Preparation method for flocculus-shaped SnS<2> negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of small output of nanosheets, incomplete reaction, poor controllability, etc., to achieve The effect of controllable grain growth, uniform morphology and fast reaction rate

Active Publication Date: 2017-03-29
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

Among them, the solid-phase reaction method has the advantages of no need for solvents, simple equipment, and easy control of reaction conditions, but because the reaction is carried out in the solid phase, the reaction is usually incomplete and the yield is low.
Mechanical exfoliation is commonly used to obtain highly crystalline ultrathin SnS 2 Nanosheets, but the yield of nanosheets obtained by this method is very small, and the controllability is very poor, so it can only be applied to basic scientific research

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  • Preparation method for flocculus-shaped SnS&lt;2&gt; negative electrode material of lithium ion battery
  • Preparation method for flocculus-shaped SnS&lt;2&gt; negative electrode material of lithium ion battery

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preparation example Construction

[0025] A pompom-shaped SnS 2 The preparation method of lithium ion battery negative electrode material, comprises the following steps:

[0026] 1) Sodium thiosulfate (Na 2 S 2 o 2 ) was dissolved in deionized water and prepared into a solution A with a concentration of 0.5 to 1.6 mol / L, according to the molar ratio of elements n Sn :n S =(1.0~2.5):(2.0~4.7) tin chloride pentahydrate (SnCl 4 ·5H 2 O) being dissolved in an equal amount of deionized water (i.e. equal to the deionized water of dissolving sodium thiosulfate) to prepare solution B;

[0027] 2) Add solution B dropwise to solution A under the action of magnetic stirring, and continue to stir to form a uniform mixed solution C, press n under the action of magnetic stirring 硫代硫酸钠 :n 乙二醇 =(1.4~3.8):(2.6~7.9) ratio ethylene glycol is gradually added in the mixed solution C to form a uniformly mixed solution D;

[0028] 3) Under the action of magnetic stirring, add an organic alkali source (triethanolamine, lithiu...

Embodiment 1

[0033] 1) Sodium thiosulfate (Na 2 S 2 o 2 ) was dissolved in deionized water, and prepared into a solution A with a concentration of 0.5mol / L, according to the molar ratio of elements n Sn :n S =1.0:2.0 tin chloride pentahydrate (SnCl 4 ·5H 2 O) be dissolved in equal amount of deionized water and be prepared into solution B;

[0034] 2) Add solution B dropwise to solution A under the action of magnetic stirring, and continue to stir to form a uniform mixed solution C, press n under the action of magnetic stirring 硫代硫酸钠 :n 乙二醇 The ratio of =1.4:2.6 gradually adds ethylene glycol into the mixed solution C to form a uniformly mixed solution D;

[0035] 3) Under the action of magnetic stirring, add organic alkali source triethanolamine dropwise to the mixed solution D, and adjust the pH of the solution to 2 to form a solution E;

[0036] 4) Put the E solution into a homogeneous hydrothermal reactor and seal it, and control the filling ratio at 40%, put it into a homogeneo...

Embodiment 2

[0040] 1) Sodium thiosulfate (Na 2 S 2 o 2 ) was dissolved in deionized water, and prepared into a solution A with a concentration of 1.0mol / L, according to the molar ratio of elements n Sn :n S =2.0:3.5 tin chloride pentahydrate (SnCl 4 ·5H 2 O) be dissolved in equal amount of deionized water and be prepared into solution B;

[0041] 2) Add solution B dropwise to solution A under the action of magnetic stirring, and continue to stir to form a uniform mixed solution C, press n under the action of magnetic stirring 硫代硫酸钠 :n 乙二醇 The ratio of =2.5:5.3 gradually adds ethylene glycol into the mixed solution C to form a uniformly mixed solution D;

[0042] 3) Under the action of magnetic stirring, add organic alkali source lithium diisopropylamide dropwise to the mixed solution D to adjust the pH of the solution to 6 to form a solution E;

[0043] 4) Put the E solution into a homogeneous hydrothermal reactor and seal it, and control the filling ratio at 50%, put it into a ho...

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Abstract

The invention discloses a preparation method for a flocculus-shaped SnS<2> negative electrode material of a lithium ion battery. The preparation method comprises the steps of 1) dissolving sodium thiosulfate into deionized water to prepare a solution A, and dissolving stannic chloride pentahydrate into deionized water to prepare a solution B; 2) adding the solution B into the solution A dropwise, continuously stirring to obtain a uniform mixed solution C, and gradually adding ethylene glycol into the mixed solution C to form a uniformly-mixed solution D; 3) adjusting the pH of the mixed solution D to be 2-9 to form a solution E; 4) putting the solution E into a homogeneous hydrothermal reaction kettle to be sealed, and then putting into a homogeneous hydrothermal reactor to be reacted; and 5) after the reaction is completed, taking out a precursor, and performing centrifuging and washing by deionized water and absolute ethyl alcohol separately, and then performing freezing and drying to obtain the flocculus-shaped SnS<2> negative electrode material of the lithium ion battery. The preparation method is low in cost, simple in operation and short in preparation period; and the prepared flocculus-shaped SnS<2> negative electrode material of the lithium ion battery has relatively high cycling stability at high-current density.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, in particular to a pompom-shaped SnS 2 A method for preparing a negative electrode material for a lithium ion battery. 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 a wide range of applications. Currently, it is mainly used as an ideal power supply for 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 ne...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525C01G19/00B82Y30/00
CPCB82Y30/00C01G19/00H01M4/5815H01M10/0525Y02E60/10
Inventor 殷立雄程如亮张峰黄剑锋房佳萌孔新刚柴思敏张浩
Owner SHAANXI UNIV OF SCI & TECH
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