High energy density organic flow battery breakthrough

Recently, low-carbon clean energy research institute of Beijing gao cooperation with tsinghua university to develop organic liquid flow energy storage battery. The results of the study in terms of raising organic liquid flow energy storage battery energy density to achieve a breakthrough, the advantage of its high energy density and high reactivity, make it has a broad application prospect in the field of large-scale energy storage. Research results published in academic journals on February 11, the American chemical society ACS Applied Energy, Materials, and as a magazine cover key reports.

in recent years, with the widely application of the energy storage system, battery storage technology is also in the corresponding development, the reporter understands, at present can realize large-scale energy storage battery system showed a trend of diversification, including lithium battery energy storage system, solid-state batteries and all vanadium flow batteries, etc. Among them, the flow battery for its higher security, in competition with the traditional lithium-ion batteries. Flow battery electrolyte in the working status is in constant loop, so you don't heat partial expansion leads to the battery overheat, greatly improved its security. But with aqueous solution as the electrolyte flow battery is facing the problem of the low energy density, the volume of the energy storage system is often larger, practical application is limited by the accordingly. Under this background, the organic flow battery is overcome these two problems.

according to introducing, the fluid flow battery open circuit voltage are significantly higher than the traditional flow battery. The battery at the same time, the fluid flow theory of the energy density of 223 watt/l, is the traditional flow theory of battery energy density ( 50 hours/l) More than four times. Experiments show that the active flow battery the poles of the active material has excellent electrochemical performance and good cycle stability, current efficiency reached 95%, the energy efficiency reached 70%. The paper's lead author, low-carbon clean energy research institute of Beijing new energy research technology center, postdoctoral XingXueQi said a flow battery cathode materials are organic compounds, not only get rid of the traditional metal reserves in electrolyte lower limit, preparation is relatively simple, can realize large-scale production. “ The organic flow battery open circuit voltage and energy density were significantly higher than that of traditional system of the vanadium, can in the limited space to store more energy, in addition to can be applied to traditional stationary energy storage, the future is expected to be applied to mobile storage and electric vehicles. ” XingXueQi said.

it is worth mentioning that the organic flow battery diaphragm, electrode and electrolyte can realize recycling, there is no problem of traditional electrolyte scrapped after the heavy metal pollution. XingXueQi said: & other; The organic flow battery electrolyte can organic solvent by reduced pressure distillation separation, first of continue to reuse after purification, the rest of the electrolyte can be further operation for solid-liquid separation, will be the support of the solid electrolyte and separation of active component of the liquid, then after purification process can be repeated use. ”

the other according to the project director Dr Qing-hua liu, after three years of efforts, dominated by low carbon courtyard of the high power density of the whole development of vanadium flow batteries have finished test in laboratory and the preliminary pilot, is preparing for further testing and technology demonstration work, main application scenarios include user side energy storage, peak off-grid power supply and cutting, etc. , of the specific projects will be launched in 2020.