"But the shortcomings of oxides are also very obvious. Compared with sulfides, the conductivity of oxides is still too low. This leads to the performance release of solid-state batteries using oxide system materials that cannot meet the requirements of our mecha project. need.
Moreover, a series of problems such as capacity and rate performance cannot be solved at all due to the limitations of material properties.
In addition, there is an unavoidable technical problem, that is, the materials in the oxide system are very hard, which leads to the problem of 'solid-solid contact' in solid-state batteries that cannot be properly solved.
This is a flaw that cannot be ignored for combat equipment such as mechas and small aircraft that require high maneuverability and stability. "
What does it mean that a newborn calf is not afraid of tigers?
That's it.
As a new engineer in the mecha research and development department, He Xu has almost no qualifications in front of Professor Qin in terms of qualifications.
But he dared to directly refute the professor's research line.
And he didn’t let it go for nothing. The solid-state battery industry does seem to be booming, and there seems to be new discoveries every day. However, due to material issues, there is really no one that is both safe and can guarantee high-power output energy. Storage material appears.
As for the "solid-solid contact" problem of oxide solid-state batteries raised by He Xu, it is indeed a long-standing problem in the industry.
Oxide particles exist in point contact. Under simple room temperature cold pressing, an all-solid-state battery made of oxide will be a battery with very high porosity.
In a liquid battery, all pores are soaked with electrolyte, so there is no problem with interface contact, but in a solid-state battery, these pores cannot conduct lithium.
These core issues lead to the strongest form of solid-state batteries, all-solid-state batteries unlikely to be dominated by oxide materials.
Professor Qin was not angry at this newborn calf. He first nodded and admitted that the problems raised by He Xu could not be properly solved, and then said: "The current scientific research frontier at home and abroad is actually still moving in the direction of solid-liquid mixing. That is to say, both a solid electrolyte layer of oxide and an electrolyte immersion solution are used to fill the pores and give it a complete lithium conduction channel.
And if we follow this route, we can upgrade the factory and manufacture it in a short period of time after we have commercial or practical results.
There are some things that you are young and don’t know much about. Here I can reveal to you a reason for taking this route, that is, our four domestic leading solid-state battery companies Yanjing Weilan, Suzhou Qingtao, Ningbo Feng Lithium, and Liuqiu Province Huineng, they are currently taking the route of solid-liquid mixing technology based on oxide materials.
We, Jiuzhou Technology, have made brilliant achievements in using semiconductor technology to lead the collective upgrading of Daxia’s semiconductor industry. Once our solid-state battery technology can be commercialized on a large scale and is reliable enough, it will definitely set off a revolution in Daxia’s energy storage industry in a short period of time. Wave of reform! "
Professor Qin, who had already completed his first year of study, looked excited when he said this.
Faced with this kind of scientific research veteran who has devoted his entire life to the industry and hopes that Daxia can reach the top of the energy storage industry, He Xu, a newborn calf, also has his own persistence.
He argued rationally: "But the current problem is that we must complete a real solid-state battery in a short time! The mecha project cannot wait, the starship project cannot wait, and there are many other projects that cannot wait!"
I know that the team you led brought a lot of patents with them when they entered the company, but we can't just sit on our laurels and look forward! "
In fact, He Xu said this for some reasons.
In the eyes of the older generation of scientific researchers, the mecha project is just a toy project.
Let these bosses devote their energy to the energy storage equipment of the mecha project? That's the equivalent of asking a top engineer to design a toy car for a kindergarten kid.
Just give me a face and let you use the patent.
The progress of solid-state batteries has accelerated recently, and that is because of the huge requirements of aerospace, a super-large project.
But this is one of the conflicts of ideas between young people and the older generation.
Lao Shoucheng prefers to spend time on strategy and overall planning. This has a high success rate, but requires patience.
Young people are like the scorching sun, the rising sun in the morning. They know that they need to go to the scorching sun at noon. They are not willing to wait too long, even if they know that waiting is correct.
But most people really don't want to wait that long, and as time goes on, more unplanned changes are prone to occur.
For example, the mysterious deaths of many energy executives in Mao Xiong in recent years, and the increasingly turbulent international situation.
