Study on anode materials for lithium batteries -Lithium - Ion Battery Equipment

Research Progress in Negative Electrode Materials for Lithium Batteries -Lithium - Ion Battery Equipment

Lu Anhui, a professor of Dalian University of Technology, recently innovatively proposed that the metal organic skeleton zif-8 was prepared by in-situ growth of nano binary metal oxide (znsno3) as precursor using solvent-free method sn@c compound material. According to the theory of soft and hard acids and bases, 2-methylimidazole, as the boundary base, preferentially combines with the boundary acid zn2+to generate zif-8. The subsequent pyrolysis process makes zif-8 transform into a conductive carbon network containing nitrogen. The carbon of znsno3 is thermally reduced to nano tin particles and simple zinc. The dynamic volatilization of simple zinc at high temperatures due to its low melting point creates rich pores, which is conducive to the transmission of ions and electrons.

In recent years, the preparation of lithium ion battery electrode materials with high energy density and high power density is a research hotspot. Because of its high specific capacity, tin based materials are considered to be a potential alternative to traditional graphite anode materials. However, the serious volume expansion during charging and discharging leads to electrode pulverization and particle agglomeration, which leads to rapid capacity attenuation and low conductivity. Developing effective preparation methods of electrode materials and improving the conductivity of composite electrode materials are the key to improve the electrochemical performance of tin cathode.(Lithium - Ion Battery Equipment)

The new synthesis method ensures the high dispersion of tin nanoparticles in the composite. The developed pore structure and high nitrogen content can effectively alleviate the volume expansion during lithium insertion and improve the conductivity. The battery performance test results show that the prepared sn@c The first discharge capacity of the composite is 1321 mahg-1, and the first coulomb efficiency is 80.1%. After 150 cycles, the volume remained 901 mahg-1. In addition, this synthesis method can be extended to other materials, which also exhibit excellent electrochemical properties.



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