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Manganous fluoride-carbon composite material as well as preparation method and application thereof

A technology of carbon composite materials and manganous fluoride, applied in electrochemical generators, active material electrodes, electrical components, etc., can solve problems such as shortening the service life of lithium-ion batteries, capacity decay of lithium-ion batteries, and large volume expansion effects , achieve broad market application prospects, mild reaction conditions and easy control, and increase the effect of contact area

Pending Publication Date: 2022-04-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, graphite is still the most widely used electrode material in lithium-ion batteries, but it is prone to structural collapse during charging and discharging, and has a large volume expansion effect, which will cause the capacity of lithium-ion batteries to decay continuously and shorten the battery life. The service life of lithium-ion batteries is difficult to meet the growing demand

Method used

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  • Manganous fluoride-carbon composite material as well as preparation method and application thereof
  • Manganous fluoride-carbon composite material as well as preparation method and application thereof
  • Manganous fluoride-carbon composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] A kind of manganese fluoride-carbon composite material, its preparation method comprises the following steps:

[0082] Step 1): Dissolve 0.502g manganese nitrate tetrahydrate in N,N-dimethylformamide (35mL), stir continuously, then add 0.3623g of 1,4-phthalic acid (H 2 BDC) and 1.5g polyvinylpyrrolidone, stirred and dissolved, then transferred to the reaction kettle, reacted at 110°C for 24h, then filtered to separate the solid product and rinsed it with N,N-dimethylformamide several times to obtain a white precipitate , and then put the white precipitate into an air-drying oven, and dry it at 60° C. for 8 h to obtain a layered Mn-BDC precursor (referred to as Mn-BDC).

[0083] Step 2): Mn-BDC and ammonium fluoride were mixed according to the mass ratio of 1:15, placed in an oxygen atmosphere, and calcined at 600°C for 3 hours to obtain a manganous fluoride-carbon composite material (referred to as Ov-DMF@OFs).

[0084] Characterization test

[0085] (1) SEM character...

Embodiment 2

[0133] Step 1): Dissolve 0.502g manganese nitrate tetrahydrate in N,N-dimethylformamide (35mL), stir continuously, then add 0.3623g of 1,4-phthalic acid (H 2 BDC) was stirred until dissolved, then transferred to the reaction kettle, reacted at 110°C for 24 hours, and then filtered to separate the solid product and rinsed with N,N-dimethylformamide several times to obtain a white precipitate, and then put the white precipitate Put it into an air-drying oven and dry at 60° C. for 8 hours to obtain an amorphous Mn-BDC precursor.

[0134] Step 2): Put 0.1 g of Mn-BDC and 10 mL of hydrofluoric acid into a 110° C. reactor for 12 hours to react to obtain a manganous fluoride-carbon composite material (referred to as MFC-VS).

[0135] After testing (the test method is the same as in Example 1), the composition of MFC-VS and Ov-DMF@OFs is highly similar, and the negative electrode of the lithium-ion battery assembled by it also has the characteristics of good cycle stability and long s...

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Abstract

The invention discloses a manganous fluoride-carbon composite material as well as a preparation method and application thereof. The manganous fluoride-carbon composite material comprises an oxygen vacancy-containing heteroatom-doped carbon matrix and in-situ loaded MnF2, and the preparation method comprises the following steps: 1) dispersing a divalent manganese salt and terephthalic acid in an organic solvent, and carrying out a solvothermal reaction to obtain a Mn-BDC precursor; and 2) mixing the Mn-BDC precursor with ammonium fluoride, and calcining the mixture in an oxygen atmosphere, or placing the Mn-BDC precursor in a hydrofluoric acid atmosphere for reaction to obtain the manganous fluoride-carbon composite material. The manganous fluoride-carbon composite material provided by the invention has a heteroatom doped carbon matrix, MnF2 nanoparticles and oxygen vacancies, has good long cycle stability and rate capability when being used as a negative electrode material of a lithium ion battery, and is simple in preparation process and suitable for practical popularization and application.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a manganous fluoride-carbon composite material and a preparation method and application thereof. Background technique [0002] Lithium Ion cells and Batteries (LIBs) are relatively clean, lightweight, portable, rechargeable and rechargeable, and are a research hotspot in the field of energy storage technology. At present, graphite is still the most widely used electrode material in lithium-ion batteries, but it is prone to structural collapse during charging and discharging, and has a large volume expansion effect, which will cause the capacity of lithium-ion batteries to decay continuously and shorten the battery life. The service life of lithium-ion batteries is difficult to meet the growing demand. [0003] Therefore, there is an urgent need to develop a new lithium-ion battery anode material with high capacity at high current density, good cycle stability, simp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/136H01M10/0525
CPCH01M4/62H01M4/582H01M4/136H01M10/0525H01M2004/027Y02E60/10
Inventor 刘家玮张誉泽黄倩红谭骁鸿林晓明许旋罗一帆
Owner SOUTH CHINA NORMAL UNIVERSITY
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