Preparation method of nano Ni-MOF / CNT catalyst for lithium oxygen battery

By using nanocomposite materials of Ni-BDC-MOF and hydroxylated carbon nanotubes in lithium oxygen battery catalysts, the problem of insufficient catalyst stability is solved, rapid kinetics and long cycle performance are achieved, and the overall performance of the battery is improved.

CN119695178APending Publication Date: 2025-03-25BEIJING NORMAL UNIVERSITY
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Patent Information

Application Number
CN202411865216.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-18
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The lack of stability of existing lithium-oxygen battery catalyst materials leads to reduced battery cycle stability, increased overpotential and frequent side reactions, affecting the safety and performance of the battery.

Method used

A simple strategy is used to prepare nanocomposite materials composed of Ni-BDC-MOF-embedded hydroxylated carbon nanotubes. The degree and size of CNTs are optimized through mechanical ball milling, acid-base treatment and other steps to form a fast electronic path, and improve the stability and durability of the catalyst.

Benefits of technology

The rapid kinetics and excellent cycle performance of lithium oxygen battery catalyst are achieved, and the long cycle performance of 800 times can be achieved at a current density of 500mA g-1, improving the overall performance and stability of the battery.

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Abstract

The invention relates to a preparation method of a nano Ni-MOF / CNT catalyst for a lithium oxygen battery, which comprises the following steps: firstly, mixing a multi-walled carbon nanotube (CNT) with a reducing agent and alkali, then carrying out mechanical ball milling, and then sequentially carrying out acid treatment and alkali treatment, so that the obtained CNT has the best binding capacity to Ni-BDC-MOF, and the catalytic activity and stability are obviously improved. The Ni-BDC-MOF / CNT composite material prepared by the preparation method disclosed by the invention is used for a catalyst for a positive electrode of a lithium-oxygen battery, has excellent electrochemical performance, obviously improves the catalytic activity and stability of the catalyst, shows rapid oxidation-reduction reaction kinetics and excellent cycle performance, has high specific discharge capacity and low overpotential, and can be applied to the preparation of lithium-oxygen batteries. And the excellent cycle performance of 800 cycles under the current density of 500mA g <-1 > is realized.
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