Although it was just a simple test, it was enough for him to confirm that the problem was here.

No wonder ethylene carbonate is one of the causes of lithium dendrites and lithium precipitation problems in lithium-ion batteries. This additive is still widely used in lithium batteries.

It's not that a more suitable material can't be found, it's that it is the most suitable.

Ethylene carbonate at a certain content can not only increase the performance of lithium batteries, but also automatically execute planned scrapping work to make way for the next generation of products, earning a lot of extra money.

Take mobile phones as an example. The lifespan of a mobile phone battery is about one to three years.

The average selling price of a battery is between 150 and 300 yuan. After excluding all costs, it can bring at least 50 to 150 yuan in net profit.

If one billion people use mobile phones, that would be a net profit of 50 billion to 150 billion.

In fact, the consumption of batteries in various countries around the world is much greater than the corresponding number of people. After all, one person can own mobile phones, computers, electric cars, and other electrical appliances that require batteries at the same time.

No wonder that after the lithium dendrite problem is solved in the future, ethylene carbonate will still be widely used in mobile phone batteries.

This huge profit will tempt everyone.

Of course, the performance of ethylene carbonate itself is also excellent enough. Compared with other additives, it is more suitable for this new type of artificial SEI film and can bring greater performance improvements.

The better the battery, the more people will buy it, even if it is more expensive.

And no battery manufacturer would not love such an 'almost perfect' additive.

But for consumers, this is a very frustrating thing.

After all, the increase in consumer spending is real, but it can all be avoided.

...

After determining that reducing the ethylene carbonate content could improve the Coulombic efficiency of the battery, Xu Chuan began to arrange for other researchers in the laboratory to conduct more detailed tests on the battery in hand according to the standard testing of lithium batteries.

This chapter is not finished yet, please click on the next page to continue reading the exciting content! Battery testing is a rather tedious and lengthy process.

From electrical tests such as overcharge, over-discharge, external short circuit, forced discharge, etc., to mechanical tests such as extrusion, acupuncture, impact, vibration, and drop...it takes a lot of time.

Not to mention anything else, the charge and discharge test alone needs to be done at least 500 times.

IEC stipulates that the standard cycle life test of lithium batteries is: after the battery is discharged to 3.0v/unit at 0.2c, it is charged to 4.2v at 1c constant current and constant voltage, with a cut-off current of 20ma. After being left aside for 1 hour, it is then discharged to 3.0v at 0.2c (

One cycle) After repeated cycles 500 times, the capacity should be more than 60% of the initial capacity.

In other words, even if the charge and discharge test is carried out for 20 hours around the clock, it will take at least 20 days to a month.

However, these are nothing compared to the huge benefits that lithium batteries can bring.

As for himself, he had other arrangements.

He needed to find a material that could reduce the lithium evolution effect of ethylene carbonate.

Judging from previous experimental results, the content of ethylene carbonate is directly related to the lithium evolution of the negative electrode. Experiments show that the more ethylene carbonate added to the electrolyte, the faster the lithium evolution rate of the negative electrode will be.

Reducing the content of ethylene carbonate can indeed weaken the rate of lithium evolution, but it will also cause the overall performance of the battery to decline to a certain extent.

This is what Xu Chuan doesn't want to see.

Therefore, it is also important to find another additive and control it.

Xu Chuan did not give this job to Sichuan-Hai Materials Research Institute.

Perhaps the Chuanhai Institute of Materials can experiment with the required additives bit by bit, but it may take several months or one or two years. For Xu Chuan, this is too slow.

He is going to use his mathematical skills to complete the calculation of this additive!

I haven’t studied mathematics for a while, and I don’t know if my mathematics ability has deteriorated.
Chapter completed!