Lithium - Liquid Polysulfide Flow Cell For 'regeneration'

- Sep 15, 2017-

Lithium - liquid polysulfide mobile battery is theoretically suitable for large-scale energy storage of power grids. However, this kind of battery can be easily reduced in the circulation process and cannot be truly applied.For years, professor cui yi of Stanford university in the United States has found a "regenerative" technique to restore capacitance, promising to solve the problem of large-scale energy storage.

Research published in the journal nature communications, according to the paper with metallic lithium as negative, with more liquid sulfur as the anode of lithium - more than liquid sulfur flow battery, high energy density, low cost of energy storage as well as the advantages of mobile, however, in the process of charging and discharging the liquid sulfur into a more solid sulfur precipitation, forming "dead more sulfur fragments", results in the decrease of battery capacity in the process of circulation, large-scale energy storage can't really applied in the power grid.The study could "bring back the dead" of the polysulfide debris.

Researchers told the journal of science and technology, the so-called "regenerative", is to add sulfur powder and "dead sulfur pieces" in the case of heating mixing issued by biochemical reaction, liquid solid more low sulfur can be converted to higher order more sulfur, to restore the capacity of the battery loss.In the actual lithium - liquid polysulfide flow system, a "regeneration" can be carried out every once in a while, which can keep the whole system running steadily and have high energy density.The team built a lithium - liquid polysulfur-liquid energy storage system for circulating tests.The sulfur load used in a single battery has a high dack level, which is much higher than the average test battery, and can be run steadily.

Because of its high energy density, low cost of energy storage and security features, lithium - liquid level in the power system of future more sulfur battery storage system has a good application prospect in the size of the energy storage, and is expected to reduce storage cost reduced to less than $100 per KWH.