American researchers recently reported in the American Chemical Society·Energy Communication magazine that they have developed a new type of flow battery that can store electric energy by dissolving organic molecules in neutral pH water. This result has made it possible to make batteries that are non-toxic, non-corrosive and have a long service life, and is expected to significantly reduce production costs.
The power storage system of the flow battery generally includes two positive and negative liquid storage tanks, and two different electrolytes are built in. The connection between these parts is the power generation area, separated by a diaphragm. The two electrolytes produce ion exchange across the membrane to achieve electrical energy storage and release.
The flow battery can provide a solution for the storage of renewable energy such as wind power, solar energy, etc., which has discontinuous power generation and unstable output. However, the current flow battery will have a decrease in storage capacity after repeated charge and discharge cycles, and it is necessary to regularly maintain the electrolyte. .
Researchers at Harvard University have developed a battery that loses only 1% storage capacity per 1000 charge/discharge cycles by adjusting the molecular structure of the positive and negative electrode electrolytes, respectively. Lithium ion batteries are generally 1,000. After the charge and discharge can not be used.
Neutral pH can also significantly reduce the manufacturing cost of the separator separating the positive and negative poles of the battery. Because most current flow battery separators use expensive polymers to withstand the corrosive substances in the battery, the cost accounts for one-third of the cost of the entire battery equipment. The diaphragms in the new flow battery are actually only on both sides of the diaphragm, so its material can be made of inexpensive hydrocarbons, which greatly reduces the cost.
Reducing costs is critical for power storage, especially for new energy such as wind and solar power. Emre Juke, director of energy storage research at the U.S. Department of Energy's power office, believes that this study is expected to point the way for future batteries and become a standard component of the grid infrastructure. (Reporter Hu Dandan)
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