According to a recent article in the Pacific Northwest National Laboratory (PNNL), a lithium-sulfur battery can have a basic cycle life of up to 400 cycles with a hybrid electrode made of graphite and lithium, which in turn increases the mileage of electric vehicles.

Although the cycle life of 400 cycles is not outstanding, the energy density of lithium-sulfur batteries is 2-3 times higher than that of ordinary lithium batteries. The biggest problem that restricts the development of such batteries is that during the battery reaction process, the sulfur sulfide flow is shortened. The cycle life of the battery.

The article author Liu Jun said that in order to overcome this problem, most of the research so far has been devoted to preventing sulfide leakage. However, researchers at PNNL believe that it is difficult to prevent leakage and have obvious side effects, so they chose to add a protective film on the outside of the electrode, that is, a mixed electrode made of graphite and lithium.

This hybrid electrode can increase the cycle life of lithium-sulfur batteries by a factor of four. With a common electrode test, the lithium-sulfur battery cycle life is only 100 times, while the use of hybrid electrodes, cycle life increased to 400 times. Liu Jun said that although the sulphide will still flow out, it does not affect the battery life. In the experiment, the energy density of the lithium-sulfur battery also only attenuated by 11%. (Compiled by Li Yuanyuan)

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