[Technical breakthrough] The new technology makes sulfide all-solid lithium ion
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2022/07/11 09:44:10
The advanced Energy Storage Materials and Technology research group, led by Prof. Jianfei Wu of Qingdao Institute of Bioenergy and Process, Chinese Academy of Sciences, has made a series of breakthroughs in basic scientific issues in the field of sulfide all-solid-state lithium ion battery and battery large-scale preparation technology. The results were published in the international journal Chemoelectrochemistry.
Sulfide all-solid lithium ion battery, with its advantages of high energy, fast charge and discharge, good low temperature performance, high safety and long life, has creatively solved a series of problems existing in liquid lithium battery, such as low energy density, inflammable, explosive and so on, and has become a revolutionary frontier technology. Sulfide solid electrolyte has many advantages, which make sulfide all-solid lithium battery have high energy density and high rate performance. Many automobile companies in the world have invested in sulfide all-solid lithium battery research and development, and released mass production plans.
Sulfide electrolyte is the key material of sulfide all-solid lithium ion battery. The increasing ionic conductivity of sulfide electrolytes at room temperature has been reported, comparable to that of organic electrolytes used in commercial lithium-ion batteries.
Over the years, the scientific research team is committed to the development of high-performance sulfide solid electrolyte, using high-throughput calculation method to develop sulfide solid electrolyte with high conductivity, its ionic conductivity at room temperature has reached the international level, the establishment of sulfide solid electrolyte pilot production line, with kilogram batch preparation capacity.
On this basis, the team has recently made key advances in the study of the air stability of sulphide electrolytes. Through double doping of soft acid and hard base, sulfide electrolyte materials with high ionic conductivity, electrochemical stability and air stability were obtained.
According to introducing, to break through the sulfide solid-state soft package of the preparation of lithium battery industrialization technology bottleneck, the scientific research team of independent innovation for a number of key technologies, such as the preparation of a thickness of less than 20 microns thin electrolyte film technology, to develop the high stability of the electrode coating technology, build the stability of the electrode/electrolyte interface technology, as well as the homogenate, coating, such as electrode forming technology, It also successfully developed flexible battery with excellent rate and low temperature performance, and took the lead in breaking through the technical difficulty of poor cycle life of all-solid flexible lithium battery. We have successfully developed an all-solid-state soft-pack lithium battery with a long cycle life, with 850 cycles and a capacity retention rate of 94%.
At present, the scientific research team has completed the laboratory technology manufacturing, established the laboratory production line of all-solid-state flexible package battery, explored the production mode of sulfide all-solid-state lithium ion battery, and laid a foundation for promoting the industrial production of high-performance, low-cost, high-capacity and high-safety sulfide all-solid-state flexible package battery.
Eastchem's main products: electron-grade N-methylpyrrolidone (NMP) and single-walled carbon nanotubes (SWCNT).
N-methyl pyrrolidone (NMP) belongs to nitrogen heterocyclic compound, is a non-toxic, high boiling point, strong polarity, low viscosity, small corrosion, large solubility, low volatility, good stability, easy recovery of highly selective solvent. It is a very important auxiliary material in the production of lithium ion battery, generally used as a positive electrode coating solvent, or as a lithium battery conductive slurry solvent.
Single walled carbon nanotubes (SWCNT) is a new conductive agent for lithium ion batteries. It can reduce the internal resistance of electrodes, improve the circulation at room temperature and high temperature, improve the energy density, and provide excellent conductivity for lithium ion batteries.
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