Chapter 249

Xu Qingzhou stayed in the laboratory for 1 hour, and after the samples entered the long charge-discharge test, he left the laboratory to go next door to focus on his own tasks.

Although there is a lot of data, Gong Yunfei had already pre-processed it before, so he didn't need to screen the data first like before.

After thinking for a moment, Xu Qingzhou decided to finish the electrochemical model first.

Of course, because the working principle of the battery involves electrochemical reactions, this topic also involves chemical materials, but the core purpose of the experiment is through physical means.

For example, electrical testing, thermal analysis, material structure characterization, etc., to study and improve the thermal stability and energy density of lithium-ion batteries.

He has a slight involvement in chemistry, can't say he is good at it, but making a model or something is okay.

First, the solid-phase diffusion equation describing the process of lithium-ion diffusion inside electrode active material particles was described.

Xu Qingzhou flipped out draft paper and wrote down the formulas to be used.

Read! {

"Wait for me, let's go eat outside."

After breakfast, the two first cleaned up the hygiene.

Hehe, stinky couple.

"Hmm."

Besides this, it also involves specific formulas for activation polarization overpotential, such as using the Butler-Volmer equation to describe the electrochemical reaction rate on the electrode surface.

The above are all key formulas in the electrochemical model.

He fulfilled that sentence; he used to think he was a face-control, then thought he was a leg-control, then suspected he was a hand-control, until today he knew that he wasn't any control, just purely lustful.

Cooking, eating, the two huddled on the sofa watching TV, and called at night to ask if the zongzi bought for Old Xu and Old Song had arrived.

!.

9:30, the sun hung brightly in the sky, without the scorching heat of noon, falling on the ground through the leaves on both sides of the road, showing mottled halos.

Friday passed just like that.

Song Yao leaned on the sofa, legs on Xu Qingzhou's thighs, chatting with her little sister Ding Jiahui, talking about the route to Yandong Garden, and what dishes they planned to eat at night.

Xu Qingzhou really wanted to try, but after careful consideration, he gave up; his main task now is to get Polignac's conjecture done and raise the level of mathematics.

Lithium dendrites... this thing is quite challenging.

5 PM, Xu Qingzhou didn't stay in the laboratory, packed his things to meet up with Song Yao; Wang Wei and the others wanted to finish the experiment in one go today and enjoy the Dragon Boat Festival holiday tomorrow.

Xu Qingzhou and Song Yao walked out holding hands, slowly; unlike going to the library or class usually, there was a bit more leisure.

School Beauty Song also looked like she just woke up, the strands of hair on her forehead were still wet; seeing she seemed to intend to go out, Xu Qingzhou asked: "Are you going to buy breakfast?"

Wang Wei pointed to the dendritic scattered shadows in the picture and introduced to Xu Qingzhou: "This is lithium dendrite, one of the key factors affecting battery life and safety; currently there is no effective way to completely prevent the growth of lithium dendrites."

Some time ago, it was announced that the exponential ergodicity of the solution under the 1-Wasserstein distance was proved, and a criterion for the exponential ergodicity of Markov semigroups on Banach spaces under the 1-Wasserstein distance was proposed.

Xu Qingzhou was pinching his legs while looking at phone messages, only to find that a major event had happened in the mathematical world during this time, or rather, a competitor of his had appeared, a competitor for the Fields Medal.

Xu Qingzhou also put down the calculations at hand and followed Wang Wei and the others to look at the situation of sample No. 138.

According to Xu Qingzhou's past habits, it was usually when friends came over, or on cleaning days; now with School Beauty Song, cleaning is much more diligent, but still a lot of garbage was cleaned out.

4:30 PM, the printer next door buzzed, and data charts and structural diagrams of the battery interior were spat out from the printer.

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"However, our current samples, compared to the initial ones, lithium dendrites have decreased by 70%." Maximum capacity 4000mAh/g, 100mA, 16 cycles. Charge-discharge efficiency 92%.

Moreover, in actual experiments, due to the influence of factors such as the complexity and non-uniformity of the battery's internal structure, in most cases, these formulas need to be appropriately corrected and adjusted.

The whole model is of course not finished by splicing a few equations together; if it were that simple, Professor Zhao wouldn't have specifically asked him to come over.

This childish bickering attracted contemptuous glances from the single dogs nearby.

Xu Qingzhou originally wanted to sleep in, but after 9 o'clock he couldn't sleep at all, so he simply got up laughing; as soon as he pulled the curtains, the brilliant sunlight fell on him through the glass.

The most comfortable thing is the first night before the holiday. Xu Qingzhou and Song Yao also planned to have some ritual sense, not eating in the cafeteria, and made an appointment to buy some vegetables together, and get some bacon, four dishes and one soup.

"This kind of day is called life." Xu Qingzhou sighed again, pinched Song Yao's soft little hand; even though he could touch her legs now, he still liked her hands very much.

After cleaning up the hygiene, the two waste people who wanted to lie flat for a day huddled on the sofa to rest.

Just talking about the diffusion coefficient, the theoretical diffusion coefficient may not be able to fully reflect the actual diffusion behavior of the material, which requires obtaining the effective diffusion coefficient under different conditions through experimental data fitting, and inputting it into the model.

Wang Wei organized the drawings, "Let's go, finish the last set of experiments, and we can get off work."

Or occasionally participate in experiments in other physical fields like this, contact new things, and lay the foundation for becoming a pentagon warrior.

Young mathematician Jonathan Birmingham.

"Hmm."

"Hoo~"

There are also liquid-phase diffusion equations, solid-phase potential equations, liquid-phase potential equations, and electrochemical reaction equations.

The weather is very good; in the blink of an eye, it is already June; when entering July, that is called summer heat.

Ho, only 23 years old.

Hong Yayu nodded expressionlessly.

Song Yao glanced at the person beside her; this guy is not honest even when walking, so she pinched back.

Xu Qingzhou ran to the bathroom to wash up, washed his face and brushed his teeth, finished in a few clicks.

Xu Qingzhou nodded and said: "But the current growth situation still cannot meet the quality requirements of the battery."

Besides this, it also founded the theory of regularity structures; this theory is a generalization of the rough path theory of stochastic differential equations, involving modern mathematical theories such as model theory, Hopf algebra, partial differential equations, stochastic analysis, and nonlinear operations of generalized functions.

Xu Qingzhou exhaled slowly and clicked on the data chart.

Xu Qingzhou countered unconvincingly, Song Yao pinched back again, and the two just pinched each other like this.

Saturday.

"Hmm, yes, this is also one of the reasons we asked you for help; as you said last time, data won't lie, so we hope to find experimental loopholes from the data, how to control variables to inhibit the growth of lithium dendrites."

Wang Wei and Hong Yayu walked out of the laboratory and checked the material structure characterization map of the battery in front of the printer.

These equations are equivalent to the main frame of the building, and there are roof engineering, interior wall painting, etc.; only when these are fully completed can there be a complete building that can be used.

Currently, it has won many international awards such as the London Mathematical Society Whitehead Prize, Philip Leverhulme Prize, and Froehlich Prize.

Now it has become a hot candidate for the 2018 Fields Medal.

After reading this person's resume, Xu Qingzhou smacked his tongue; I have to say, this person seems to be more like a cheater than him.

Battle between cheaters.

(End of chapter)