More and more engineers and scientists are becoming anxious. They want to advance the project in hand as soon as possible, and then move on to the next one, and the next one. They will not put down their anxious hands until it is completely safe.
As for how to realize a pure solid-state battery, Gu Qing, sitting below, actually already has a rough blueprint in mind.
It's just that this kind of thing can't just let him be the pioneer. It's best to need an opportunity to come up with ideas, then correct the direction of this big project, and then scientifically divide it into small projects, and then a One by one, these engineers and scientists were put into the positions they should be placed in, and all aspects were taken into consideration.
And I can sit quietly in the back among the patent signatories and big project reports, and watch with the satisfaction of an "old father" on my kids as they dazzle the world.
After briefly looking at the recent R&D logs of Professor Qin and He Xu, Gu Qing stood up.
At this time, the solemn atmosphere in the conference room also changed because of Gu's actions.
Without exception, everyone focused their attention on him.
As soon as Gu Qing stood up, he felt so many eyes on him, but he was not timid. He said to the two people who were arguing: "You two, don't argue in useless places. Every technical discussion and advancement on energy is useful." , and the company attaches equal importance to energy projects and mecha projects.
Modern industry cannot do without energy, and the mecha project is not just for entertainment and special operations needs. "
After Professor Qin and Engineer He Xu met their eyes, they paused for two seconds. Then they looked at Gu Qing in unison and nodded.
What Mr. Gu said does make sense.
After the two of them calmed down a little, Gu Qing came out and said to everyone: "The mass production of safe all-solid-state batteries has always faced many difficulties, but the semi-solid batteries mentioned by Professor Qin are compatible with existing liquid batteries. Process equipment and materials can be mass-produced at a lower cost, which is a basic condition for market application.
After more than ten years of rapid development, our colleagues in Daxia have significantly reduced the cost of liquid lithium-ion batteries, while the energy density continues to increase. Now the solid-state batteries produced by Daxia companies have become the mainstream of the global automotive power battery market. product.
But at the same time, new energy vehicles and equipment equipped with liquid lithium-ion batteries have become more prone to fire and explosion accidents in recent years.
Our engineer once told me that the explosive power of a 18650 model lithium battery is no less than that of a small hand grenade, and the reason why it does not cause as much damage as a small hand grenade is simply because it is restrained by a steel shell.
The two biggest reasons why we develop solid-state batteries are that they are very safe, and their energy storage and discharge performance can be of the highest quality. I have read the recent reports on several of our projects, and I can clearly see that the current research and development situation is far from this. There is still some distance between the two goals.
And even if they are not commercial products, just laboratory products, they are not the kind that can be mass-produced by developing a comprehensive product. "
Gu Qing said this to all the people in charge of the solid-state battery project.
Although his tone was somewhat harsh, no one dared to speak against him.
In recent years, Jiuzhou Technology has produced solid-state batteries, but to be precise, they are solid-liquid hybrid products, and the manufacturing cost is much higher than those of major manufacturers manufacturing batteries with the same performance, so they are just pseudo-mass production.
Many members and teams of the solid-state battery project team in the energy storage department have relied on the exaggerated resource investment and R&D equipment within Jiuzhou Technology to produce some products that look good in terms of data under ideal conditions in the laboratory.
However, without exception, those products are not feasible for commercial and special use. They are "flowers in the greenhouse" and cannot be taken out for viewing at all.
Gu Qing walked onto the podium, and Professor Qin naturally gave up his position as the lecturer.
Clicking on the temples of the glasses, using the projection of the SR1 glasses, and using the void gesture to drag the file to the blackboard behind him, Gu formally faced the crowd and spoke about his thoughts.
“I think that solid-liquid hybrid is not a transitional technology for these companies, and it can even be said that it is already a type of solid-state battery, but this is for those companies that cannot adopt all-solid-state battery technology.
I personally understand the thoughts of these companies. After all, liquid lithium batteries have gone through decades of research and development and production before finally forming a cathode material system composed of ternary/lithium iron phosphate, and the negative electrode is iterative to silicon-based.
But in terms of the theories put forward in the first generation of these products, these companies' decades of research and development are still standing still and have not surpassed the first generation theory.
At present, the energy density of liquid lithium-ion batteries has reached 300Wh/kg, which is almost reaching a theoretical limit. The next step or next generation of batteries must develop solid-state batteries.
When a research laboratory of our Jiuzhou Technology Titanium Star Department was developing some equipment and materials for carbon-based semiconductors a few years ago, there was a material that might allow all-solid-state batteries to completely replace the electrolyte and separator while allowing positive and negative Extremely active materials will also maintain the original material system. "
As soon as Gu Qing said these words, many people who were still sitting immediately stood up.
Even Professor Qin, who had just walked down and sat down, stood up energetically and looked at him.
Among the people present were the old man from the Xia Academy of Sciences, the master of the Xia Institute of High Energy, and a group of Ph.D.s who were in no way inferior to foreign elites in scientific research.
At this moment, they all held their breath and stared at Gu Qing's mouth, trying to use their eyes to pry out from Gu Qing's mouth what they had been pursuing for years and decades.
Anhetang, who had just returned to work for a day, was already familiar with this scene, but still subconsciously became nervous.
Because the looks in the eyes of these scientific madmen made him a little scared.
Gu Qing didn't give in. He clicked on the file, and the SR1 glasses verified the scleral password before decrypting the file.
"This document is quite large. It contains not only the analysis of solid-state batteries, but also speculation and preliminary research on projects in the battery field such as fuel cells and power batteries."
We designed high-performance ASCs by using polyaniline-loaded graphene-wrapped polyester fibers as flexible electrodes and bacterial cellulose (BC) nanofiber-reinforced polyacrylamide as hydrogel electrolytes. It combines arbitrarily deformable textile electrodes with BC-reinforced hydrogels with high ionic conductivity (125 mS cm-1), high tensile strength (330 kPa), and superelasticity (stretchability up to ≈1300%) Together, the result is a device with high stability/compatibility between electrodes and electrolyte, perhaps enabling solid-state batteries to show great potential in a truly wearable application context, relying on the efficient design of a sufficiently robust energy storage device. ! 】
[The negative electrode material of solid-state batteries may be a mixed negative electrode of nano-silicon and graphite, and the positive electrode may be lithium manganate, a lithium-rich manganese-based material, or a lithium-free positive electrode material. Then the electrolyte is a solid electrolyte, and its energy density can be 300-450Wh/kg. Then the next generation will be lithium-sulfur batteries or lithium-air batteries in the future.
[For example, when developing high-energy-density all-solid-state or solid-liquid hybrid batteries, the positive electrode material is still high-nickel ternary, the negative electrode material is still graphite or silicon carbon, etc., copper-platinum and aluminum-platinum are still used in the positive and negative stages, and the roll-to-roll process and The battery assembly process will still not change much. 】
[Through rare earth ion doping and rare earth ion coating of electrode materials, the structure of the electrode material is stabilized, the electronic conductivity and ion diffusion of the electrode material are improved, and the electrochemical performance of the electrode material can be effectively improved. The electronegativity and ion size of rare earth ions are key factors in regulating the performance of electrode materials for lithium-ion batteries and supercapacitors. 】
…
"That's right! If you make a multi-layered honeycomb three-dimensional complex porous structure, and use these gaps as deposition spaces for metallic lithium, you can use graphene materials with excellent scaffold strength to ensure that the negative electrode material is not compressed during assembly. bad."
"Old Li, you are thinking too superficially. This honeycomb-like three-dimensional porous structure can effectively solve the problem of spatial changes in metallic lithium batteries during charge and discharge cycles, while preventing separation and disconnection between different material layers of the negative electrode."
"Yes, yes, the superior structure can give full play to the characteristics of the material, and at the same time, it can also provide the material with a better environment. Yes, yes, and there is more than one structural conjecture? They actually thought of this structure? Wait, turn slower!"
"Mr. Gu! Stop! Wait a moment!"
“It’s almost done, it’s okay, I think it’s okay, but it’s not okay!
Wait a moment!
"
A group of people seemed to have been starving and thirsty in the desert for several days, and even the refugees who quenched their thirst with urine suddenly saw a Manchu banquet and a pile of iced watermelon fruits and cold drinks. Their eyes were no longer green, but The greedy desire for endless longing.
Even those old men who had been sitting in Xia Ke Academy and watching the industry for many years almost took out the notebooks in their pockets at the same time, scribbling notes and looking at the data to record notes.
