Zirconium-based MOF material-based zirconium oxide-coated lithium ion battery ternary positive electrode material and preparation method thereof

Abstract

The invention discloses a zirconium-based MOF material-based zirconium oxide-coated lithium-rich ternary positive electrode material and a preparation method thereof. The method comprises the following steps: firstly, synthesizing a lithium ion battery ternary positive electrode material with a spherical structure by adopting a carbonate precipitation method; secondly, coating and growing a layerof zirconium-based MOF material with a large specific surface area and a high porosity on the surface of the lithium ion battery ternary positive electrode material, carrying out high-temperature sintering on the material, removing organic components in the zirconium-based MOF material, and forming a zirconium oxide coating layer with a large specific surface area and a high porosity. Compared thezirconium oxide coating layer with a common zirconium oxide particle coating layer, a small amount of porous carbon structures formed in the decomposition process of the MOF material form a bridgingeffect among zirconium oxide particles, and an electron transfer channel is formed. Therefore, the phenomenon that zirconium oxide does not have electrochemical activity to cause the gram volume lossof the material can be relieved. Meanwhile, the structure of the composite material can be stabilized, and side reactions between active substances and an electrolyte are effectively reduced. The cycle performance of the ternary positive electrode material of the lithium ion battery is effectively improved.

Description

technical field

[0001] The invention relates to the technical field of manufacturing ternary positive electrode materials for lithium ion batteries, in particular to a zirconium oxide-coated ternary positive electrode material for lithium ion batteries based on zirconium-based MOF materials and a preparation method thereof. Background technique

[0002] Li-ion batteries are widely used due to their advantages of high energy density, high voltage and long cycle life, and the commercialization of them in the automotive industry requires further improvements in energy density and safety, which is the key to meeting this challenge. The factor is the search for new high-capacity electrode materials, especially cathode materials. Currently used in practical applications are mainly layered lithium cobalt oxide series LiCoO 2 , layered lithium nickel oxide series LiNiO 2 and spinel-like lithium manganese oxide series LiMn 2 O 4 . However, the above systems all have significant ...

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