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We not only require an energy storage system with high storage capacity, but also ensure the safety and long life of the system.

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

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

As for the positive electrode material of the battery, Xu You is basically determined to use the same type of positive electrode material as the Fulong mobile phone.

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

But in the process of finding a suitable anode material.

The entire project team did not reach a consensus.

Commonly used carbon anode materials include graphite, soft carbon and hard carbon, etc.

There is no problem with these materials as negative electrode materials, but in terms of performance, there is nothing too prominent.

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, graphene is superimposed layer by layer, which is graphite.

Compared with ordinary graphite, graphene has a larger specific surface area, a more open layer structure, a greater electrical 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 repulsive reactions between it and lithium ions.

This makes it difficult for graphene to appear as an anode material for lithium batteries.

Regarding this question, Xu You consulted many domestic experts in related fields, but none of them got any ideal reply.

"Unfortunately, with my current brain power, I can't prepare to simulate the same scenario in my brain."

If some experts can provide Xu You with some more detailed information, Xu You is confident to use the ability of brain simulation to 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 material experts who is now working on the other side of the ocean.

In the previous online communication with Wei Zhou, Xu You had a taste of Wei Zhou's strong academic ability.

Xu You believes that Wei Zhou is at the same level as Schulz in Germany, and is 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 also made a lot of achievements in the research of graphene.

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

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

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

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

Just before Xu You wanted to send a message to Wei Zhou.

Xu You suddenly thought about Chen Pingqiu.

"It's best to report this matter to the higher authorities."

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

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

If you contact him casually, there may be some unexpected risks.

After Xu You reported to the higher authorities, the higher authorities quickly responded.

It is possible to communicate with Wei Zhou, but it is limited to the exchange of corresponding academic issues, and try not to say other superfluous things.

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

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 made an appointment with Xu You.

Due to the time difference, in order not to affect the work and rest of the two of them, the communication time was set in the morning of Jijing time.

"Professor Wei, we are thinking about whether graphene has the possibility of being used as an anode material for lithium batteries. In our experiments, we found that lithium ions cannot be stored in single-layer graphene. I wonder if Professor Wei is doing related research? "

"Professor Xu, we have indeed encountered the phenomenon you mentioned. Graphene is theoretically very suitable as an anode material for lithium batteries because of its many excellent properties. But this phenomenon seems to negate the graphene application."

Xu You noticed that Wei Zhou deliberately used the word "seems" in his expression just now.

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

"Professor Wei, is it convenient to talk about the strategy to deal with it?"

"Of course, I will know everything about Professor Xu. As long as there are some defects in the single-layer graphene, lithium ions can be stored in the graphene."

"Created... some flaws?" Xu You asked in surprise.

After Wei Zhou's reminder, Xu You immediately reacted.

This kind of thinking is indeed very unconstrained, and even Xu You has never thought about it in this direction before.

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

Xu Youxin said, no wonder no relevant information was found in the paper database.

Next, Wei Zhou theoretically explained several ways to make graphene produce defects.

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

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

Xu You didn't know why Wei Zhou would trust him so much, even willing to share with him unreservedly his unpublished results.

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

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

"Professor Wei, please enlighten me." Xu You said humbly.

"The existence of defects in graphene can improve the electrochemical performance of graphene. But at the same time, it will also introduce some irreversible side reactions, which will affect the life of lithium-ion batteries. The several defect methods we have done are not very good. Good solution to this problem. Compared with lithium batteries using other anode materials, lithium batteries using graphene as anode materials have a much shorter lifespan.”