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According to the latest news, American scientists have recently overcome the main obstacle currently faced by lithium-sulfur batteries - the electrolyte dissolution problem, solving the problem of rapid failure of lithium-sulfur batteries. This technological breakthrough is expected to greatly enhance the market competitiveness of lithium-sulfur batteries. Currently, the main international chemical energy storage technologies include sodium-sulfur batteries, lithium batteries, flow batteries, lead-acid batteries, lithium iron phosphate batteries, etc. The editor will tell you today.
OFweek lithium power grid comprehensive report: Currently, the main international chemical energy storage technologies include sodium-sulfur batteries, lithium batteries, flow batteries, lead-acid batteries, lithium iron phosphate batteries, etc. A researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, said that with the development of the renewable energy industry and the electric vehicle industry, energy storage technology and industry have received great attention from various countries, and the research and development of various new electrochemical energy storage battery technologies have continued to make progress. Among them, the more representative ones include flow batteries, lithium-sulfur batteries, and lithium-air batteries, but their technological development faces some practical challenges.
Flow battery energy storage technology
Flow batteries are generally electrochemical energy storage devices that realize the mutual conversion of electrical energy and chemical energy through the redox reaction of liquid active materials, thereby realizing the storage and release of electrical energy. Because of its outstanding advantages such as independent power and capacity, deep charging and discharging, and good safety, it has become one of the best choices in the field of energy storage.
Since the invention of the flow battery in the 1970s, it has gone from laboratory to enterprise, from prototype to standard product, from demonstration application to commercial promotion, from small to large scale, from single function to comprehensive function. Various projects implemented include There are more than 100 projects, with a cumulative installed capacity of approximately 40 MW.
The all-vanadium flow battery has an installed capacity of 35 MW and is currently the most widely used flow battery. by
Through structural optimization and the application of new materials, the rated operating current density of the all-vanadium redox flow battery stack has been increased from the original 80mA/c㎡ to 120mA/c㎡ while maintaining the same performance. The cost of the stack has dropped significantly by nearly 30%. The bulk stack specification reaches 32 kilowatts and has been exported to the United States and Germany. In May 2013, the world's largest 5 MW/10 MWh all-vanadium redox flow battery energy storage system designed and constructed was successfully connected to the grid and put into operation at the Guodian Longyuan Woniushi 50 MW wind farm. Since then, the 3 MW/6 MWh energy storage project for wind power grid connection in Jinzhou and the 2 MW/4 MWh energy storage project of Guodian Hefeng have been implemented successively. They are also important cases in my country's exploration of energy storage business models.
Another leading company in the field of all-vanadium flow batteries is Sumitomo Electric of Japan. The company restarted its flow battery business in 2010 and will build a 15 MW/60 MWh all-vanadium flow battery power station in 2015 to solve the peak shaving and electric energy problems caused by the connection of large-scale solar power stations to the grid in some areas of Hokkaido. Quality pressure, the successful implementation of this project will be another milestone in the field of all-vanadium flow batteries. In 2014, the US company UniEnergy Technologies, LLC (UET) established a 3MW/10MWh all-vanadium redox flow battery energy storage system with the support of the US Department of Energy and the Washington Clean Fund. In this project, UET will apply its mixed acid electrolyte technology for the first time to increase energy density by about 40%, widen the operating temperature window and voltage range of all-vanadium redox flow batteries, and reduce thermal management energy consumption.
At present, improving the energy efficiency and system reliability of flow batteries and reducing their costs are important issues for the large-scale popularization and application of flow batteries. Developing high-performance battery materials, optimizing battery structure design, and reducing battery internal resistance are key technologies. Recently, Zhang Huamin and his research team have improved the charge and discharge energy efficiency of an all-vanadium redox flow battery cell from 81% a few years ago to 93% at an operating current density of 80mA//c㎡ through battery material innovation and structural innovation. %, fully proving that it has broad development space and prospects.
Lithium-Sulfur Battery Technology
In recent years, traditional lithium-ion battery technology has continued to improve, but the specific energy of the battery still cannot meet the application requirements. Battery technology is still the biggest bottleneck in the development of portable electronic devices and electric vehicles. In order to achieve innovative breakthroughs in high-energy-density battery technology, researchers have chosen metal-air batteries such as lithium-sulfur batteries and lithium-air batteries with higher energy density as breakthrough directions, and have made certain progress. Some new battery technologies are already seeing the light of day in practical applications.
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