A kind of sno2 nanorod for negative electrode of lithium ion battery and preparation method thereof

A lithium-ion battery and nanorod technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of cyclohexane toxic substance reaction cycle, limited wide application, high production cost, etc. Achieve the effects of improving cycle stability and specific capacity, increasing transmission rate, and shortening cycle

Active Publication Date: 2019-03-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent publication No. CN 1052364712 A published in January 2016 discloses a method for preparing tin dioxide nanorods with a controllable aspect ratio. The method uses cyclohexane as a solvent and reacts by solvothermal method, but Cyclohexane is a toxic substance and the reaction cycle is long, which limits the wide application of this method
Although the method is simple in steps, sulfur is a toxic substance, and the production cost is high with absolute ethanol as a solvent (Lei D, Zhang M, Qu B, et al.Hierarchical tin-based microspheres: Solvothermal synthesis, chemical conversion, mechanism and application in lithium ion batteries[J].Electrochimica Acta,2013,106:386-391)

Method used

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  • A kind of sno2 nanorod for negative electrode of lithium ion battery and preparation method thereof
  • A kind of sno2 nanorod for negative electrode of lithium ion battery and preparation method thereof
  • A kind of sno2 nanorod for negative electrode of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 0.451g SnCl 2 ·2H 2 Add O into 40mL deionized water, stir for 5min to SnCl 2 ·2H 2 After the O is completely dissolved, a milky white solution is obtained. Add 0.05g of super P with a particle size of 30-40 nm to the milky white solution, and then ultrasonically treat it for 20 minutes at a power of 80W and a temperature of 30°C to make super P and Sn 2+ Full effect to get a uniform mixture, Sn in the mixture 2+ The concentration is 0.05mol·L -1 .

[0027] (2) Transfer the mixed liquid to the hydrothermal reactor, the filling degree of the reactor is 60%, and put the hydrothermal reactor into the MDS-10 high-throughput ultra-high pressure closed microwave digestion instrument; select the temperature control mode for reaction, The temperature control mode is: the reaction temperature is 120° C., the reaction time is 10 minutes, and the reaction is naturally cooled to room temperature after the reaction is completed.

[0028] (3) Centrifuge and wash the product obtained...

Embodiment 2

[0031] (1) Put 0.846g SnCl 2 ·2H 2 Add O into 50mL deionized water, stir for 5min to SnCl 2 ·2H 2 After the O is completely dissolved, a milky white solution is obtained. Add 0.1g of super P with a particle size of 30-40 nm to the milky white solution, and then sonicate it for 20 minutes at a power of 80W and a temperature of 50°C to make super P and Sn 2+ Full effect to get a uniform mixture, Sn in the mixture 2+ The concentration is 0.075mol·L -1 .

[0032] (2) Transfer the mixed liquid to the hydrothermal reactor, the filling degree of the reactor is 80%, and put the hydrothermal reactor into the MDS-10 high-throughput ultra-high pressure closed microwave digestion apparatus; select the temperature control mode for reaction, The temperature control mode is: the reaction temperature is 120°C, the reaction time is 20min, and the reaction is naturally cooled to room temperature after the reaction.

[0033] (3) Centrifuge and wash the product obtained in step (2) at a rotation speed ...

Embodiment 3

[0037] (1) Add 1.128g SnCl 2 ·2H 2 Add O into 80mL deionized water, stir for 5min to SnCl 2 ·2H 2 After O is completely dissolved, a milky white solution is obtained. Add 0.2g of super P with a particle size of 30-40nm to the milky white solution, and then sonicate it for 20 minutes at a power of 100W and a temperature of 50℃ to make super P and Sn 2+ Full effect to get a uniform mixture, Sn in the mixture 2+ The concentration is 0.062mol·L -1 .

[0038] (2) Transfer the mixed liquid to the hydrothermal reactor, the filling degree of the reactor is 70%, and put the hydrothermal reactor into the MDS-10 high-flux ultra-high pressure closed microwave digestion instrument; select the temperature control mode for reaction, The temperature control mode is: the reaction temperature is 150° C., the reaction time is 20 min, and the reaction is naturally cooled to room temperature after the reaction.

[0039] (3) Centrifuge and wash the product obtained in step (2) at a rotation speed of 9000...

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Abstract

The invention relates to a SnO2 nanorod for a negative electrode of a lithium ion battery, and a preparation method of the SnO2 nanorod. The preparation method comprises the following steps of: adding SnCl2*2H2O into deionized water to obtain milky solution, and performing ultrasonic treatment after adding super P into the milky solution so as to obtain uniform mixed solution; performing microwave hydrothermal reaction of the mixed solution to obtain a SnO2 / super P composite material; and sintering the SnO2 / super P composite material so as to obtain the SnO2 nanorod. According to the SnO2 nanorod for the negative electrode of the lithium ion battery, and the preparation method of the SnO2 nanorod disclosed by the invention, the super P is used as a template; the structure of a nano material can be controlled to a certain degree, such that aggregation of the nano material is inhibited; compared with the conventional hydrothermal method, a microwave hydrothermal method has the advantages that: microwave is used as a heating tool; stirring in a molecular level is realized; the non-uniform heating disadvantage of a hydrothermal container is overcome; the reaction time is shortened; the working efficiency is increased; and the nano material having complete crystallization and uniform particle size distribution can be prepared; and furthermore, the method is simple to operate, short in period and low in cost, and is suitable for large-scale production.

Description

Technical field [0001] The invention relates to a method for preparing a negative electrode material for a lithium ion battery, in particular to a SnO for the negative electrode of a lithium ion battery 2 Nanorod and its preparation method. Background technique [0002] Tin dioxide (SnO 2 ) Due to the theoretical capacity (782mAhg -1 ) High, low cost, low toxicity and wide range of practicality, and is considered to be one of the most potential lithium-ion battery anode materials. However, in the process of alloying and dealloying (intercalation and de-alloying) tin oxide with lithium ions, a large volume deformation will be produced, which will result in the gradual powdering of electrode materials and rapid capacity degradation. [0003] Studies have shown that the structural control of materials can change the properties of the material itself. For example, making the material one-dimensional will reduce the dimensionality and structural size of the material, which can present n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M10/0525C01G19/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G19/02H01M4/483H01M10/0525Y02E60/10
Inventor 黄剑锋席乔程娅伊李嘉胤曹丽云许占位郭玲齐慧
Owner SHAANXI UNIV OF SCI & TECH
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