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A kind of nano-iron oxide composite material induced by mxene, preparation method and application thereof

A nano-iron oxide and composite material technology is applied in the field of nano-iron oxide composite material and preparation, and can solve the problems of volume expansion, reducing the effect of buffering the volume expansion of iron oxide, and different particle sizes of iron oxide particles.

Active Publication Date: 2021-11-16
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it also has its own deficiencies: (1) Poor electrical conductivity; (2) Volume expansion occurs in the process of deintercalating lithium, which affects the cycle performance of the battery
[0004] However, this method of physical modification has some unavoidable shortcomings. First, due to the difficulty of ensuring good uniformity by mechanical ultrasound, the particle size of iron oxide particles is different, which makes the occurrence of particles between particles during the subsequent mixing and pumping process. Secondly, the MXene of the sheet structure will also have the problem of stacking, causing some MXene to lose its role as a buffer template, unable to exert its excellent conductivity, and reduce the volume expansion of the buffer iron oxide in the process of deintercalating lithium. effect, which affects the electrochemical performance of the composite material

Method used

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  • A kind of nano-iron oxide composite material induced by mxene, preparation method and application thereof
  • A kind of nano-iron oxide composite material induced by mxene, preparation method and application thereof
  • A kind of nano-iron oxide composite material induced by mxene, preparation method and application thereof

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preparation example Construction

[0035] The invention provides a kind of preparation method of the nano iron oxide composite material that MXene induces growth, comprises the following steps:

[0036] A) will Ti 3 AlC 2 Adding to HF solution for etching to obtain an etching product;

[0037] B) mixing the etching product with tetramethylammonium hydroxide solution for intercalation, and then adding LiOH for reaction to obtain an intermediate product;

[0038] The mass ratio of the LiOH to the etching product is (0.04-0.09):1;

[0039] C) dispersing the intermediate product in water, ultrasonicating for 1 to 1.5 hours and then centrifuging, the obtained supernatant is MXene solution;

[0040] D) sequentially adding iron salt solution and lye to the MXene solution to perform in-situ growth to obtain a nano-iron oxide composite material;

[0041] The iron salt solution includes iron salt and dispersant.

[0042] In the present invention, it is preferred to stir the solution in the solution for sufficient et...

Embodiment 1

[0063] (1) Preparation of MXene solution with small flakes and -OH functional group content of 50%

[0064] Weigh 10g Ti 3 AlC 2 (MAX) powder was slowly added to 100 mL of HF solution with a mass fraction of 40%, and stirred continuously for 24 h at 50°C. Then, the fully etched solid product was washed with deionized water for 3 to 5 times, and then placed in an oven at 60° C. for vacuum drying for 12 hours to obtain a powder product.

[0065] Weigh 1 g of the above powder, add 25 mL of tetramethylammonium hydroxide (TMAOH) solution with a mass fraction of 25%, stir at room temperature for 36 h, then add LiOH solid powder with a mass of 0.07 g, stir at room temperature for 24 h, centrifuge, and dissolve the solid The isolate was re-dispersed in 500 mL deionized water, ultrasonicated for 1 h, and the solution was centrifuged at 3500 rpm for 1 h, and the supernatant obtained was a MXene solution with small flakes and 50% -OH functional group content.

[0066] (2) Preparation ...

Embodiment 2

[0076] (1) Preparation of MXene solution with small flakes and -OH functional group content of 30%

[0077] Weigh 10g Ti 3 AlC 2 (MAX) powder was slowly added to 100 mL of HF solution with a mass fraction of 40%, and stirred continuously for 24 h at 70°C. Then, the fully etched solid product was washed with deionized water for 3 to 5 times, and then placed in an oven at 80° C. for 12 hours in vacuum to obtain a powder product.

[0078] Weigh 2 g of the above powder, add 50 mL of tetramethylammonium hydroxide (TMAOH) solution with a mass fraction of 25%, stir at room temperature for 48 h, then add LiOH solid powder with a mass of 0.08 g, stir at room temperature for 36 h, centrifuge, and dissolve the solid The isolate was redispersed in 500mL deionized water, ultrasonicated for 1.5h, and the solution was centrifuged at 3500rpm for 1h, and the supernatant obtained was a MXene solution with small flakes and a -OH functional group content of 30%.

[0079] (2) Preparation of dis...

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Abstract

The invention provides a kind of preparation method of the nano-iron oxide composite material that MXene induces growth, comprises the following steps: A) with Ti 3 AlC 2 Adding to HF solution for etching to obtain an etching product; B) mixing the etching product with a tetramethylammonium hydroxide solution for intercalation, then adding LiOH for reaction to obtain an intermediate product; The mass ratio of LiOH to the etching product is (0.04-0.09): 1; C) disperse the intermediate product in water, centrifuge after ultrasonication for 1-1.5 hours, and the obtained supernatant is MXene solution; D) The MXene solution is sequentially added with iron salt solution and lye for in-situ growth to obtain nano-iron oxide composite material; the iron salt solution includes iron salt and dispersant. The invention also provides a nano-iron oxide composite material induced by MXene and an application thereof.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an MXene-induced growth nano-iron oxide composite material, a preparation method and an application thereof. Background technique [0002] Lithium-ion batteries have the characteristics of low cost, environmental friendliness, high energy density, no memory effect, and light weight. They are widely used in many fields such as mobile phones, computers, and electric vehicles. At present, graphite is generally used as a traditional negative electrode material, but the specific capacity of this material is low. With the needs of social development, new negative electrode materials with higher specific capacity have received more and more attention. Iron oxide is one of them. It has the following advantages when used in the negative electrode of lithium-ion batteries: (1) high mass specific capacity (1007mAh / g); (2) abundant natural reserves; (3) non-toxic an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 雷达陈志金周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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