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本文通过调节烧结温度设计构筑了一种纳米多面体颗粒堆积的中空球状Li Ni0.5Mn1.5O4材料,并进一步通过碳纳米管(CNT)的改性来提高材料的循环性能和高倍率性能.纳米中空结构不仅减少了锂离子的扩散路径,也保证了电解液和正极材料的充分接触,三维网状CNT的改性提高了材料的电子导电率,从而明显改善了材料的循环和高倍率性能.最终得到的LNMO-850/CNT材料在5 C的电流密度下初始容量为127 m A h g-1,500次循环后容量保持在104 m A h g-1.而在20 C的高电流密度下容量仍达到121 m A h g-1,体现了材料优异的循环和高倍率性能.
In this paper, a hollow spherical Li Ni0.5Mn1.5O4 nano-polyhedron material was designed by adjusting the sintering temperature, and the cycling performance and high-rate performance of the material were further improved by modifying the carbon nanotubes (CNTs) The structure not only reduces the diffusion path of the lithium ions but also ensures the sufficient contact between the electrolyte and the cathode material, and the modification of the three-dimensional network CNT improves the electron conductivity of the material and obviously improves material circulation and high rate performance. The resulting LNMO-850 / CNT material has an initial capacity of 127 m A h g-1 at a current density of 5 C and maintains a capacity of 104 m A h g-1 after 500 cycles. At high current densities of 20 C, Up to 121 m A h g-1, reflecting the excellent cycle and high rate performance of the material.