Carbon-tin nano composite material as well as preparation method and application thereof

A nano-composite material and composite material technology, applied in the field of carbon-tin nano-composite materials and their preparation, can solve the problems of unresistable macroscopic mechanical properties, limited commercialization, easy cracking and crushing of electrodes, etc., and achieve the suppression of volume expansion effect , Improve electrical conductivity, improve the effect of cycle stability

Active Publication Date: 2022-06-07
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure tin, as the negative electrode material of lithium-ion batteries, undergoes a great change in volume during the alloying / dealloying process, and tin itself is a ductile material, and its macroscopic mechanical properties make it unable to resist the resulting Due to the stress of the electrode, the electrode is prone to cracking and crushing, which greatly limits its commercialization.

Method used

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  • Carbon-tin nano composite material as well as preparation method and application thereof
  • Carbon-tin nano composite material as well as preparation method and application thereof
  • Carbon-tin nano composite material as well as preparation method and application thereof

Examples

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preparation example Construction

[0024] The invention provides a preparation method of carbon-tin nanocomposite material, comprising the following steps:

[0025] (1) mixing tin tetrachloride pentahydrate solution with helical carbon nanofiber dispersion liquid to carry out hydrolysis reaction to obtain tin dioxide / helical carbon nanofiber composite material;

[0026] (2) reducing the tin dioxide / spiral carbon nanofiber composite material obtained in the step (1) to obtain a tin / spiral nanocarbon fiber composite material;

[0027] (3) carbon coating is performed on the surface of the tin / spiral carbon nanofiber composite material obtained in the step (2) by a vapor deposition method to obtain a carbon-tin nanocomposite material.

[0028] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in the field.

[0029] In the invention, the tin tetrachloride pentahydrate solution is mixed with the helical nano carbon fiber dispersion liquid to...

Embodiment 1

[0055] Preparation method of carbon tin nanocomposite

[0056] (1) The tin tetrachloride pentahydrate solution was added dropwise to the helical carbon nanofiber dispersion at a rate of 0.5 mL / min. After the dropwise addition, the hydrolysis reaction was carried out at 80 °C for 3 h, and the product of the hydrolysis reaction was filtered by vacuum suction. , and dried at 80°C for 12 hours to obtain a tin dioxide / spiral carbon nanofiber composite material; the mass ratio of tin tetrachloride pentahydrate in the tin tetrachloride pentahydrate solution to the spiral nanocarbon fiber in the spiral nanocarbon fiber dispersion liquid is: 3:1;

[0057] The preparation method of the tin tetrachloride pentahydrate solution is as follows: at room temperature, weigh 0.3 g of tin tetrachloride pentahydrate in a 50 mL beaker, measure 50 mL of deionized water and mix with tin tetrachloride pentahydrate ultrasonically for 10 min. ;

[0058] The preparation method of the helical carbon nan...

Embodiment 2

[0066] The carbon-tin nanocomposite was prepared according to the method of Example 1 and named C / Sn / HCNFs-0.13;

[0067] The difference from Example 1 is that 0.4g of tin tetrachloride pentahydrate is weighed when preparing the tin tetrachloride pentahydrate solution in the step (1).

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Abstract

According to the carbon tin nano composite material and the preparation method and application thereof, the conductivity of the composite material is improved by utilizing a three-dimensional network structure formed by spiral nano carbon fibers, and network gaps of the structure provide a buffer space for expansion of tin nano particles grafted on the surfaces of the fibers, so that the conductivity of the carbon tin nano composite material is improved. The volume expansion effect of tin is inhibited, tin nanoparticles with small particle size and uniform distribution are generated by utilizing a sol-gel method and a reduction reaction and are uniformly grafted to the surface of the fiber, the volume expansion effect of tin is reduced by nanocrystallization of tin, the cycling stability of the composite material is improved, and a carbon coating layer is formed by a vapor deposition method, so that the composite material is prepared. According to the invention, tin nanoparticles are used as an intermediate layer and cooperate with HCNFs and a carbon coating layer to form a sandwich structure, so that the volume expansion effect of tin is effectively inhibited, the cycling stability and the capacity rate are improved, and the specific capacity can reach 503.9 mAh / g under the current density of 200mA / g and the cycle index is 200.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a carbon-tin nanocomposite material and a preparation method and application thereof. Background technique [0002] Emerging electric vehicles, portable devices, newly launched space exploration equipment, and modern military equipment are all inseparable from efficient and safe energy storage devices. However, traditional lead-acid batteries and nickel-metal hydride batteries are difficult to meet the higher energy storage needs of modernization. Li-ion secondary batteries have become a research hotspot because of their large specific capacity, high voltage and long cycle life. Moreover, the negative electrode material is one of the key factors that determine the performance of lithium-ion batteries, accounting for about 30% of the battery cost. [0003] In 1997, Yoshio Idato first reported Sn-based oxides as anode materials for lithium-ion batteries. Tin has a lithium intercalati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62
CPCH01M4/625H01M4/387H01M4/48H01M4/366Y02E60/10
Inventor 金永中陈戈李旭陈建张闻君邓瑶李佩雯
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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