A new 3D battery has a huge capacity and is charged in a split second

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<pre>A new 3D battery has a huge capacity and is charged in a split second

Engineers from the University of Cornell have developed a new structure for a typical household battery. From the classical scheme, with a spaced cathode and anode, they moved to a complex three-dimensional architecture, where the electrodes are hyperfine and constantly intertwined. But they do not intersect – this achieves a tremendous increase in power density and battery charging rate while maintaining the same dimensions.

The internal structure of a 3D battery is described by the term “gyroide” – a continuous, infinitely twisting in three dimensions, but with nowhere intersecting structure . It is made of a carbon film several nanometers thick, which is close to graphene, but it is not. A 10-nm layer of dielectric is applied to the carbon anode, over which a film of the sulfur cathode is located. And all this is flooded with electroconductive polymer PEDOT.

The intricacies of a gyrode form a huge number of microcells with a diameter of about 40 nm, each of which can be regarded as a tiny battery. All of them are very tightly packed to minimize voids inside the battery, which leads to a reduction in time and energy loss during the passage of electrons during charging / discharging. The power density of the battery increases, and the charging speed drops to a few seconds or even fractions of a second.

The lack of a 3D battery in irreversible wear, since when the sulfur cathode expands due to pressure on the polymer layer, small fragments break away from it. Over time, this will lead to loss of contact and some areas inside the battery will be in isolation. This can be called degradation of the battery and the research team is currently working on its solution.

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