Recently, China has developed a high-capacity, fast charging electrochromic battery. In this type of battery, tungsten oxide (WO2.72, i.e. violet tungsten oxide) nano-wires are taken as a positive electrode, and the metal aluminum is as the negative electrode; compared with other batteries, this kind of cell has some new advantages in the following aspects:
1. It establishes a capacity to identify of interface with the users through color changing, which the specific performance is: the transparent state on behalf of the full status of the battery; when it gradually turns to blue, it means the storage power starts to consume; and when the color reaches the deepest, it says the power is depleted;
2. By adding a trace amount of hydrogen peroxide, it can realize fast charging (full charged within 8s), besides, the traditional external power supply can be used for charging, and also the oxygen in the air can be used to achieve self-charging;
3. The battery capacity is six times (or more) higher than the similar battery.
Electrochromic refers to the optical properties of the material (reflectance, transmittance, absorption rate, etc.) occurs stable and reversible of the phenomenon of color changing under the applied electric field, and it appears in the reversible changing of color and transparency. Electrochromic material is divided into non-organic electrochromic material and organic electrochromic material, wherein the typical non-organic electrochromic material is tungsten trioxide. Violet tungsten oxide is a kind of functional nano material with many properties, such as photochromic,
electrochromic and gasochromic, it has broad applications in a variety of sensitive element; at the same time, it is one kind of better and more economical method for preparing nanoscale and ultrafine tungsten powder. The violet tungsten oxide usually comes from the raw material of ammonium paratungstate, to generate by controlling the specific reaction conditions.
We all know that the battery capacity is one of the important performance indicators of the battery, with the increasing of the capacity of the battery, the charging time will also be doubled. Of course, in the face of "black technology", this is not a problem, with the rise of all kinds of fast charge technology, the charging time is considerably reduced. The electrochromic battery invented by China, which uses tungsten oxide as a positive electrode, has opened up a new path for the future development of battery.