Preparation method for nano-flake SnS2 sodium-ion battery negative electrode material with good rate capability

A sodium-ion battery, nano-sheet technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of irregular particle morphology and size, poor product quality, incomplete reaction, etc. The effect of uniform appearance, fast heating speed and full and thorough response

Inactive Publication Date: 2015-11-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the chemical precipitation method can undergo chemical reactions at room temperature, but usually the resulting products have poor quality (or amorphous), irregular particle shape and size, and a wide particle size distribution.
Although the solid-phase reaction method has advantages such as no need for solvents, simple equipment and easy control of reaction conditions, because the reaction is carried out in the solid phase, the reaction is usually not complete and the yield is low.

Method used

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  • Preparation method for nano-flake SnS2 sodium-ion battery negative electrode material with good rate capability
  • Preparation method for nano-flake SnS2 sodium-ion battery negative electrode material with good rate capability

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Experimental program
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Effect test

specific Embodiment 1

[0031] 1) SnCl 4 ·5H2 O was dissolved in deionized water to prepare solution A with a concentration of 0.5 mol / L, and at the same time, 1 mol / L of HCl or NH 4 ·H 2 O adjusts the pH of solution A to 1, NaS·9H 2 O was dissolved in deionized water to prepare solution B with a concentration of 0.1 mol / L.

[0032] 2) Dilute the two solutions of A and B according to the element molar ratio n Sn :n S = 1.0:2.0 was mixed to obtain solution C, and magnetically stirred at 26°C for 10 minutes to form a uniform and stable mixed solution D.

[0033] 3) Put the D solution into a homogeneous hydrothermal reaction kettle, seal the hydrothermal kettle, control the volume filling ratio to 50%, control the reaction temperature at 120°C, control the reaction time at 8h, and then turn off the power.

[0034] 4) After the reaction kettle was cooled, the precursor was taken out, separated by centrifugal washing, washed three times with deionized water, and then washed three times with absolute ...

specific Embodiment 2

[0035] 1) SnCl 4 ·5H 2 O was dissolved in deionized water to prepare a solution A with a concentration of 1mol / L, and at the same time, 1mol / L HCl or NH 4 ·H 2 O adjusts the pH of solution A to 7, NaS·9H 2 O was dissolved in deionized water to prepare solution B with a concentration of 2 mol / L.

[0036] 2) Dilute the two solutions of A and B according to the element molar ratio n Sn :n S =2:3 ratio mixed to obtain solution C, magnetically stirred at 26°C for 5min to form a uniform and stable mixed solution D.

[0037] 3) Put the D solution into a homogeneous hydrothermal reaction kettle, seal the hydrothermal kettle, control the volume filling ratio to 50%, control the reaction temperature at 160°C, control the reaction time at 12h, and then turn off the power.

[0038] 4) After the reaction kettle was cooled, the precursor was taken out, separated by centrifugal washing, washed twice with deionized water, and then washed twice with absolute ethanol to obtain a yellow-br...

specific Embodiment 3

[0039] 1) SnCl 4 ·5H 2 O was dissolved in deionized water to prepare a solution A with a concentration of 1.2 mol / L, and at the same time, 1 mol / L HCl or NH 4 ·H 2 O adjusts the pH of solution A to 9, NaS·9H 2 O was dissolved in deionized water to prepare solution B with a concentration of 2.4mol / L.

[0040] 2) Dilute the two solutions of A and B according to the element molar ratio n Sn :n S =2.5:4.3 ratio mixed to obtain solution C, magnetically stirred at 26°C for 30min to form a uniform and stable mixed solution D.

[0041] 3) Put the D solution into a homogeneous hydrothermal reaction kettle, seal the hydrothermal kettle, control the volume filling ratio to 60%, control the reaction temperature at 200°C, control the reaction time at 16h, and then turn off the power.

[0042] 4) After the reaction kettle was cooled, the precursor was taken out, separated by centrifugal washing, washed three times with deionized water, and then washed three times with absolute ethanol...

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Abstract

The invention discloses a preparation method for a nano-flake SnS2 sodium-ion battery negative electrode material with good rate capability, comprises: 1) preparing an Sn source solution A with the concentration of 0.5-1.2 mol / L, regulating the pH of the solution A to be 1-9; and preparing an S source solution B with the concentration of 0.1-2.4 mol / L; 2) mixing the solution A and the solution B at an element molar ratio of nSn: nS being equal to (1.0-2.5): (2.0-4.3), and uniformly stirring to form a solution D; 3) putting the solution D into a homogenous phase hydrothermal reaction kettle for performing a homogenous phase hydrothermal reaction; and 4), cooling the reaction kettle, then centrifuging, washing, separating and drying to obtain the nano-flake SnS2 sodium-ion battery negative electrode material, wherein under 100 mA / g current density, the initial discharge capacity of the negative electrode material reaches 745 mAh / g; and after circulating for 100 times, the capacity is kept at 560 mAh / g.

Description

【Technical field】 [0001] The invention relates to a preparation method of a negative electrode material of a sodium ion battery. 【Background technique】 [0002] Tin disulfide (SnS 2 ) belongs to IV: VI binary compounds, with CdI 2 type layered structure. This structural unit is composed of a sandwich structure (S-Sn-S) with tin ions added in the middle of two layers of hexagonal close-packed sulfur ions. There are six sulfur ions around each tin ion to form regular octahedral coordination, that is, sulfur ions ABAB hexagonal close packing is adopted, and metal tin ions are placed between two layers of sulfur ions, the layers are covalently bonded, and weak van der Waals forces exist between layers. SnS 2 There are many lattice vacancies in this layered structure, which can be used as the host lattice for "intercalation". The superior flexibility of this structure enables it to be used as a substrate to form intercalation compounds with unique photoelectric properties th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397
CPCH01M4/1397H01M4/5815H01M2004/027Y02E60/10
Inventor 殷立雄柴思敏马建中黄剑锋王菲菲张东东张浩孔新刚
Owner SHAANXI UNIV OF SCI & TECH
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