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Lithium ion battery negative nanometer material SnO2/MCMB (Mesophase Carbon Micro Beads) shell, and preparation method and application thereof

A lithium ion battery and nanomaterial technology, which is applied in the field of lithium ion battery negative electrode nanomaterial SnO2/MCMB core-shell and its preparation, can solve the problems of cycle performance degradation, internal structure change, reduction of specific capacity, etc., and achieves improved cycle performance, The effect of improving performance and simple preparation process

Inactive Publication Date: 2013-08-07
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the single-structure SnO 2 material, along with Li + The intercalation and detachment will cause severe volume expansion and contraction, which will cause changes in the internal structure, thereby reducing the specific capacity and leading to attenuation of cycle performance.

Method used

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  • Lithium ion battery negative nanometer material SnO2/MCMB (Mesophase Carbon Micro Beads) shell, and preparation method and application thereof
  • Lithium ion battery negative nanometer material SnO2/MCMB (Mesophase Carbon Micro Beads) shell, and preparation method and application thereof
  • Lithium ion battery negative nanometer material SnO2/MCMB (Mesophase Carbon Micro Beads) shell, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Mix 25mL of 98wt% concentrated sulfuric acid and 75mL of 60wt% concentrated nitric acid to obtain a mixed acid; disperse 2g of MCMB (5-12 microns) in the mixed acid, reflux at 50°C for 10h, then add 10mL of 35wt% H 2 o 2 , continue to stir for 5 hours, then centrifuge three times with deionized water and ethanol, collect the precipitate, and dry it in vacuum at 80°C for 5 hours to obtain pretreated MCMB;

[0058] (2) Ultrasonic disperse 0.5 g of pretreated MCMB from step (1) in 100 mL of deionized water, and take 5.21 g of SnCl 4 As a tin source, make the molar concentration ratio of tin atoms 0.2mol / L, add 25wt% ammonia water dropwise until the pH of the solution is 7, stir for 2h, centrifuge three times with deionized water and ethanol successively, collect the precipitate, and vacuum dry at 90°C 8h, get Pre-MCMB-SnO 2 ;

[0059] (3) Add 0.6g of Pre-MCMB-SnO from step (2) 2 , 2.13g sodium stannate and 0.32g sodium hydroxide are added to 40mL mixed solution (de...

Embodiment 2

[0063] (1) Mix 25mL of 98wt% concentrated sulfuric acid and 75mL of 60wt% concentrated nitric acid to obtain a mixed acid; disperse 2g of MCMB (5-12 microns) in the mixed acid, reflux at 50°C for 11h, and then add 15mL of 30wt% H 2 o 2 , continue to stir for 5 hours, then centrifuge three times with deionized water and ethanol, collect the precipitate, and dry it in vacuum at 80°C for 5 hours to obtain pretreated MCMB;

[0064] (2) Ultrasonic disperse 0.5 g of pretreated MCMB from step (1) in 100 mL of deionized water, and take 6.51 g of SnCl 4 As a tin source, make the molar concentration ratio of tin atoms 0.25mol / L, add 30wt% ammonia water dropwise until the pH of the solution is 8, stir for 2h, centrifuge three times with deionized water and ethanol successively, collect the precipitate, and dry it under vacuum at 80°C 12h, get Pre-MCMB-SnO 2 ;

[0065] (3) Add 0.6g of Pre-MCMB-SnO from step (2) 2 , 2.66g sodium stannate and 0.48g sodium hydroxide are added to 40mL mix...

Embodiment 3

[0069] (1) Mix 25mL of 98wt% concentrated sulfuric acid and 75mL of 60wt% concentrated nitric acid to obtain a mixed acid; disperse 2g of MCMB (5-12 microns) in the mixed acid, reflux at 50°C for 12h, then add 20mL of 32wt% H 2 o 2 , continue to stir for 5 hours, then centrifuge three times with deionized water and ethanol, collect the precipitate, and dry it in vacuum at 80°C for 5 hours to obtain pretreated MCMB;

[0070] (2) Ultrasonic disperse 0.5 g of pretreated MCMB from step (1) in 100 mL of deionized water, and take 7.81 g of SnCl 4 As a tin source, make the molar concentration ratio of tin atoms 0.3mol / L, add 35wt% ammonia water dropwise until the pH of the solution is 8, stir for 2h, centrifuge three times with deionized water and ethanol successively, collect the precipitate, and dry it under vacuum at 60°C 24h, get Pre-MCMB-SnO 2 ;

[0071] (3) Add 0.6g of Pre-MCMB-SnO from step (2) 2 , 3.2g sodium stannate and 0.64g sodium hydroxide are added to 40mL mixed sol...

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Abstract

The invention discloses a lithium ion battery negative nanometer material SnO2 / MCMB (Mesophase Carbon Micro Beads) shell, and a preparation method and application of the shell. The SnO2 / MCMB shell is prepared by reacting reactants in a mixed solution of deionized water and absolute ethyl alcohol at the volume ratio of 1:1 for 24-48 hours at 160-200 DEG C. By controlling the ratio, the reaction temperature and the reaction time of the reaction solvents, the structure, the size and the feature of the product are improved, the material performance is improved, and the first charge-discharge efficiency, the specific capacity and the cycle performance of the SnO2 / MCMB shell are improved. A shell structure is adopted, the cycle stability of carbon and an effect of alleviating volume expansion of tin-based oxide with rod-shaped nanometer SnO2 are effectively combined, and the problems that tin-based oxide is low in first efficiency, large in irreversible capacity loss and poor in conductivity performance when tin-based oxide is used for preparing a lithium ion battery negative material are solved. The preparation method is simple in preparation technology and low in cost, and can be applied to industrial production.

Description

technical field [0001] The invention belongs to the field of battery material preparation, in particular to a lithium-ion battery negative electrode nano-material SnO 2 / MCMB core-shell and its preparation method and application. Background technique [0002] With the continuous development of science and technology and more and more serious environmental pollution, the development of new green energy is imminent. Among the latest developments of popular renewable energy, lithium-ion batteries have high specific capacity, small self-discharge, long cycle life, and low weight. The advantages of light and green environmental protection become an ideal choice. Electrode materials are the key factors that determine the overall performance of lithium-ion batteries. As for anode materials, the current commercial carbon anode materials are close to their theoretical limit capacity (372mAh / g), which severely limits the capacity of high-capacity lithium-ion batteries. Further devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 汝强张贝贝宋雄侯贤华
Owner SOUTH CHINA NORMAL UNIVERSITY
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