Graphene Alkaline Lithium Ion Capacitors Developed by Qingdao Energy

As the energy crisis and environmental issues become more and more serious, the society is very much looking forward to the promotion of the near-zero carbon emission area based on the energy Internet, which places higher demands on distributed energy storage technologies. At the same time, there are also urgent demands for electrochemical energy storage devices with high energy density and high power density in the fields of new energy electric vehicles and high-speed rail/urban rail transportation braking energy recovery.

The lithium ion capacitor is an electrochemical energy storage device that combines the high power characteristics and high energy density of a double layer super capacitor, and has a very good prospect of development. Therefore, the Ministry of Industry and Information Technology of the People's Republic of China, "Made in China 2025", lists high-energy density (greater than 20Wh/kg) power type capacitors as the key support areas. However, because related technologies are monopolized by foreign companies, domestic related companies have not yet mastered the core technologies. In recent years, the research team of the Qingdao Institute of Bioenergy and Process Technology of the Chinese Academy of Sciences Qingdao Energy Storage Industry Technology Research Institute has carried out a series of research and development work around the core electrode materials of high-energy-density lithium-ion capacitors and has successively explored the metal nitride material system (ACS). Appl. Mater. Interfaces, 2011, 3, 93), Nitrogen-doped graphene/metal nitride composite electrode materials (J. Mater. Chem., 2011, 21, 5430; 2012, 22, 24918; ACS Appl. Mater. Interfaces, 2012, 4, 658; J. Mater. Chem. A, 2013, 1, 5949; Part. Part. Syst. Char., 2015, 32, 1006), Graphene/Oxide Material Systems (ACS Appl. Mater Interfaces, 2012, 4, 658; Scripta Mater., 2013, 69, 171-174; J. Solid State Electrochem., 2013, 17, 1479-1485;), porous nitriding mesocarbon microspheres (Carbon, 2012, 50, 1355), ACS Appl. Mater. Interfaces, 2013, 5, 12340, Chem. Mater. 2015, 27, 2189) and Chem. Mater. 2015, 27 , 6668), and in-depth analysis of the lithium storage mechanism and interface effect of related materials (ChemPhysChem, 2010, 11, 3219; Coordin. Chem. Rev., 2013, 257, 1946), and finally determined the nitrogen-doped graphene composite route.

From the laboratory's original theoretical proofs, small-scale test breakthroughs to pilot-scale amplification, after many years of technical breakthroughs, the team has broken through the design and mass production of graphene composite electrodes, controllable and uniform pre-insertion of lithium, charge and discharge flatulence, and special collector pole pieces. Coating and other technical difficulties, in practice, summarized the preparation of graphite-based lithium-ion capacitor technology and technology, and self-reliant design and construction of the country's first lithium ion capacitor pilot production line, developed the highest capacity 3500F/4V lithium-ion capacitor Monomer, device energy density up to 55Wh/L (20.5Wh/kg), power density up to 5 kW/L, good cycle performance (over 10000 cycle capacity retention rate above 95%), low temperature performance is good (-30 degree capacity is More than 72% of room temperature lithium ion capacitors, related devices have passed the authority of the third party authority of the Suzhou Light Power Industry Ministry.

On December 22, the corresponding graphene-based high-energy lithium-ion capacitor technology passed the expert appraisal and evaluation organized by the China Petroleum and Chemical Industry Federation in Beijing. Experts of the appraisal committee listened carefully to the work report, research report, third-party test report, application report and new report, reviewed the relevant technical data, and passed the inquiry, defense and discussion, unanimously believed that the results were highly innovative and overall reached the international advanced level. The level has a good promotion value, and it is recommended that the process of industrialization be promoted as soon as possible to meet the needs of the country.

In addition, given that the energy storage device combines high power and high energy density with fast charging and fast release, it is very suitable as an “energy bucket” for energy internet technology. Qingdao Energy Storage Institute is using this energy bucket to build energy internet technology. A small near-zero carbon demonstration area. The key materials and core technologies surrounding the energy storage device have been granted 9 authorized invention patents and have independent intellectual property rights. It is worth noting that in early 2015, Qingdao Energy Storage Institute had already used the device to build a 48V system to demonstrate its application in the electric car power supply and other areas. Recently, Qingdao Energy Storage Institute is striving to apply this technology to the rail transit field as soon as possible.

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