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A kind of preparation method of lithium battery negative electrode material

A negative electrode material, lithium battery technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of no coaxial structure, no hollow structure, etc., and achieve the effect of good cycle stability

Inactive Publication Date: 2019-02-19
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Search papers and patents found that the patent CN101792935A discloses an alumina / tin oxide blended nanofiber membrane and its preparation method. Although the tin oxide and alumina mentioned in the patent are prepared by electrospinning, the two The one belongs to the blend structure, does not have a coaxial structure, and does not contain a hollow structure; the paper "Carbon-coated nano-SnO 2 Preparation and Capacitance of Hollow Fibers" (Acta Physicochemical Society, 2015) published a hollow SnO 2 The preparation and performance of the fiber. Although the hollow structure is prepared by coaxial electrospinning, the hollow structure belongs to SnO 2 "Inner hollow", and SnO in the fiber prepared by the present invention 2 The outer layer is a hollow structure, that is, carbon layer and SnO 2 There is a gap structure between the particles. In addition, the raw materials, steps and synthesis principles used in the patented preparation method are also quite different from those of the present invention.

Method used

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  • A kind of preparation method of lithium battery negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] SnCl 4 , silica sol, polyvinylidene fluoride by mass ratio m SnCl4 :m 硅溶胶 :m 聚偏氟乙烯 =1:0.4:1.1 Dissolved in ethanol solution, configured as an inner spinning solution with a solid content of 43.2%; dissolved polyvinylpyrrolidone powder in an ethanol solution, configured as an outer spinning solution with a solid content of 18.1%; Put the inner layer spinning solution in the inner layer injector of the coaxial electrospinning equipment, put the outer layer spinning solution in the outer layer injector, and carry out electrospinning according to the parameters of voltage 19kV and receiving distance 26cm, and the same Shaft fiber precursor; sinter the fiber precursor in nitrogen at 750°C for 3 hours to obtain SnO 2 @ / SiO 2 @ / C Composite fiber; soak the composite fiber in 18% HF solution for 20 minutes, wash it repeatedly, and dry it at 100°C for 3 hours to obtain hollow SnO 2 @C nanofibers.

Embodiment 2

[0022] SnCl 4 , silica sol, polyvinylidene fluoride by mass ratio m SnCl4 :m 硅溶胶 :m 聚偏氟乙烯 =1:0.84:1.7 dissolved in ethanol solution, configured as an inner spinning solution with a solid content of 30%; dissolving polyvinylpyrrolidone powder in an ethanol solution, configured as an outer spinning solution with a solid content of 12%; Put the inner layer spinning solution in the inner layer syringe of the coaxial electrospinning equipment, put the outer layer spinning solution in the outer layer syringe, and carry out electrospinning according to the parameters of voltage 16kV and receiving distance 20cm, and the same Shaft fiber precursor; sinter the fiber precursor in nitrogen at 650°C for 5 hours to obtain SnO 2 @ / SiO 2 @ / C Composite fiber; soak the composite fiber in 11% HF solution for 25 minutes, wash it repeatedly, and dry it at 100°C for 5 hours to obtain hollow SnO 2 @C nanofibers.

Embodiment 3

[0024] SnCl 4 , silica sol, polyvinylidene fluoride by mass ratio m SnCl4 :m 硅溶胶 :m 聚偏氟乙烯 =1:2:1.8 dissolved in ethanol solution, configured as an inner spinning solution with a solid content of 28.5%; dissolving polyvinylpyrrolidone powder in an ethanol solution, configured as an outer spinning solution with a solid content of 8.8%; Put the inner layer spinning solution in the inner layer injector of the coaxial electrospinning equipment, put the outer layer spinning solution in the outer layer injector, and carry out electrospinning according to the parameters of voltage 15kV and receiving distance 15cm, and the same Shaft fiber precursor; sinter the fiber precursor in nitrogen at 600°C for 6 hours to obtain SnO 2 @ / SiO 2 @ / C composite fiber; soak the composite fiber in 5% HF solution for 45 minutes, wash it repeatedly, and dry it at 100°C for 10 hours to obtain hollow SnO 2 @C nanofibers.

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Abstract

The invention relates to a preparation method of a lithium battery anode material. A SnO2@ / C composite material which contains fibers and adopts a hollow structure can be prepared with the method, SnO2 has enough buffering space in the charging and discharging process due to the fibers adopting the hollow structure, a C outer layer can serve as a network framework of SnO2, efflorescence of the material is reduced, the conductivity of the material is improved, the one-step method for preparation of SnO2@ / SiO2@ / C composite fibers is not as complicated as a traditional method in which fibers are coated after being prepared, and the SnO2@C nanofibers prepared with the method have good cyclic stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for preparing negative electrode materials of lithium-ion batteries. Background technique [0002] With the rapid development of products such as mobile phones, 3C electronics and new energy vehicles, lithium-ion battery (an energy storage and conversion device) technology has also made great progress. However, due to the continuous improvement of people's living standards, the requirements for lithium-ion batteries are also getting higher and higher, and the existing lithium battery technology can no longer meet the demand. For example, the highest energy density of a lithium battery system composed of traditional positive electrode materials (lithium cobaltate, lithium manganese oxide, and lithium iron phosphate) and negative electrode materials (graphite) is only 200Wh / kg, which is not enough for a large energy density. The use time and mile...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/18D01F11/00H01M4/36H01M4/48H01M4/62H01M10/0525
CPCD01F8/18D01F11/00H01M4/366H01M4/48H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 屈超群徐仕翀李海波
Owner JILIN NORMAL UNIV
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