pack.

Regarding the positive electrode material of the battery, Xu You basically confirmed that the positive electrode material of the same style as the Fulong mobile phone is used.

This material can ensure that the battery has a very high energy density, and no other better materials have appeared in the industry.

But in the process of finding suitable negative electrode materials.

The entire project team did not reach an agreement.

Commonly used carbon negative electrode materials, including graphite, soft carbon and hard carbon, etc.

There is no problem with these materials as negative electrode materials, but there is no too prominent part in performance.

Xu You and some members of the project team hope to use a negative electrode material with better performance—

Graphene.

Graphene and graphite have a very delicate relationship.

Simply put, if graphene is superimposed layer by layer, it is graphite.

Compared with ordinary graphite, graphene has a larger specific surface area, a more open layer structure, greater conductivity, and better flexibility.

These excellent properties make graphene very suitable as a material for energy storage and conversion devices.

But at the same time, some properties of graphene itself will cause some repulsion reactions between it and lithium ions.

This makes it difficult for graphene to appear as the negative electrode material for lithium batteries.

Regarding this question, Xu You consulted many experts in relevant domestic fields, but none of them received any ideal responses.

"It's a pity that with my current brain power, I can't prepare to simulate the same situation in my brain."

If an expert can provide Xu You with some more detailed information, Xu You will be confident that through the ability of brain simulation, you can find a more suitable method to solve the problem.

"By the way, ask Professor Wei Zhou."

At this time, Xu You thought of the one of the world's best materials experts who are now working on the other side of the ocean.

During the online exchange with Wei Zhou, Xu You experienced Wei Zhou's strong academic ability.

Xu You believes that Wei Zhou is on the same level as Schultz of Germany and a real material expert in the world.

However, Schultz's research field is more inclined to metal materials, while Wei Zhou's research field is mainly in nanomaterials.

As far as Xu You knows, Wei Zhou has made great achievements in the research on graphene.

Wei Zhou had previously specifically explained to Xu You that he could contact him at any time as long as Xu You needed it.

As long as it is a problem that Wei Zhou can solve, Wei Zhou will definitely not reserve any reservations.

Thinking of this, Xu You decided to ask Wei Zhou for help with this question.

After all, in the field of graphene, Wei Zhou must be much better than himself.

Before Xu You wanted to send a message to Wei Zhou.

Xu You suddenly thought of Chen Pingqiu.

"It's better to report this matter to the upper house."

Although Xu You has a good impression of Wei Zhou, he also believes that Wei Zhou is really a person worthy of his trust.

However, Wei Zhou was on the other side of the ocean after all.

If you contact him casually, you may have some unexpected risks.

After Xu You reported to the upper house, the above quickly gave a reply.

It is okay to communicate with Wei Zhou, but it is limited to communication with corresponding academic issues. Try not to say anything else.

The entire communication process also requires screen recording or audio recording throughout the process.

After confirming all the precautions, Xu You sent a message to Wei Zhou.

As promised before, Wei Zhou attached great importance to Xu You's request and immediately agreed on a time with Xu You.

Due to the time difference, in order to ensure that the work and rest of the two people are not affected, the communication time is set in the morning of Jijing time.

"Professor Wei, we are thinking about whether graphene has the possibility of being the negative electrode material of lithium batteries. In our experiments, it was found that lithium ions cannot be stored in single-layer graphene. I wonder if Professor Wei is a researcher in related aspects?

”

"Professor Xu, we have indeed encountered this phenomenon you mentioned. Because of its many excellent properties, graphene is theoretically very much a negative electrode material for lithium batteries. But this phenomenon seems to negate the graphene's this phenomenon

application."

Xu You noticed that Wei Zhou used the word "seem" in his just expression.

In this way, Wei Zhou should have found a solution to the problem.

"Professor Wei, can you tell me about your strategies for dealing with it?"

"Of course, I will definitely know everything about Professor Xu. As long as you make some defects in the monolayer graphene, lithium ions can be stored in the graphene."

"Creating...some defects?" Xu You said in surprise.

After Wei Zhou reminded him, Xu You suddenly reacted.

This idea is indeed very imaginative, and Xu You has never considered this direction before.

"That's right, Professor Xu, as long as the single-layer graphene has some defects, the electronic structure of graphene can be changed to improve its lithium storage performance. I have done related research in private before, but have not published it yet.

.”

Xu Youxin said, no wonder no relevant information was found in the thesis library.

Next, Wei Zhou theoretically explained several methods to cause defects in graphene.

"It's too specific, please forgive me for not explaining it to you in detail. You still need to explore it yourself in the experiment."

"Of course, I am very grateful to Professor Wei for his ideas. Professor Wei, please rest assured that even if we study it, we will not publish the relevant results."

Xu You didn't know why Wei Zhou trusted him so much that he was willing to share with him without reservation even the results that had not been published publicly.

But no matter what, Xu You will definitely respect and protect Wei Zhou's intellectual property rights.

"Professor Xu, I still want to remind you about some things in advance. Although the lithium storage performance of single-layer graphene can be improved by artificially creating defects. But this does not mean that graphene can already appear as the negative electrode material of lithium batteries.

Now.”

"Professor Wei, please give me advice." Xu You said humbly.

"The existence of defects in graphene can improve the electrochemical properties of graphene. But at the same time, some irreversible side reactions will be introduced, affecting the life of lithium-ion batteries. None of the defect methods we have done are very good

This problem is good to solve. Compared with lithium batteries using other negative electrode materials, lithium batteries using graphene as negative electrode materials have a much shorter lifespan."

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