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A kind of preparation method of stannous sulfide/nitrogen-doped carbon composite curd and its application in lithium-ion battery negative electrode

A technology of nitrogen-doped carbon and stannous sulfide, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of enhancing electrochemical lithium storage performance, expanding industrial applications, and large specific surface area

Active Publication Date: 2020-09-01
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also there is no tin sulfide / nitrogen-doped carbon composite curd in the prior art

Method used

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  • A kind of preparation method of stannous sulfide/nitrogen-doped carbon composite curd and its application in lithium-ion battery negative electrode
  • A kind of preparation method of stannous sulfide/nitrogen-doped carbon composite curd and its application in lithium-ion battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Under stirring, dissolve 11mmol of glucosamine hydrochloride in 60mL of deionized water to form a solution, that is, the concentration of glucosamine hydrochloride is 0.18mol / L; add 3mmol of sodium stannate under stirring, that is, the concentration of sodium stannate 0.05mol / L; under stirring, slowly add 15mmol of L-cysteine, and finally transfer the solution to a 100mL stainless steel reaction kettle lined with polytetrafluoroethylene after it is completely dissolved. Placed in a dry box, hydrothermally reacted at 200°C for 24 hours. Then it was naturally cooled to room temperature, rinsed three times with deionized water and absolute ethanol respectively, centrifuged and vacuum-dried at 60°C for 12 hours to obtain a hydrothermal product. A certain amount of hydrothermal product is placed in a porcelain boat, put into a tube furnace, calcined at 600°C for 2 hours under an argon atmosphere, and cooled naturally to room temperature to obtain the product.

[0038] The X...

Embodiment 2

[0044] This embodiment is the second embodiment of the stannous sulfide / nitrogen-doped carbon composite curd of the present invention. The difference from Example 1 is that the amount of glucosamine hydrochloride added is 14 mmol, i.e. the concentration of glucosamine hydrochloride Be 0.23mol / L; Other raw materials and steps are identical with embodiment 1.

[0045] The X-ray diffraction pattern of product is consistent with embodiment 1; Scanning electron microscope test shows that average diameter is 2.8 μ m;

[0046] The reversible capacity of the first cycle is 1026 mAh / g, and the reversible capacity of the composite electrode is 925 mAh / g after 50 cycles.

Embodiment 3

[0048] The difference from Example 1 is that the amount of glucosamine hydrochloride added is 9 mmol, that is, the concentration of glucosamine hydrochloride is 0.15 mol / L; other raw materials and steps are the same as in Example 1.

[0049] The X-ray diffraction pattern of product is consistent with embodiment 1; Scanning electron microscope test shows that average diameter is 1.9 μ m;

[0050] The reversible capacity of the first cycle is 1112 mAh / g, and the reversible capacity of the composite electrode is 1020 mAh / g after 50 cycles.

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Abstract

The invention discloses a preparation method of stannous sulfide / nitrogen-doped carbon composite ball-flower. The preparation method comprises the following steps: S1, preparing an aqueous solution ofamino glucose hydrochloride and sodium stannate, wherein the concentration of amino glucose hydrochloride is 0.10 to 0.25 mol / L, and the concentration of stannate ions of sodium stannate is 0.02 to 0.07 mol / L; S2, adding L-cysteine into an aqueous solution of S1, and obtaining a mixed solution; S3, enabling the mixed solution to have hydrothermal reaction, and obtaining a precursor; and S4, calcining the precursor in an inertial gas atmosphere, and obtaining a stannous sulfide / nitrogen-doped carbon composite ball-flower. The prepared stannous sulfide / nitrogen-doped carbon composite ball-flower has large specific surface area, more lithium storage active sites, can provide more short lithium ion diffusion channels, can improve the electrochemical lithium storage performance, and has high specific capacity and excellent cycling stability in a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic micro-nano materials, and more specifically, to a preparation method of a tin sulfide / nitrogen-doped carbon composite curd and its application in a negative electrode of a lithium-ion battery. Background technique [0002] In contemporary society, energy issues have undoubtedly become one of the major global issues and have attracted widespread attention. Finding new materials that can have special effects in energy storage and use has become one of the important tasks of scientists. Lithium-ion batteries have excellent properties such as high specific energy, no memory effect, and environmental friendliness, and have been widely used in portable mobile appliances such as mobile phones and notebook computers. At present, graphite materials are mainly used as anode materials for lithium-ion batteries. These graphite materials have good cycle stability, but their capacity is low. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/5815H01M4/587H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 马琳许丽梅凌妍徐旭耀占亮宁小媚
Owner LINGNAN NORMAL UNIV
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