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Preparation method and application of spherical tin sulfide consisting of nanorods

A nanorod-shaped, tin sulfide technology, applied in chemical instruments and methods, nanotechnology, inorganic chemistry, etc., can solve the problem of high irreversible capacity, achieve the effect of increasing lithium storage capacity, simple equipment, and reducing irreversible capacity

Inactive Publication Date: 2014-07-09
JINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the large volume change of existing tin sulfide in the charging and discharging process of lithium-ion batteries, the problem that the irreversible capacity is too high, the purpose of the present invention is to provide a kind of preparation method of nanorod-shaped spherical nano-tin sulfide

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  • Preparation method and application of spherical tin sulfide consisting of nanorods
  • Preparation method and application of spherical tin sulfide consisting of nanorods
  • Preparation method and application of spherical tin sulfide consisting of nanorods

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preparation example Construction

[0025] The invention provides a preparation method of a spherical tin sulfide negative electrode material composed of nanorods: after uniformly mixing a sulfur source, a tin source and a surfactant, heating the mixed solution by a hydrothermal method, filtering and drying the obtained product, and obtaining a nano Rod-shaped spherical tin sulfide lithium battery negative electrode material. Among them, polyvinylpyrrolidone (PVP) is used as the surfactant, thiourea is used as the sulfur source, and tin tetrachloride crystalline powder is used as the tin source.

[0026] In order to reduce the huge volume effect of tin sulfide, as well as the electrode pulverization or even peeling off from the current collector during the lithium-ion battery cycle, a method of reducing the size of tin sulfide can be adopted. Nanoization is an effective method to reduce the volume change. The 3D hierarchical structure formed by the self-assembly of nanostructures exhibits a large surface area, ...

Embodiment 1

[0031] The preparation method of spherical tin sulfide composed of nanorod-shaped lithium ion battery negative electrode material in this embodiment is specifically prepared according to the following steps:

[0032] 1) Weigh tin tetrachloride crystalline powder and thiourea according to the mass ratio of 1:4, and then weigh polyvinylpyrrolidone, whose mass ratio to tin tetrachloride crystalline powder is 1:1;

[0033] 2) Put the powder weighed in step 1) into deionized water, and stir until the powder is completely dissolved to obtain a uniform mixed solution;

[0034] 3) Transfer the homogeneous mixed solution obtained in step 2) into a stainless steel reaction kettle, and react at 160°C for 6 hours;

[0035] 4) After the product obtained in step 3) is filtered and cleaned, it is dried in a vacuum drying oven at 60° C. to obtain a spherical tin sulfide material composed of nanorods.

[0036] like figure 1 As shown in the scanning electron microscope (SEM) image of the tin ...

Embodiment 2

[0040] The preparation method of spherical tin sulfide composed of nanorod-shaped lithium-ion battery negative electrode material in this embodiment is specifically prepared according to the following steps:

[0041] 1) Weigh tin tetrachloride crystalline powder and thiourea according to the mass ratio of 1:2, and then weigh polyvinylpyrrolidone, whose mass ratio to tin tetrachloride crystalline powder is 1:2;

[0042] 2) Put the powder weighed in step 1) into deionized water, and stir until the powder is completely dissolved by magnetic stirring method to obtain a uniform mixed solution;

[0043] 3) Transfer the homogeneous mixed solution obtained in step 2) into a stainless steel reaction kettle, and react at 120°C for 6 hours;

[0044] 4) After the product obtained in step 3) is filtered and cleaned, it is dried in a vacuum drying oven at 60° C. to obtain a spherical tin sulfide material composed of nanorods.

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Abstract

The invention discloses a preparation method and application of spherical tin sulfide consisting of nanorods, belonging to the technical field of lithium ion battery materials. The invention further provides a preparation method of a negative electrode material. The method comprises the following steps: uniformly mixing a sulfur source, a tin source and a surfactant; heating a mixed solution by using a hydro-thermal method; filtering and drying the product to obtain a lithium battery negative electrode material of the spherical tin sulfide consisting of nanorods. Compared with spherical tin sulfide consisting of nanosheets, the spherical tin sulfide consisting of nanorods has the advantages that the cycle performance is improved, the stability of nanorods is higher than that of nanosheets in a circulating process, the volume change of an electrode material is suppressed effectively, the capacity fading of the electrode material is slowed down, and the cycle life of a battery is prolonged effectively.

Description

technical field [0001] The invention relates to a spherical tin sulfide composed of nanorods as a negative electrode material of lithium ion batteries, belonging to the field of lithium ion battery materials, and in particular to a preparation method and application of spherical tin sulfide composed of nanorods. Background technique [0002] With the rapid development of electronic technology, more and more industrialized products such as TVs, computers, mobile phones, new energy vehicles, etc. have entered people's daily life, greatly improving people's living conditions. However, with the ensuing global environmental pollution and energy depletion, the requirements for batteries with small size, light weight, long cycle life and high specific capacity are also getting higher and higher. Compared with other traditional energy storage batteries, lithium-ion batteries have a high energy density, which can reach 150-200Wh / kg, much higher than the 60-75Wh / Kg of Ni-MH batteries;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCB82Y40/00C01G19/00H01M4/5815H01M10/0525Y02E60/10
Inventor 孟辉张小雪谢方艳
Owner JINAN UNIVERSITY
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