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A kind of preparation method of sns2/tio2 sodium ion battery anode material with high cycle performance

A sodium-ion battery, cycle performance technology, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of small yield of nanosheets, incomplete reaction, poor controllability, etc., to achieve excellent cycle performance, good cycle stability, strong crystallization effect

Active Publication Date: 2018-10-23
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

Method used

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  • A kind of preparation method of sns2/tio2 sodium ion battery anode material with high cycle performance
  • A kind of preparation method of sns2/tio2 sodium ion battery anode material with high cycle performance

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preparation example Construction

[0026] A high cycle performance SnS 2 / TiO 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0027] 1) SnCl 4 ·5H 2 Dissolve O in deionized water and prepare a solution A with a concentration of 0.6-1.0 mol / L, according to the mass ratio of elements m Sn :m S =(1.85~2.8):(1.0~1.53) sodium thiosulfate is dissolved in an equal amount of deionized water (that is, with dissolved SnCl 4 ·5H 2 The amount of deionized water of O is equal to) to be prepared into solution B;

[0028] 2) Under the action of magnetic stirring, add solution B dropwise into solution A, and continue stirring to obtain a uniform mixed solution C;

[0029]3) According to the element molar ratio n Ti :n Sn =(1~5): The ratio of 10 is to dissolve butyl titanate in absolute ethanol to obtain mixed solution D, and the ratio of absolute ethanol to the total volume of deionized water used in step 1) is (1~5): (1~7), under the action of magn...

Embodiment 1

[0034] 1) SnCl 4 ·5H 2 O was dissolved in deionized water and prepared into a solution A with a concentration of 0.6mol / L, according to the element mass ratio m Sn :m S =1.85:1.0 Sodium thiosulfate is dissolved in an equal amount of deionized water to prepare solution B;

[0035] 2) Add solution B dropwise into solution A under the action of magnetic stirring, and keep stirring to obtain a uniformly mixed solution C.

[0036] 3) According to the element molar ratio n Ti :n Sn = 1:10 ratio Dissolve butyl titanate in absolute ethanol to obtain a mixed solution D, the total volume ratio of absolute ethanol to deionized water is 1:1, add the mixed solution D dropwise under the action of magnetic stirring To mixed solution C to obtain solution E. Add 5mol / L dilute HNO dropwise to the mixed solution E 3 , adjust solution pH=3 to form solution F;

[0037] 4) Put the F solution into a homogeneous hydrothermal reactor and seal it, and control the filling ratio at 40%, put it in...

Embodiment 2

[0040] 1) SnCl 4 ·5H 2 O was dissolved in deionized water and prepared into a solution A with a concentration of 0.8mol / L, according to the element mass ratio m Sn :m S =2.0:1.3 Sodium thiosulfate is dissolved in an equal amount of deionized water to prepare solution B;

[0041] 2) Add solution B dropwise into solution A under the action of magnetic stirring, and keep stirring to obtain a uniformly mixed solution C.

[0042] 3) According to the element molar ratio n Ti :n Sn = 3:10 ratio Dissolve butyl titanate in absolute ethanol to obtain a mixed solution D, the total volume ratio of absolute ethanol to deionized water is 2:3, add the mixed solution D dropwise under the action of magnetic stirring To mixed solution C to obtain solution E. Add 5mol / L dilute HNO dropwise to the mixed solution E 3 , adjust solution pH=7 to form solution F;

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

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Abstract

The invention discloses a preparation method of high cycle performance SnS2 / TiO2 sodium ion battery anode materials. The preparation method includes the steps: 1) dissolving SnCl4.5H2O into deionized water to prepare solution A, and dissolving sodium thiosulfate into the same amount of deionized water to prepare solution B; 2) gradually dropping the solution B into the solution A under the stirring action of magnetic force, and continually stirring to obtain uniformly mixed solution C; 3) dissolving butyl titanate into absolute ethyl alcohol to obtain mixed solution D, gradually dropping the solution D into the solution C under the stirring action of magnetic force to obtain mixed solution E, and adjusting solution pH (potential of hydrogen) to reach a range from 3 to 9 to form solution F; 4) placing the solution F into a homogeneous-phase hydrothermal reaction kettle to seal, and performing reaction in the homogeneous-phase hydrothermal reaction kettle; 5) taking out precursors after reaction is finished, respectively and centrifugally washing by the deionized water and absolute ethyl alcohol, and carrying out freeze-drying to obtain the high cycle performance SnS2 / TiO2 sodium ion battery anode materials. The preparation method is low in preparation cost and preparation period, and the prepared SnS2 / TiO2 sodium ion battery anode materials have high cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a sodium ion battery, in particular to a SnS with high cycle performance 2 / TiO 2 A preparation method of a negative electrode material for a sodium ion battery. Background technique [0002] With the increasing pressure of resource scarcity, energy crisis and environmental pollution, looking for an efficient clean energy has become the focus of all countries, and the use and development of secondary rechargeable batteries is by far the most effective way to solve the energy and environmental crisis. Among them, the sodium ion battery is an electrochemical energy storage power source, which has the advantages of abundant raw material resources, low price, high specific energy, and good safety performance. Compared with lithium-ion batteries, sodium-ion batteries have various excellent properties and relatively stable electrochemical performance, making them expected to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58
CPCH01M4/362H01M4/485H01M4/5815Y02E60/10
Inventor 殷立雄程如亮张峰黄剑锋房佳萌孔新刚柴思敏刘长青
Owner SHAANXI UNIV OF SCI & TECH
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