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Preparation method of carbon-coated tin dioxide superfine powder lithium ion battery negative electrode material

A lithium-ion battery, tin dioxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of tin dioxide negative electrode capacity, high current discharge capacity, etc., to achieve easy amplification of experimental dose, good high current charge and discharge The effect of stable performance and structure

Inactive Publication Date: 2015-07-01
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the volume of the tin dioxide negative electrode material changes greatly during the process of deintercalating lithium, which leads to the rapid attenuation of the capacity of the tin dioxide negative electrode and poor high-current discharge capacity. Ion batteries have limitations

Method used

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  • Preparation method of carbon-coated tin dioxide superfine powder lithium ion battery negative electrode material
  • Preparation method of carbon-coated tin dioxide superfine powder lithium ion battery negative electrode material
  • Preparation method of carbon-coated tin dioxide superfine powder lithium ion battery negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Mix 0.18g of freshly prepared tin hydroxide hydrate, 2.6ml of oleic acid (OA), 1.0ml of oleylamine (OLA) and 10ml of octadecene (ODE), and vacuumize (0.05mbar) for 30 minutes at room temperature, Heating to 100°C, and then vacuuming for 30 minutes to remove low-boiling impurities; under nitrogen atmosphere, raise the temperature of the reaction solution to 280°C, and then continuously blow air into the reaction solution for 1.5 hours to obtain tin dioxide nanocrystals solution with an air flow rate of 3-4 cm 3 / s;

[0031] 2) Lower the tin dioxide nanocrystal solution to normal temperature, add methanol or isopropanol to precipitate, filter, wash and vacuum dry at 60°C to obtain tin dioxide nanocrystals, and the filtrate is subjected to atmospheric pressure and vacuum fractional distillation for recycling and recycling ;

[0032] 3) Calcining the tin dioxide nanocrystals in a nitrogen atmosphere at 400-600° C. for 3 hours to obtain a carbon-coated tin dioxide powde...

Embodiment 2

[0034] 1) Mix 0.18g of freshly prepared tin hydroxide hydrate, 2.6ml of oleic acid (OA), 1.0ml of oleylamine (OLA) and 10ml of octadecene (ODE), and vacuumize (0.05mbar) for 30 minutes at room temperature, Heating to 100°C, and then evacuating for 30 minutes to remove low-boiling impurities; under a nitrogen atmosphere, raise the temperature of the reaction solution to 250°C, and then continuously blow air into the reaction solution for 1.5 hours to obtain tin dioxide nanocrystals solution with an air flow rate of 3-4 cm 3 / s;

[0035] 2) Lower the tin dioxide nanocrystal solution to normal temperature, add methanol or isopropanol to precipitate, filter, wash and vacuum dry at 60°C to obtain tin dioxide nanocrystals, and the filtrate is subjected to atmospheric pressure and vacuum fractional distillation for recycling and recycling ;

[0036] 3) Calcining the tin dioxide nanocrystals in a nitrogen atmosphere at 600° C. for 3 hours to obtain a carbon-coated tin dioxide powder...

Embodiment 3

[0038] 1) Mix 0.18g of freshly prepared tin hydroxide hydrate, 2.6ml of oleic acid (OA), 1.0ml of oleylamine (OLA) and 10ml of octadecene (ODE), and vacuumize (0.05mbar) for 30 minutes at room temperature, Heat to 100°C, then vacuum for 30 minutes to remove low-boiling impurities; under nitrogen atmosphere, raise the temperature of the reaction solution to 280°C, and then continuously blow air into the reaction solution for 45 minutes to obtain a tin dioxide nanocrystal solution , the air velocity is 3-4cm 3 / s;

[0039] 2) Lower the tin dioxide nanocrystal solution to normal temperature, add methanol or isopropanol to precipitate, filter, wash and vacuum dry at 60°C to obtain tin dioxide nanocrystals, and the filtrate is subjected to atmospheric pressure and vacuum fractional distillation for recycling and recycling ;

[0040] 3) Calcining the tin dioxide nanocrystals in a nitrogen atmosphere at 600° C. for 3 hours to obtain a carbon-coated tin dioxide powder with a size of...

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Abstract

The invention discloses a preparation method of a carbon-coated tin dioxide superfine powder lithium ion battery negative electrode material. The preparation method comprises the following steps of: dissolving the precursor of tin and long-chain fatty acid in a high boiling point solvent under certain condition; continuously blowing in air at 200 DEG C-280 DEG C to prepare a tin dioxide nanocrystal which is high in degree of crystallinity and monodisperse; and recycling, purifying, roasting in a nitrogen gas atmosphere to obtain carbon-coated tin dioxide superfine powder. According to the preparation method disclosed by the invention, dimension of the carbon-coated tin dioxide superfine powder can be adjusted by controlling factors of reaction temperature, time, and the like. The carbon-coated tin dioxide superfine powder prepared by the preparation method disclosed by the invention has characteristics of high capacity (as high as 1000 mAh.g<-1>), stable capacity (battery capacity of 480 mAh.g<-1> during 8C discharging) under high-rate discharge condition, and the like.

Description

1. Technical field [0001] The invention relates to a preparation method of a battery negative electrode material, in particular to a preparation method of a carbon-coated tin dioxide ultrafine powder lithium ion battery negative electrode material. 2. Background technology [0002] Tin dioxide is an important anode material for lithium-ion batteries. Due to the high theoretical capacity of tin dioxide (782mAh g -1 ), is the theoretical capacity of commercial carbon anode materials (372mAh g -1 ), compared with other oxide semiconductor materials, it has high electrical conductivity (~21.1Ω cm) and high electron mobility (~100-200cm 2 ·V -1 ·s -1 ), which has great potential application value in high-performance lithium-ion batteries, especially power lithium-ion batteries. Due to the quantum size effect of nano-tin dioxide, large specific surface area and high surface activity, nano-tin dioxide materials such as tin dioxide nanoparticles, tin dioxide nanowires, and meso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/38
CPCH01M4/483H01M4/628Y02E60/10
Inventor 苗世顶丁丽平何淑莲陈德超叶伟杨婷
Owner HEFEI UNIV OF TECH
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