Chapter 668: As long as we research it, isn't it a popular field?

Over the two days of the weekend, Xu Qingzhou ate and lived at the institute until the second week, when he finally sorted out the points needed for screening quantum dot composite materials.

"The quantum dot composite materials for the next experiments can be selected according to this standard."

In the office, Xu Qingzhou rubbed his temples and leaned back in his chair to relax his brain; he had been doing high-intensity calculations all morning, and his brain was already a bit numb.

Various complex formulas were written on the manuscript on the table.

The computer document was about the screening standards for quantum dot composite materials.

First, nitrogen doping; this thing can improve the conductivity and lithiophilicity of graphene.

Second, metal synergistic effect; it shows that transition metals like Fe/Co/Mn combined with carbon can lower the reaction energy barrier.

Third, quantum dot confinement effect; Professor Zhao Shengwen and the others verified that 1-5nm pores can inhibit the three-dimensional growth of lithium dendrites.

"Alright, time to get to work."

Drinking a sip of coffee to refresh himself, Xu Qingzhou called up the test that Wang Wei's group had just completed after 72 hours.

The test results for Wang Wei's group's FeCo-N@graphene quantum dots were out, and they had already completed the interface reaction products of FeCo quantum dots with lithium, and the morphology of the dynamic lithium deposition layer could be seen.

【Experimental group: —10mA/cm² for 72 hours without dendrite penetration.

Control group: Symmetric battery cycle life — polarization voltage >0.3V after 72 hours (short circuit failure).】

Experimental group: Lithium deposition layer roughness (Ra) — SEM shows Ra=3.8nm (initial Ra=2.1nm).】

"Facts prove that my previous calculations were correct; quantum dot composite materials are indeed worth pursuing."

Xu Qingzhou nodded and said, this type of material has a clear effect of inhibiting lithium dendrites.

Of course, FeCo-N@graphene quantum dot composite materials also have quite obvious pain points: after 500 cycles, the SEI layer thickens, the interface impedance is >100Ω·cm, impurity control is difficult, and thermal stability is poor.

These are the inherent shortcomings of FeCo-N@graphene quantum dot composite materials and cannot be compensated for.

"Must hurry and determine the other verification materials."

Xu Qingzhou perfected the plan in the morning and didn't waste time in the afternoon, immediately convening a meeting of the lithium dendrite group. It just so happened there were three directions, so he let the three sub-groups of the lithium dendrite group each be responsible for one.

"I believe everyone has already finished reading the materials I sent. The core logic of screening: the continuation of the advantages of nitrogen doping, the strengthening of the quantum dot confinement effect, and the integration of metal synergistic catalytic effects."

Xu Qingzhou got straight to the point and said: "I have now determined four types of quantum dot composite materials."

He opened the PPT: "Nitrogen-doped graphene quantum dot (N-GQDs) based composite materials, transition metal-titanium nitride quantum dot composite films..."

In the conference room, Xu Qingzhou explained the characteristics of the four materials one by one and then assigned the materials to each group in turn.

He required experimental plans to be submitted within a week.

The meeting ended.

"Have to work overtime for a while." Gong Yunfei closed his notebook.

Wang Wei smiled: "To be honest, don't even mention overtime; if we can get lithium dendrites sorted out, I could even live at the institute."

"Your awareness is too low."

Hong Yayu evaluated Gong Yunfei with a blank expression.

"Don't put pressure on me; I didn't say I wouldn't work overtime."

Gong Yunfei rolled his eyes. Overtime can be compensated with time off, there is overtime pay, and there are bonuses after the project ends; for someone like him who is about to get married, it couldn't be better.

After a pause, he sighed and said: "However, looking at the whole world, we really are leading the way, right?"

Last November, their technology was already able to bring the battery's energy density to 500Wh/kg.

These 5 months have seen quite a few new technologies.

Unfortunately, their energy was focused on lithium dendrites, and they didn't continue to conquer solid-state batteries, but in terms of lithium-sulfur batteries, the group of people in the shuttle effect group already had samples with an energy density of 800Wh/kg. ===== CHAPTER 669 =====