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Aluminum ion battery and positive electrode material CoxSy@MXene thereof

A technology of aluminum ion battery and positive electrode material, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of low battery cycle performance, unreported, lack of electrode structure, etc., to improve cycle stability and structural stability. , the effect of increasing the specific capacity

Inactive Publication Date: 2021-04-02
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of a reasonable electrode structure, the battery cycle performance is not high
[0004] So far, no patent has been reported on the use of MXene in situ synthesis of micro-nano cobalt sulfide as the positive electrode of aluminum-ion batteries

Method used

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  • Aluminum ion battery and positive electrode material CoxSy@MXene thereof
  • Aluminum ion battery and positive electrode material CoxSy@MXene thereof
  • Aluminum ion battery and positive electrode material CoxSy@MXene thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] 25 ml of hydrochloric acid with a concentration of 7.5 mol / L, 4.68 g of lithium fluoride and 15 ml of distilled water were configured to make a total of 40 ml of mixed solution A. Add 1 g of MAX(Ti 3 AlC 2 ) Pour the raw materials into the mixed solution A and stir (300 r / min), etch in a water bath at 35 °C for 48 h; after completion, perform centrifugal cleaning (4000 r / min) until the pH of the washing solution is > 6 (does not affect battery performance). Fill with argon for 1 min (to prevent oxidation), and ultrasonically disperse for 1 h. Pour out the suspension, and centrifuge (2000 r / min) for 10 min to obtain the MXene dispersion, which is stored in the refrigerator.

[0028] Add 0.49815 g of cobalt acetate tetrahydrate and 0.3162 g of anhydrous sodium thiosulfate into 40 ml of distilled water, mix well to obtain a mixed solution B, then add 40 ml of MXene dispersion to the mixed solution B, and stir evenly. The mixture was subjected to a hydrothermal reaction ...

Embodiment approach 2

[0032] The difference between this embodiment and embodiment 1 is:

[0033] (1) When preparing mixed solution A, concentrated hydrofluoric acid with a mass fraction of 50% was used.

[0034] (2) When making the positive electrode material, pour cobalt acetate tetrahydrate and anhydrous sodium thiosulfate into 30 ml of distilled water.

[0035] The cathode material prepared in this way is Co x S y @MXene. Its SEM picture is as follows image 3 As shown, it can be seen that Co x S y On the whole, it is evenly and finely distributed on the sheet. And carry out charge and discharge test and battery cycle performance test on the aluminum ion battery prepared by this embodiment, the test results are as follows: Figure 4 , it can be seen that the aluminum ion battery made of this positive electrode material has excellent charge-discharge specific capacity, excellent cycle performance, obvious charge-discharge platform and stable charge-discharge efficiency.

[0036] The rest...

Embodiment approach 3

[0038] The difference between this embodiment and embodiment 1 is:

[0039] (1) When making the positive electrode material, pour cobalt acetate tetrahydrate and anhydrous sodium thiosulfate into 20 ml of distilled water.

[0040] (2) The positive electrode material, PTFE and conductive carbon are mixed in absolute ethanol at a mass ratio of 7:2:1.

[0041] The cathode material prepared in this way is Co x S y @MXene. Its SEM picture is as follows Figure 5 As shown, it can be seen that Co x S y Grown on sheets of MXene, the particle size is nanoscale. And carry out charge and discharge test and battery cycle performance test on the aluminum ion battery prepared by this embodiment, the test results are as follows: Figure 6 , The discharge specific capacity of the aluminum ion battery made of this positive electrode material gradually increases, and it has a stable charge and discharge efficiency.

[0042] The rest are exactly the same as those in Embodiment 1, and wil...

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Abstract

The invention relates to the technical field of energy storage batteries, and discloses an aluminum ion battery and a positive electrode material CoxSy@MXene thereof. The positive electrode material is prepared by in-situ growth of micro-nano cobalt sulfide on an MXene matrix material, the micro-nano cobalt sulfide is CoxSy, x is greater than 0, y is greater than 0, and the mass of the micro-nanocobalt sulfide accounts for 5%-95% of the total mass of the positive electrode material. The positive electrode material is characterized in that: the nano micro-nano cobalt sulfide directly grows onthe MXene matrix material in situ, so that the dispersity of the nano micro-nano cobalt sulfide is improved, crystal grains are refined, the conductivity can be effectively improved, and the actual capacity of the micro-nano cobalt sulfide is fully exerted; and the synergistic effect of the MXene matrix and the micro-nano cobalt sulfide is exerted, and the specific capacity and the cycling stability of the aluminum ion battery are improved. The aluminum ion battery taking the material as the positive electrode has the advantages of low price, stable circulation, wide voltage window, cleanness,environmental protection, high safety and the like, and can be applied to the fields of electronic industry, communication industry, energy reserve and the like.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, in particular to an aluminum ion battery and its positive electrode material Co x S y @MXene. Background technique [0002] In recent years, with the gradual depletion of traditional energy sources and the increasingly serious environmental problems, the new energy industry has received more and more attention. Among them, lithium-ion batteries are developing rapidly in electrochemical energy storage, but their safety issues, lithium resource reserves, and high costs limit their development. [0003] Rechargeable aluminum-ion batteries (AIBs) can be used as a new generation of large-scale energy storage devices due to their abundant aluminum source, high specific capacity and high energy density second only to lithium batteries. However, AIBs lack suitable cathode materials with the required capacity and long-term stability, which severely limits the practical applications of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCH01M4/5815H01M4/625H01M10/054H01M2004/028Y02E60/10
Inventor 张倩倩刘钟升温合静苗果杨建红乔佳
Owner JIANGSU UNIV
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