Electrochromism/energy storage dual-function device and application thereof

Abstract

The invention discloses an electrochromism / energy storage dual-function device and application thereof. According to the electrochromism / energy storage dual-function device, metal zinc is used as a negative electrode, and a prussian blue electrochromic film attached to a conductive substrate is used as a positive electrode; a gap between the positive electrode and the negative electrode is filledwith dual ion electrolyte containing Zn<2+> and K<+>. The electrochromism / energy storage dual-function device has both an electrochromic function and a power storage capacity similar to a battery. Compared with a known scheme, the device has the advantages of being high in output voltage, high in energy density, high in discoloration speed, large in discoloration range, long in cycle life, cheap in raw materials, simple in preparation process, non-toxic and pollution-free and the like.

Description

technical field [0001] The invention belongs to the field of functional materials and devices, in particular to an electrochromic / energy storage dual-function device and its application. Background technique [0002] With the deepening of urbanization, the temporal and spatial distribution of building heating and cooling energy consumption is becoming more and more concentrated. It caused severe smog in the north; and severe power shortages in summer. Therefore, energy-saving buildings are paid more and more attention by people. [0003] The ultimate influencing factor of building thermal environment is the intensity of sunlight. Reasonable adjustment of building solar heat gain is particularly important for building energy saving. Electrochromic glass can respond to external electric field stimulation to produce reversible optical property changes, and then present different transparent states and reflection characteristics. Due to the adjustable optical performance, ele...

AI Technical Summary

Problems solved by technology

However, due to the dense aluminum oxide passivation layer on the surface of metal aluminum, a large polarization voltage (about 0.6 V, the difference between charge and discharge voltage) appears when the device is charging and discharging, which is not conducive to the high power of the device. use

More importantly, the electrochemical dissolution-deposition reaction of the aluminum negative electrode in the aqueous electrolyte used is irreversible. After a long cycle, the aluminum foil is completely consumed, and the device appears after about 50 charge-discharge / coloring-fading cycles. Significant performance attenuation severely limits the performance improvement of this type of device

Using aluminum ions as the intercalated ions in the color-changing layer of the positive electrode can improve the structural stability of the positive electrode, but this electrolyte is very acidic and will severely corrode the zinc negative electrode, and the cycle life of the device is still less than 200 times (Joule 2019, 3, 2268.)

Images