Conductive composite material, preparation method and application of conductive composite material

Abstract

The invention relates to a conductive composite material, a preparation method and application of the conductive composite material. The conductive composite material is a composite material with a NiCoO2 / graphene / NiCoO2 sandwich structure which is at least prepared from graphene oxide, Co(NO3)2.6H2O, Ni(NO3)2.6H2O and hexamethylenetetramine. The layered ultrathin mesoporous NiCoO2 / graphene / NiCoO2sandwich structure composite material still has the specific capacity of 595 mAh / g after the circulation of 350 circles at 1A / g, and the specific capacity of the material is 1.6 times of the theoretical specific capacity of a carbon material; and therefore, a battery prepared from the composite negative electrode material has higher specific capacity than a battery prepared from a current commercial carbon negative electrode material, and the volume specific capacity and volume energy density of the battery are far higher than those of the battery prepared from the carbon negative electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a conductive composite material, a preparation method and its application in negative electrode materials of lithium ion batteries. Background technique [0002] In recent years, with the widespread popularization of various portable electronic products such as mobile communication products, notebook computers, and digital cameras, as well as the commercial development of a new generation of electric vehicles and hybrid electric vehicles, the demand for high-capacity secondary batteries is increasing day by day. In order to meet the needs of environmental protection, people are more and more committed to the development of new energy sources in order to replace traditional energy sources such as coal and oil. Therefore, green energy sources such as new high-performance lithium-ion secondary batteries, wind energy, solar energy, and geothermal energy have developed r...

AI Technical Summary

Problems solved by technology

Due to the high electrical conductivity of graphite-based carbon materials, the structure is stable and the cycle stability is good during the deintercalation process, and the lithium intercalation and deintercalation potential is low, and the carbon materials are relatively cheap, but their theoretical capacity is low, only 372mAh / g, which cannot Meet the growing demand for high-capacity, high-energy-density lithium-ion batteries

[0003] At present, new materials such as silicon, tin, and transition metal oxides are regarded as potential substitutes for graphite anode materials, but they have large volume changes during lithium intercalation and delithiation, and have low electronic conductivity, resulting in low The disadvantages of irreversible capacity and poor cycle stability limit the practical application of these new materials.

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