Preparation method of nanosheet self-assembled three-dimensional nano flower tin sulfide/graphitized carbon nitride lithium ion battery anode material

A technology of carbon nitride, three-dimensional nanometer, applied in the field of preparation of negative electrode materials of lithium ion batteries, can solve the problems of large salt consumption, long cycle, polluted ion exchange resin, etc., and achieves low preparation cost, high production efficiency, Controlled effect of grain growth

Active Publication Date: 2019-01-29
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

The solvothermal reaction method is an improved hydrothermal reaction method, using an organic solvent instead of the traditional water as a solvent, but the reaction process needs to strictly control the solvothermal conditions; the ion exchange method will produce excessive regeneration waste liquid, and the cycle is longer. High salt consumption, the presence of organic matter will contaminate the ion exchange resin

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  • Preparation method of nanosheet self-assembled three-dimensional nano flower tin sulfide/graphitized carbon nitride lithium ion battery anode material
  • Preparation method of nanosheet self-assembled three-dimensional nano flower tin sulfide/graphitized carbon nitride lithium ion battery anode material
  • Preparation method of nanosheet self-assembled three-dimensional nano flower tin sulfide/graphitized carbon nitride lithium ion battery anode material

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preparation example Construction

[0028] A preparation method of a nanosheet self-assembled three-dimensional nanoflower tin sulfide / graphitized carbon nitride lithium ion battery negative electrode material, comprising the following steps:

[0029] 1) Put 5-15g of melamine in a crucible with a cover, place it in a muffle furnace at 450-650°C for 2-6 hours, keep the heating rate at 2°C / min, and wait for it to cool down to room temperature naturally. Grind the yellow product finely in a mortar;

[0030] 2) Then disperse it in ethanol for 2 hours under vigorous stirring, and disperse 30-50 mg of the product obtained in step 1) in every 40-60 mL of ethanol. Subsequently, the suspension was centrifuged and washed several times with deionized water and absolute ethanol, and then vacuum-dried at 60-100 °C for 8-14 h. Finally, the yellow product g-C is obtained 3 N 4 .

[0031] 3) Add 30~50mg g-C 3 N 4 Dissolve in 40-60ml of deionized water, vigorously stir for 5 hours, and ultrasonically disperse for 3 hours. ...

Embodiment 1

[0038] 1) Put 5 g of melamine in a crucible with a cover, place it in a muffle furnace at 450°C for 2 hours, and keep the heating rate at 2°C / min. grind in a bowl;

[0039] 2) Then it was dispersed in ethanol for 2 hours under vigorous stirring, and 30 mg of the product obtained in step 1) was dispersed in every 40 mL of ethanol. Subsequently, the suspension was centrifuged and washed several times with deionized water and absolute ethanol, and then dried under vacuum at 60 °C for 8 h. Finally, the yellow product g-C is obtained 3 N 4 .

[0040] 3) Add 30mg g-C 3 N 4 Dissolve in 40ml deionized water, stir vigorously for 5 hours, and disperse ultrasonically for 3 hours. Suspension A is formed;

[0041] 4) Then slowly add 0.4g of PVP (polyvinylpyrrolidone) to the above suspension A, and magnetically stir for 10 minutes until it is completely dissolved to form solution B;

[0042] 5) According to the molar ratio of elements n S :n Sn =2:0.5 TAA (thioacetamide) and SnCl ...

Embodiment 2

[0046] 1) Put 10g of melamine in a crucible with a cover, place it in a muffle furnace at 550°C for 4 hours, and keep the heating rate at 2°C / min. grind in a bowl;

[0047] 2) Then it was dispersed in ethanol for 2 hours under vigorous stirring, and 40 mg of the product obtained in step 1) was dispersed in every 50 mL of ethanol. Subsequently, the suspension was centrifuged and washed several times with deionized water and absolute ethanol, and then dried under vacuum at 80 °C for 12 h. Finally, the yellow product g-C is obtained 3 N 4 .

[0048] 3) 40mg g-C 3 N 4 Dissolve in 50ml deionized water, stir vigorously for 5h, and disperse ultrasonically for 3h. Suspension A is formed;

[0049] 4) Then slowly add 0.5g of PVP (polyvinylpyrrolidone) to the suspension A above, and stir magnetically for 10 minutes until completely dissolved to form solution B;

[0050] 5) According to the molar ratio of elements n S :n Sn＝ 2:1 TAA (thioacetamide) and SnCl 4 2H 2 O was added ...

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Abstract

The invention discloses a preparation method of a nanosheet self-assembled three-dimensional nano flower tin sulfide/graphitized carbon nitride lithium ion battery anode material. Melamine is kept at450-650 DEG C for 2-6 hours, is naturally cooled to room temperature, is ground for prepare use, and is dispersed in ethanol to obtain a suspension, the suspension is centrifuged and washed several times with deionized water and absolute ethanol, vacuum drying is conducted to obtain a product g-C3N4, the product g-C3N4 is dissolved in the deionized water, after stirring, the product g-C3N4 is ultrasonically dispersed to form a suspension A, PVP is added to the suspension A, stirring is conducted until the product g-C3N4 is completely dissolved to form a solution B, TAA and SnCl4 2H2O are addedto the solution B, stirring is uniformly conducted to form a solution C, the solution C is subjected to a microwave hydrothermal reaction, after the reaction is completed, a precursor is obtained, the precursor is centrifuged and washed several times with the deionized water and the absolute ethanol, and vacuum drying is conducted to obtain a nanosheet self-assembled three-dimensional nano flowerSnS2/g-C3N4 battery material.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, in particular to a preparation method of a nano sheet self-assembled three-dimensional nano flower tin sulfide / graphitized carbon nitride lithium ion battery negative electrode material. Background technique [0002] As a rechargeable secondary battery, lithium-ion batteries mainly rely on the deintercalation of lithium ions between the positive and negative electrodes to work. In addition, it has the advantages of high working voltage, long cycle life, large specific capacity, good safety performance, small self-discharge, and no memory effect. This advantage makes it widely used in portable devices such as mobile phones, cameras, and notebook computers. In recent years, through the continuous development and improvement of lithium-ion battery charge and discharge capacity, rate characteristics, and cycle performance, its use in new energy vehicles, el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 殷立雄蔺英程如亮张浩繁黄剑锋白培杰李慧敏宋佳琪
Owner SHAANXI UNIV OF SCI & TECH
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