Three-dimensional conductive skeleton and preparation method and application thereof

Abstract

The invention discloses a three-dimensional conductive skeleton as well as a preparation method and application thereof, and the method comprises the following steps:(1) mixing a nitrogen source and asulfur source with an aqueous solution containing NaCO3 and NaHCO3 to obtain a conductive buffer solution; (2) soaking a three-dimensional conductive skeleton matrix in an organic solvent and concentrated acid in sequence; (3) assembling a three-electrode electrolytic tank by taking the three-dimensional conductive skeleton matrix obtained in the step(2) as a working electrode, Pt as a counter electrode, Ag/AgCl as a reference electrode and a conductive buffer solution as an electrolyte; and(4) applying a voltage to the working electrode in the step(3), and then carrying out heat treatment toobtain the three-dimensional conductive skeleton. By adopting the method, the three-dimensional conductive skeleton with good lithium affinity can be obtained, so that the lithium metal with higher content can be loaded, the contact resistance between the three-dimensional skeleton and the lithium metal is reduced, and the problem of uneven current density in the charging and discharging processis improved; and the lithium metal negative electrode prepared from the three-dimensional conductive skeleton obtained by the method is higher in specific capacity, better in lithium dendritic crystalinhibition effect and better in rate capability.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a three-dimensional conductive framework and a preparation method and application thereof. Background technique [0002] As the functions of electronic products in the consumer market are becoming more and more complete, and consumers have more and more requirements for the use time of electronic products. In the field of electric vehicles, short cruising range is still a major pain point that limits the popularity of electric vehicles. These market demands require batteries to develop towards high energy density. This trend requires the next generation of batteries to use higher capacity electrode materials. Among them, the transformation of the negative electrode material from graphite to lithium metal negative electrode can significantly improve the energy density of the power battery. [0003] Lithium (Li) metal has an ultra-high theoretical specific capacity (3860mAh ...

AI Technical Summary

Problems solved by technology

To this end, an object of the present invention is to propose a three-dimensional conductive framework and its preparation method and application. By using this method, a three-dimensional conductive framework with good lithium affinity can be obtained, so that a higher content of lithium metal can be loaded, and the three-dimensional framework can be reduced. The contact resistance with lithium metal can improve the problem of uneven current density during charging and discharging, and the lithium metal negative electrode prepared by using the three-dimensional conductive framework obtained by this method has higher specific capacity, better lithium dendrite inhibition effect, and better rate performance. good

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