Changsha University of Science and Technology disclosed on the 14th that the team of associate professor Li Lingjun of the school's School of Materials Science and Engineering and assistant professor Zhang Qiaobao of Xiamen University, Lu Jun, professor of Argonne National Laboratory, University of Nebraska-Lincoln, Brookbrook Researchers and teams at home and abroad such as Wen National Laboratory synthesized high-energy lithium-ion battery double-modified cathode materials.
The research results were published in the latest issue of "Advanced Functional Materials" by Changsha University of Science and Technology as the first unit of the internationally important academic journal in the field of materials chemistry. The first author of the paper is Yang Huiping, a postgraduate student of Changsha University of Science and Technology. Author.
Lithium-ion batteries have many advantages such as high reversible capacity, high working potential, long cycle life, and small self-discharge. They have been widely used in various portable devices, and have been gradually promoted and applied in the field of energy storage and electric vehicles.
"Among commercial cathode materials, the layered structure of nickel-rich ternary materials has high energy density (single cell specific energy up to 280Whkg-1) and low cost, which is increasingly favored by the market. However, nickel-rich ternary cathodes The material still has problems such as poor interface stability and secondary particle internal structure decline, which seriously hinders its large-scale application. "Li Lingjun said.
To this end, the research team took the lithium-ion battery high-capacity nickel-rich cathode material as the research object. It took three years to analyze the migration barrier of titanium and lanthanum on the surface of the nickel-rich ternary material, and found that titanium is incorporated into the bulk phase and lanthanum is enriched. The state on the surface is the state where the system energy is the lowest, that is, the stable state. Based on the theoretical calculation results, they reasonably designed and simultaneously synthesized a double-modified nickel-rich ternary material doped with titanium and coated with lanthanum nickel lithium oxide.
Li Lingjun introduced that the material exhibited good thermal stability, structural stability and excellent electrochemical performance. "At 150 degrees Celsius and 150 cycles, the capacity retention rate of the double-modified material is nearly twice that of the pure phase nickel-rich material, which can effectively inhibit the nano-scale structural degradation of the nickel-rich material during cycling. This enhances the surface stability of nickel-rich materials. "
In addition, the research team used full-field transmission X-ray micro-imaging to visualize the cathode material before and after cycling, proving that double modification inhibited the generation of micro-cracks in the secondary particles of the cathode material and the micro-crack propagation during the cycle, and revealed After the circulation, the uneven distribution of Ni3 + between the secondary particles of the nickel-rich material is suppressed, and the structural stability of the secondary particles of the material is significantly improved.
The research was supported by several funds from the National Natural Science Foundation of China, the National Key R & D Project, the Changsha Outstanding Innovative Youth Training Program, and the US Department of Energy. (Wang Haohao Yu Ling)
Double Row Angular Contact Ball Bearing LFR Series
Double Row Angular Track Wheel Lr Series,Double Row Angular Track Wheel Lr Series Axial,Double Row Angular Track Wheel Lr Series Bearings,Double Row Angular Track Wheel Lr Series Fit
Ningbo DeNeu Imp. & Exp. Co., Ltd , https://www.deneucn.com