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Over the past few years, the technology of power batteries has advanced by leaps and bounds, but hidden dangers and mileage anxiety are still difficult to get rid of. At the same time, solid-state batteries have become the new favorite of the industry in the debate and questioning, and the future of solid-state batteries has gradually become clear with the entrance of various giants.

On January 9 this year, NIO (NYSE:NIO) released a high-profile 150kWh solid-state battery pack with an energy density of 360Wh/kg on its NIO Day, and the battery pack of NIO ET7 sedan will last more than 1000km, which is impressive.

The heat of NiO has not subsided, Volkswagen Group in its March 15 Power Day, said that the future will focus on the development of solid-state battery technology, and Volkswagen directly threw out the goal more simply: it is expected to start using solid-state batteries in 2025.

In April, the BMW Group, not to be left behind, also gave a plan for solid-state batteries: it plans to launch a prototype car with solid-state batteries by 2025, and achieve mass production by 2030.

Not only car companies, power battery giants are also in the layout of solid-state batteries: Ningde era invested 3.3 billion to build 21C innovation laboratory for the next generation of battery research and development such as lithium metal batteries and all-solid-state batteries; LG Chem said it will commercialize all-solid-state batteries between 2025 and 2027. Panasonic plans to launch an electric car using a solid-state battery in 2025.

For a time, solid-state batteries have become the invisible battlefield of industrial giants, and solid-state batteries have become the highland that giants will fight for

. Why are solid-state batteries so attractive, and what is the current development progress?

[1] What is a solid-state battery?

Solid state batteries sound mysterious, and it is simple to understand with traditional liquid lithium batteries, because they work in the same way. Traditional liquid lithium batteries are also known as "rocking chair batteries" by scientists. The two ends of the rocking chair are the positive and negative two of the battery, the liquid electrolyte and the diaphragm in the middle, and the lithium ion is like the "athlete", the athlete runs back and forth at the two ends of the rocking chair, and the battery charge and discharge process is completed.

When it comes to solid-state batteries, the "athlete" still runs back and forth between the positive and negative ends, the difference is that the sports field has changed from a liquid electrolyte to a solid electrolyte. In addition, the solid electrolyte also plays the role of separating positive and negative, that is, it plays the role of a diaphragm, so the solid-state battery no longer needs a diaphragm.

In terms of composition alone, solid-state batteries are simpler.