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A kind of nanoparticle assembly spherical SNO2 sodium ion battery negative electrode material and preparation method thereof

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the difficulty of finding sodium-intercalated materials and other problems, and achieve good cycle stability, strong crystallinity, and high purity.

Active Publication Date: 2018-09-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with lithium ions, sodium ions have a larger ionic radius (0.102nm vs. 0.076nm of Li), which makes it difficult to find suitable sodium intercalation materials

Method used

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  • A kind of nanoparticle assembly spherical SNO2 sodium ion battery negative electrode material and preparation method thereof
  • A kind of nanoparticle assembly spherical SNO2 sodium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A nanoparticle-assembled spherical SnO 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0022] 1) SnCl 4 ·5H 2 O is dissolved in deionized water and prepared as a solution A with a concentration of 0.5mol / L; according to the mass ratio m SnCl4·5H2O : m PVP :m Na3C6H5O7 =1:0.4:0.4 Add polyvinylpyridine rolidone (PVP) in solution A, sodium citrate (Na 3 C 6 h 5 o 7 ) was added into an equal amount of deionized water to prepare solution B;

[0023] 2) Slowly add solution B to solution A under continuous magnetic stirring to form a uniform solution C, and add 0.3mol / L N a OH solution E to form solution D, and then continue to stir for 0.5h; the volume ratio of solution C to solution E is 5:1;

[0024] 3) After the reaction is finished, put the D solution into the hydrothermal reaction kettle and seal it, put it into a homogeneous hydrothermal reaction apparatus, control the reaction temperature at...

Embodiment 2

[0028] A nanoparticle-assembled spherical SnO 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0029] 1) SnCl 4 ·5H 2 O is dissolved in deionized water and prepared as a solution A with a concentration of 0.5mol / L; according to the mass ratio m SnCl4·5H2O : m PVP :m Na3C6H5O7 =1:0.8:1.5 Add polyvinylpyridine rolidone (PVP) in solution A, sodium citrate (Na 3 C 6 h 5 o 7 ) was added into an equal amount of deionized water to prepare solution B;

[0030] 2) Slowly add solution B to solution A under continuous magnetic stirring to form a uniform solution C, and add 1.2mol / L N a OH solution E to form solution D, and then continue to stir for 1h; the volume ratio of solution C to solution E is 3:3;

[0031] 3) After the reaction is finished, put the D solution into the hydrothermal reaction kettle and seal it, put it into a homogeneous hydrothermal reaction apparatus, control the reaction temperature at 1...

Embodiment 3

[0034] A nanoparticle-assembled spherical SnO 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0035] 1) SnCl 4 ·5H 2 O was dissolved in deionized water and prepared into a solution A with a concentration of 1.2mol / L; according to the mass ratio m SnCl4·5H2O : m PVP :m Na3C6H5O7 =1:1.5:1.5 Add polyvinylpyridine rolidone (PVP) in solution A, sodium citrate (Na 3 C 6 h 5 o 7 ) was added into an equal amount of deionized water to prepare solution B;

[0036] 2) Slowly add solution B to solution A under continuous magnetic stirring to form a uniform solution C, and add 0.9mol / L N a OH solution E to form solution D, and then continue to stir for 2h; the volume ratio of solution C to solution E is 2:4;

[0037] 3) After the reaction is finished, put the D solution into a hydrothermal reaction kettle and seal it, put it into a homogeneous hydrothermal reaction apparatus, control the reaction temperature at ...

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Abstract

The invention discloses a nano-particle-assembled spherical SnO2 sodium-ion battery cathode material and a preparation method thereof. The method comprises the following steps of (1) dissolving SnC14.5H2O into deionized water to prepare solution A; adding PVP into the solution A and adding sodium citrate into the equivalent deionized water to prepare solution B; (2) slowly adding the solution B into the solution A to form homogeneous solution C under the action of continuous magnetic stirring and dropwise adding NaOH solution E into the solution C to form solution D; (3) carrying out homogeneous phase hydrothermal reaction; and (4) after the reaction is complete, taking a precursor out, washing to obtain a white precursor, and freezing and drying the precursor to obtain the nano-particle-assembled spherical SnO2 sodium-ion battery cathode material. The preparation method has the characteristics of low cost, easy operation and short preparation period; the first discharge capacity of the nano-particle-assembled spherical SnO2 sodium-ion battery cathode material is up to 409 mAh / g under the current density of 100 mA / g, and after circulation for 70 times, the capacity is kept at 225.8 mA / g-1, and the cycling stability is better.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a negative electrode material for a sodium ion battery and a preparation method thereof. Background technique [0002] Sodium-ion battery is a new type of electrochemical power source, which has the advantages of abundant raw material resources, low cost, high specific capacity and high efficiency, and is more in line with the requirements of large-scale energy storage applications. It has application potential in improving power utilization efficiency and power quality. At the same time, due to its significant advantages such as high specific capacity, light weight, long life and no memory, it also has a wide range of applications in aerospace, hybrid electric vehicles and portable electronic devices. . In this context, sodium-ion batteries have attracted worldwide attention in recent years, and research on key materials and related technologies has progressed rapi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48
CPCH01M4/48Y02E60/10
Inventor 殷立雄柴思敏刘长青马建中黄剑锋王菲菲孔新刚
Owner SHAANXI UNIV OF SCI & TECH
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