Preparation method of aerogel modified SnSb/carbon nanotube composite positive electrode material

A carbon nanotube composite and negative electrode material technology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of unsatisfactory cycle performance and low capacity, and achieve improved cycle stability, The effect of increasing capacity

Inactive Publication Date: 2015-03-04
SHENZHEN POLYTECHNIC
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: to overcome the problems of low capacity and unsatisfactory cycle performance of current lithium battery negative electrode materials, and propose a method for preparing an airgel-modified SnSb/carbo

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of aerogel modified SnSb/carbon nanotube composite positive electrode material
  • Preparation method of aerogel modified SnSb/carbon nanotube composite positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The present invention proposes a method for preparing an airgel-modified SnSb / carbon nanotube composite negative electrode material, comprising the following steps:

[0028] Step 1: Using industrial sodium silicate or tetraethyl orthosilicate as the silicon source, formamide and ethylene glycol as additives, and acetic acid as a catalyst, use sol-gel method and normal pressure drying method to prepare SiO2 airgel powder material stand-by;

[0029] Step 2: Separately with SnCl 2 2H 2 O and SbCl 3 For Sn and Sb sources, prepare a certain concentration of SnCl 2 and SbCl 3 Solution, add a certain amount of polyvinylpyrrolidone, then stir evenly to obtain A solution;

[0030] In step 2, prepare SnCl 2 and SbCl 3 The solution concentration is 0.05 ~ 0.3mol / L, SnCl 2 and SbCl 3 The ratio of the amount of substances is controlled in: SnCl 2 / SbCl 3 =3 ~ 1;

[0031] In step 2, the quality of adding polyvinylpyrrolidone is 5%~15% of the theoretically obtained SnSb al...

Embodiment 1

[0044] With 40wt% industrial water glass as the silicon source, appropriate amount of formamide and ethylene glycol are dropped into the water glass solution respectively, and the ratio of the three substances is 3:1:1. Use 0.5mol·L -1 Acetic acid was used to adjust the pH of the sol to 12, and the gel was obtained by standing at room temperature. The obtained gel was aged in deionized water for 72 hours, then washed with deionized water for several times, and finally soaked in absolute ethanol for 72 hours, and dried by atmospheric pressure classification (40 ° C, 50 ° C, 60 ° C and 80 ° C in sequence dried for 24h), and SiO 2 Airgel powder material.

[0045] Weigh 4.51g SnCl 2 2H 2 O and 2.28gSbCl 3 Dissolve in 200ml absolute ethanol, then add 0.45g polyvinylpyrrolidone therein and stir evenly to obtain A solution. Weigh 2.92g of NaBH 4 Dissolve in 520ml deionized water and add 1.5g NaOH to prepare 0.15mol / L NaBH 4 solution, called B solution. Add 0.05 g of carbon n...

Embodiment 2

[0049] The difference between this embodiment and embodiment 1 is: the described SnCl 2 2H 2 O and SbCl 3 The masses are 9.02g and 4.56g respectively, the mass of polyvinylpyrrolidone is 0.36g, and the mass of NaBH 4 Mass is 5.84g, carbon nanotube mass is 0.07g, SiO 2 The mass of the airgel is 1.44g, the heat preservation condition of the hydrothermal synthesis reaction is 24 hours at 160°C, and the vacuum drying condition of the obtained product is 10 hours at 60°C. Others are the same as in Example 1.

[0050] The constant current charge and discharge test of the composite negative electrode material described in this example shows that the electrochemical performance remains basically unchanged, and after 30 cycles, the reversible capacity can be maintained at 472mAh g -1 .

[0051]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Charge and discharge capacityaaaaaaaaaa
Reversible capacityaaaaaaaaaa
Reversible capacityaaaaaaaaaa
Login to view more

Abstract

A preparation method of an aerogel modified SnSb/carbon nanotube composite positive electrode material comprises the following steps: step1. preparing SiO2 aerogel powder material; step 2. preparing SnCl2 and SbCl3 by taking SnCl2.2H2O and SbCl3 as Sn and Sb sources, adding polyvinylpyrrolidone, and stirring evenly, thus obtaining a solution A; step 3. preparing NaBH4 solution and adding NaOH, thus obtaining a solution B; step 4. weighing a carbon nanotube, dissolving in the solution B, ultrasonically dispersing for 60min, weighing the SiO2 aerogel, magnetically stirring for 30min, thus obtaining a solution C; step 5. dropwise adding the solution A into the solution C, stirring for 4 hours, then transferring the obtained solution into a polytetrafluoroethylene tank, thus obtaining a solution D; and step 6. centrifugally separating the solution D, washing with deionized water and dehydrated alcohol, and carrying out ambient pressure drying. The composite positive electrode material obtained by the invention has high capacity and good cycle performance, and is an ideal lithium ion battery positive electrode material which has potential application prospect in the fields such as portable electronic devices, electric vehicles and aerospace.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a method for preparing an airgel / SnSb / carbon nanotube composite negative electrode material. Background technique [0002] With the development of microelectronics technology and new energy vehicles, high requirements are placed on power supplies. Lithium-ion batteries have become the focus of attention due to their high charging efficiency and high energy density. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, and electrolytes. Among them, the negative electrode material is mainly used as the main body of lithium storage, and it is a key part of the whole battery to realize the intercalation and extraction of lithium ions during the charging and discharging process. At present, the anodes of commercial lithium-ion batteries mainly use various carbon materials. The specific capacity of graph...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/38H01M4/62B82Y30/00
CPCB82Y30/00H01M4/364H01M4/625H01M10/0525Y02E60/10
Inventor 罗大为
Owner SHENZHEN POLYTECHNIC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap