Chapter 383 Formation

With Wu Tong in charge, guiding the direction with the right context, the research and development of lithium negative electrode materials for new energy batteries has made visibly good progress. After continuous experiments, inferences, and adjustments, the research team, led by Tao Ran and Ruan Chengxu, finally focused on C2H6OSi and dimethyl silicone oil.

This is a high molecular polymer that is used in various fields such as medicine, daily chemical products, food, and construction. Under the guidance of Wu Tong, the research team found that when dimethyl silicone oil is treated by special synthetic means and then spin-coated in a nitrogen-filled glove box to form a coating, it will effectively suppress the shuttling effect of lithium dendrites, thereby enabling the lithium negative electrode material to truly exert its excellent performance.

The appearance of dimethyl silicone oil is a colorless, transparent volatile liquid to a very high viscosity liquid or silicone. It is odorless and highly transparent. It is heat-resistant, cold-resistant, has a small viscosity change with temperature, is waterproof, has a small surface tension, and has thermal conductivity. The thermal conductivity coefficient is 0.134-0.159W/(m·K) and the light transmittance is 100%. Dimethyl silicone oil is non-toxic and odorless, has physiological inertness, and has good chemical stability.

It has good electrical insulation, weather resistance, hydrophobicity, and high shear resistance, and can be used for a long time at -50℃～200℃. It has excellent physical properties and can be directly used for moisture-proof insulation, damping, shock absorption, defoaming, lubrication, polishing, etc. It is widely used as insulation lubrication, shockproof, oil and dustproof, dielectric fluid and heat carrier. It can also be used as defoaming, release agent, paint and daily chemical additives.

They will focus their attention on this material, that is, to determine the solution as coating and look for suitable coating materials. This is one of the options screened out. They value the material's good weather resistance, electrical insulation, chemical stability, and physiological inertness.

After a series of experimental screenings, they carried out in-depth development of this material, and finally came up with nano-breathing dimethyl silicone oil, referred to as C2 coating material.

The final appearance of this material is a paste with extremely high viscosity and silver-yellow color. When applied to a targeted position, it will quickly solidify. During this period, the special nano-breathing effect can play a stable role in curbing the formation of lithium dendrites after certain treatment.

Dimethyl silicone oil is very commonly used in the world, and what is special is the special synthetic preparation method. Of course, although the performance of the special material after treatment is excellent, this layer of coating material alone is definitely not enough to solve the lithium dendrite problem that has plagued the world for many years!

The most critical technology is actually a special combed carbon nanolayer derived by Wu Tong in the end. It uses a special dislocation combing method to smooth out the shuttling effect of lithium ions and ultimately isolate the formation of lithium dendrites, making the use of new energy lithium batteries possible in reality.

"Boss Wu, we succeeded?" Tao Ran couldn't help but beam with joy as he looked at the data displayed on the rechargeable battery tester. It had been a full forty-eight hours, and not only had no lithium dendrites been produced, but even the Coulomb efficiency had remained at an extremely high level. This was truly the breaking point of the lithium dendrites!

The new energy lithium battery has completely broken through the upper limit and has great potential.

"The experiment proves that we are right!" Wu Tong nodded with a smile. Actual testing reveals the truth. After a month and a half, they have indeed developed promising breakthrough materials for new energy lithium batteries, the C2 coating and C1 carbon plate.

If C2 coating is used alone, the lithium dendrites caused by the shuttle effect can be suppressed, but deposition will occur on the surface. In the long run, it will definitely affect the battery and reduce its lifespan accordingly. However, compared with before, it is a world of difference. This little problem can be basically ignored for current battery manufacturers and current new energy electric vehicle manufacturers.

However, Wu Tong always strives for perfection, so, on the basis of coating, Wu Tong sought to solve the deposits, which could smooth out the shuttle effect and sort out the deposits produced by the analysis effect of lithium ions during the charging process.

She read in the latest literature that the current lithium-sulfur battery field is trying to fix the positive electrode material, sulfur composite material, in the intervening carbon port to solve the shuttle effect caused by the dissolution of polysulfide in the lithium-sulfur battery reaction. At the same time, it is possible to improve the conductivity of the positive electrode and the utilization rate of sulfur.

Many attempts have been made, including using a porous conductive carbon skeleton to disperse active sulfur into the carbon material, improving the dispersibility of elemental sulfur in the composite structure, and using the pore structure to adsorb polysulfides to limit their precipitation from the composite structure, thereby improving the efficiency of the electrode reaction.

Wu Tong was inspired by this and further deduced the honeycomb porous combing negotiation. He used the special porous design of the carbon plate to impact the negative electrode with lithium ions. Combined with the coating material, he finally formed a perfect lithium dendrite treatment solution, allowing lithium metal to be successfully used as the best negative electrode material and perfectly exert the excellent performance of lithium batteries!

"We have created another miracle, Mr. Wu, we have created another miracle!" After Wu Tong nodded in affirmation, the core team members who cooperated with the experiment could not help but cheer throughout the laboratory.

Their eyes were fixed on the ten groups of test experiments on the laboratory table. In their eyes, the six groups that did not produce lithium dendrites were no less than looking at rare beauties. In fact, beauties were nothing but dry bones to them. Instead, these represented the progress of scientific research and the results of their learning and progress, which made their eyes shine even more.

"Boss Wu, Boss Wu, you are omnipotent! Wherever Boss Wu points, he is invincible!"

"Okay, okay, everyone continue to record data and repeat the experiment. We need more test data to verify the stability of this solution. Stop trying to fool me!

Once we have sorted out the proper data, I would like to ask for credit for everyone. The patent share reward for C2 coating materials will be paid to everyone after it is put into production!"

Wu Tong laughed. She didn't suppress the young team's active joy. So, after letting the team rejoice, she issued new requirements. If she let them flatter her again, she would really think that she was an omnipotent god!

But how is that possible? She is still in the mortal realm, and all her breakthroughs come from the accumulation of knowledge, not breakthroughs out of nothing!

The success of one experiment is not a complete basis. The accumulation of multiple stable test data is the real effective experimental data. They first conducted ten groups of comparative experiments, four groups of coating plus carbon plate, four groups of coating combination, and two groups of ordinary solution processes. The two groups of ordinary graphite solutions for comparison completed the task early, which was a sharp contrast!