Nickel-rich ternary cathode materials are considered to be one of the most ideal cathode materials for next-generation high-energy-density lithium ion power batteries due to their advantages of high reversible capacity and low cost. However, problems such as poor interfacial stability and secondary particle internal structure degradation have seriously hindered the large-scale application of this type of cathode material.
Recently, Li Lingjun, associate professor of Changsha University of Science and Technology, has collaborated with professors and teams at home and abroad such as Xiamen University Zhang Qiaobao, Argonne National Laboratory Lu Jun, University of Nebraska Lincoln, Brookhaven National Laboratory The work, guided by first-principles calculations, simultaneously synthesized titanium-doped, lanthanum nickel-lithium oxide coated "double modified" nickel-rich ternary cathode materials. This simple and efficient synthesis method is expected to greatly reduce the production threshold of high-performance nickel-rich ternary materials. The results were published in the international journal "Advanced Functional Materials".
The team started by analyzing the migration barriers of titanium and lanthanum on the surface of nickel-rich ternary materials, and found that the state in which titanium is incorporated into the bulk phase and lanthanum escapes to the surface is the lowest energy state in the system, which is the stable state. According to the theoretical calculation results, they reasonably designed and synthesized “double modified†nickel-rich ternary materials simultaneously. The material exhibits good thermal stability, structural stability and excellent electrochemical performance. After 150 cycles of high temperature at 60 degrees Celsius, the capacity retention rate of the double-modified material is nearly twice that of the pure phase nickel-rich material. After using full field transmission X-ray micro-imaging to visualize the cathode material before / after cycling, the team proved that "double modification" can inhibit the generation of micro-cracks in the secondary particles of the cathode material and the micro-crack propagation during cycling. The uneven distribution of Ni3 + between the secondary particles of the post-nickel-rich material is effectively suppressed, thereby significantly improving the structural stability of the secondary particles of the material.
This discovery provides new ideas and theoretical guidance for the development and application of nickel-rich ternary materials, and contributes to the development of high energy density lithium ion power batteries. (Reporter Yu Huiyou)
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