Plasticine is an object that we are familiar with. When we squeeze it gently, we can pinch out various shapes. When we force a fall, it will quickly harden. The team of Cui Wei, a professor at Stanford University in the United States, took a look at the personality of plasticine, which is "soft or hard to switch freely depending on the size of the force," and used it as a protective coating for lithium metal battery electrodes, significantly improving battery cycle stability. Sex and safety. Related research results were recently published in the American Journal of the American Chemical Society (JACS), a leading international magazine on materials and chemistry.

The first author of the paper and a postdoctoral researcher at the Stanford University School of Materials Science and Engineering Liu Kai told reporters from the Science and Technology Daily that the battery capacity depends on the type of electrode material. Lithium-ion batteries commonly used in the market today use graphite as a negative electrode material. If it is replaced with lithium metal, its capacity can be increased by a factor of ten. However, the lithium battery has a "Holy Grail" is called the soft underbelly of lithium metal batteries: the microscopic shape of lithium metal will undergo dramatic changes during charge and discharge, resulting in the precipitation of lithium dendrite lithium metal. Lithium dendrites will not only reduce the capacity of the battery, but also may cause short circuit in the battery and induce safety accidents such as fire and explosion.

The results of the team's research show that applying a layer of plasticine with a thickness of only about 1 μm on the surface of lithium metal can protect the lithium metal electrode almost perfectly. In the normal charge and discharge process, lithium metal is uniformly deposited on the surface of the electrode, and the force acting on the plasticine is very small. The soft plasticine can be well adapted to the shape and volume change of lithium metal and firmly adhered to the surface of lithium to protect the coating. Once the lithium dendrites “spike out” in some areas, the plasticine coating quickly hardens, effectively blocking the growth of lithium dendrites. "The plasticine is equivalent to a smart coating, and its hardness can quickly respond to changes in lithium metal," said Liu Kai.

Cui Wei told reporters that this smart stimulus-responsive coating provides a new concept for the development of lithium batteries. (Reporter Jiang Jing)

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