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From mobile phones and digital products to electric vehicles and ships, lithium-ion batteries have played an increasingly important role in our daily lives. But in recent years, accidents caused by safety issues in lithium-ion batteries have also been impressive. Samsung mobile phone batteries caught fire and exploded, electric vehicles collided and even spontaneously ignited, and a lithium-ion battery fire accident occurred on the Boeing 787 aircraft, posing a new threat to processing and daily life. In addition to safety issues, lithium-ion batteries are often criticized for their limited range and cycling life. Can lithium-ion batteries be prevented from becoming a 'bomb' around people? How to crack the various "anxieties" caused by lithium-ion batteries?

2. How to crack the "anxiety" caused by lithium-ion batteries?

There are two issues at present, one is safety, and the other is mileage. Both safety and mileage issues are related to lithium-ion batteries.

Safety accidents in lithium-ion electric vehicles occur from time to time. Although their safety accidents are not as common as those in gasoline powered vehicles, they are a new phenomenon. Once a lithium-ion battery car burns or explodes, it spreads quickly online. This may affect the production and sales of lithium-ion battery electric vehicles. The mileage issue refers to the fact that the energy density of lithium-ion batteries is not high enough at present, and the driving range for a single charge is about 100 or 200 kilometers.

I think electric cars should be separated from electricity, that is, buying a car and buying a battery should be separated. It's best to buy an electric car. I go to work every day. If it's only 30 kilometers from Tiananmen Square to Tsinghua University or to the Fifth Ring Road, is it enough to buy a car that can drive 30 kilometers? It doesn't necessarily have to drive over 100 kilometers or 200 kilometers, which means installing 10 kilowatt hours of electricity is enough. So the cost of the car plus the 10 kilowatt hour battery will definitely not exceed 100000 yuan. I can buy a car for around 50000 to 60000 yuan. But what if I need to take a long-distance bus? Can I rent a battery while driving a long-distance car? That is to say, we need to establish a specialized battery company.

Actually, I don't advocate fast charging because the mechanism of lithium-ion batteries today determines that they are plug-in reactions, which means you need to allow the ions to have time to charge them. And the positive and negative electrode materials we use today are also good. The negative electrode material is made of graphite, which is a layered structure that only ions can face that layer. If the graphite happens to be perpendicular to its ions and cannot enter, it will have to rotate 90 degrees to enter. So you need to give it a time to rotate 90 degrees. If you don't give it a time to charge straight and quickly, it will not rotate and deposit on the graphite sheet, which is detrimental to the battery life. Similarly, when discharging, if the discharge rate is too high and too fast, it is not possible. It is also a layered structure. A positive material is also the same when it goes back. It needs to find the exact slit before it can enter, and if it cannot find it, it cannot enter. It also needs to wait for the opportunity before it can enter. So I don't advocate fast charging, I hope to replace the battery the most. It is possible to charge at an appropriate rate, but it is not possible with the express. The battery change mode is good, but it is quite difficult to do and the standards are not uniform. This must be considered by national unity, and it is difficult to do so if the country does not introduce policies for unified consideration.

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