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A kind of particle assembly cauliflower-like sno2 sodium ion battery negative electrode material and preparation method thereof

A sodium-ion battery and negative electrode material technology, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of finding sodium intercalation materials, and achieve the effects of short preparation cycle, low preparation cost and strong crystallinity

Active Publication Date: 2018-08-24
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 particle assembly cauliflower-like sno2 sodium ion battery negative electrode material and preparation method thereof
  • A kind of particle assembly cauliflower-like sno2 sodium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A particle-assembled cauliflower-like 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 =1:0.4 Add polyvinylpyrrolidone (PVP) 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 0.5mol / 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 4:3;

[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 100°C, and control the reaction time at 12h;

[0025] 4) After the reaction is over...

Embodiment 2

[0028] A particle-assembled cauliflower-like 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 was dissolved in deionized water and prepared into a solution A with a concentration of 0.9mol / L; according to the mass ratio m SnCl4·5H2O : m PVP =1:1.0 Add polyvinylpyridine pyrrolidone (PVP) 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 1.5mol / 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 5:2;

[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 150°C, and control the reaction time at 48h;

[0032] 4) After the reacti...

Embodiment 3

[0034] A particle-assembled cauliflower-like 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 =1:1.5 Add polyvinylpyridine pyrrolidone (PVP) 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 1.0mol / 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 6:1;

[0037] 3) After the reaction is finished, put the D solution into the hydrothermal reaction kettle and seal it, put it into the homogeneous hydrothermal reaction apparatus, control the reaction temperature at 200°C, and control the reaction time at 24h;

[0038] 4) After the reac...

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Abstract

The invention discloses a particle-assembled cauliflower-shaped SnO2 sodium-ion battery cathode material and a preparation method thereof. The preparation method comprises the steps that 1, SnCl4.5H2O and PVP are dissolved into an equal amount of deionized water separately to prepare a solution A and a solution B; 2, the solution B is slowly added into the solution A under the continuous magnetic stirring action to form an uniform solution C, and a NaOH solution E is dropwise added into the solution C to form a solution D; 3, a homogeneous-phase hydrothermal reaction is performed; 4, after the reaction is finished, precursors are taken out to be washed to obtain white precursors, freeze drying is performed, and then the particle-assembled cauliflower-shaped SnO2 sodium-ion battery cathode material is obtained. The preparation method has the advantages of being low in preparation cost, easy to operate and short in preparation cycle; the prepared particle-assembled cauliflower-shaped SnO2 sodium-ion battery cathode material has the advantages that under the current density of 100 mA / g, the first-time discharge capacity can reach 769 mAh / g, the coulombic efficiency is higher than 98% from the second cycle, and after cycling is performed for 50 times, the higher capacity retention ratio is achieved.

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): H01M4/48H01M4/131H01M4/1391H01M10/054
CPCH01M4/131H01M4/1391H01M4/483H01M10/054H01M2004/027Y02E60/10
Inventor 殷立雄柴思敏张浩马建中黄剑锋王菲菲孔新刚
Owner SHAANXI UNIV OF SCI & TECH