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mof-based single-atom lithium-replenishing composite material and preparation method thereof, positive electrode material and battery

A composite material, MOF technology, applied in the field of positive electrode materials and batteries, MOF-based single-atom lithium-supplemented composite materials and their preparation, can solve the problems of unfavorable direct use, high decomposition potential, poor conductivity, etc.

Active Publication Date: 2022-08-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium carbon oxides directly used as lithium supplements have poor conductivity and high decomposition potential, which is not conducive to direct use in positive electrodes.

Method used

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  • mof-based single-atom lithium-replenishing composite material and preparation method thereof, positive electrode material and battery
  • mof-based single-atom lithium-replenishing composite material and preparation method thereof, positive electrode material and battery
  • mof-based single-atom lithium-replenishing composite material and preparation method thereof, positive electrode material and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The present embodiment provides a preparation method of a MOF-based single-atom lithium-supplemented composite material, comprising the following steps:

[0036] S1, weigh 1.29g Zn(NO 3 ) 2 ·6H 2 O and 1.62 g of 2-methylimidazole (C 4 H 6 N 2 ), added to 100 mL of methanol, stirred until the solution was clear, and then continued to stir for 30 min. During this process, the solution gradually changed from a colorless clear solution to a white suspension. The obtained white precipitate was washed three times with methanol by centrifugal filtration, and kept in a vacuum oven at 120 °C for about 12 h. At this time, a white powder solid was obtained as ZIF-8, and its X-ray diffraction pattern (XRD) was as follows: figure 1 shown. At the same time, combining figure 2 It can be seen from the SEM results that the synthesized ZIF-8 material is a rhombic dodecahedron with a size of about 1 μm.

[0037] S2, weigh 10mg of MnCl 2 ·4H 2 O was dissolved in 50 mL of ethano...

Embodiment 2

[0045] This embodiment provides a preparation method of MOF-based single-atom lithium-supplemented composite material. The preparation method is basically the same as that of embodiment 1, and the difference is only that: in step S2, the impregnation raw material FeCl is used 3 ZIF-8-Fe is prepared, the target catalyst FeNC obtained in step S3 is denoted as A2, and the composite lithium supplement material prepared in step S4 is denoted as A2-1.

[0046] This embodiment also provides a method for preparing a positive electrode piece and a simulated battery, the steps of which are the same as those in Example 1, and the positive electrodes of the simulated battery are respectively recorded as E2-1 (without lithium cobalt oxide positive electrode material and Ketjen black) and S2 (Contains lithium cobalt oxide cathode material and Ketjen black).

Embodiment 3

[0048] This embodiment provides a preparation method of MOF-based single-atom lithium-supplemented composite material, and the preparation method is basically the same as that of embodiment 1, and the difference is only:

[0049] In step S2, the impregnation raw material CoCl is used 2 ZIF-8-Co is prepared, the target catalyst CoNC obtained in step S3 is denoted as A3, and the composite lithium supplement material prepared in step S4 is denoted as A3-1.

[0050] This embodiment also provides a method for preparing a positive electrode piece and a simulated battery, the steps of which are the same as those in Example 1, and the positive electrodes of the simulated battery are respectively recorded as E3-1 (without lithium cobalt oxide positive electrode material and Ketjen black) and S3 (Contains lithium cobalt oxide cathode material and Ketjen black).

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Abstract

The invention provides a MOF-based single-atom lithium-supplemented composite material, a preparation method thereof, a positive electrode material and a battery. The MOF-based single-atom lithium-replenishing composite material comprises a lithium salt and a carbonized derivative prepared by using MOF to impregnate a transition metal salt solution and then calcined and acid-etched. It is applied in a lithium-ion battery system and can reduce the cost of lithium-replenishing additives. The decomposition potential reduces the Coulombic efficiency of the first cycle.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a MOF-based single-atom lithium-replenishing composite material and a preparation method thereof, as well as a positive electrode material and a battery. Background technique [0002] Commercial lithium-ion batteries generally use carbon anode materials, but the capacity of carbon anode materials is generally low, and during the first cycle of discharge, a solid electrolyte membrane (SEI) containing lithium will be formed due to the reaction between the electrolyte and the anode interface, which makes it charge and discharge. There is some irreversible capacity loss during cycling. [0003] In order to solve the problem of the initial Coulombic efficiency, the researchers proposed a technical solution for lithium supplementation of the positive electrode and lithium supplementation of the negative electrode. In the above-mentioned lithium replenishment technology, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M4/62H01M4/13H01M4/139H01M10/0525
CPCH01M10/4235H01M4/62H01M4/13H01M4/139H01M10/0525H01M2004/028Y02P70/50
Inventor 谢佳李思吾张薇钟伟
Owner HUAZHONG UNIV OF SCI & TECH
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