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New clothes for Lithium-ion electrode, and battery performance is greatly improved
2018-07-20
来源：转载自第三方
20 July 2018
Recently, Dr. Zhao Jinping, Ph.D., of the Institute of Metal Research of the Chinese Academy of Sciences and the chief scientist of Beijing Shengmeng Technology Co., Ltd., demonstrated to the industry experts in the Beijing Science and Technology Hall the technology of graphene-encapsulated positive and negative materials for lithium-ion batteries, which can greatly enhance the performance of lithium ion battery per.
Graphene is a planar film in which a hexagonal honeycomb crystal lattice composed of sp2 hybrid orbitals is formed. Its thickness is one hundred thousandth of the hair, the strength is 200 times that of steel, the thermal conductivity is up to 5300W/m•K, and the electron mobility at room temperature exceeds 15,000cm2/V•s, which is the thinnest, hardest and conductive material in the world. Since its discovery in 2004, especially since its discoverers have won the 2010 Nobel Prize in Physics, graphene has become a dazzling "star".
In the process of charge and discharge cycles, the conventional electrode material is prone to increase bulging, and in severe cases, it may cause pulverization, which greatly affects battery performance. Graphene has ultra-high conductivity and flexibility, and it is coated on the surface of the electrode material, which can enhance the electron transfer rate, improve the conductivity, and restrain the volume change, and greatly improve the discharge capacity, charge and discharge times and other properties. The team of Zhao Jinping developed a "two-phase interface coating method" and a "liquid nitrogen cold extraction method" for the positive electrode material and the negative electrode material, which solved the problem of graphene coating of lithium ion positive electrode material and negative electrode material, and produced a new type of lithium ion electrode material, realized the technological breakthrough of graphene coated electrode materials in the world.
After testing, the graphene coating technology can increase the specific capacity of the lithium ion battery cathode material by 15%~25%, increase the capacity retention rate after cycling 1000 times by 30%~40%, and increase the capacity of the anode material by 40%~45%, the capacity retention rate after 1000 cycles is increased by 35%~50%. After careful review, the expert committee believes that the application of graphene-coated lithium ion positive and negative materials technology to vehicle power batteries is expected to increase the energy density of ternary lithium-ion battery cells to 300Wh/kg， achieve the 2020 energy density indicator for vehicle power batteries proposed by the Smart Vehicle Key Technology Industrialization Implementation Plan.
At present, Zhao Jinping's team has applied for 2 national patents based on graphene wrapping technology, and several patents are being filed. The vehicle power battery is an important field for the application of graphene-coated modified lithium ion electrode materials. The industrialization of this technology will further push China into the era of electric vehicles. The technology has been successfully put into trial production on a large scale, laying the foundation for commercial mass production.
Edited by Suzhou Yacoo Science Co., Ltd.
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