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Preparation method of shell-core structure nano fiber for lithium battery cathode

A nanofiber and core structure technology, applied in the field of chemical materials, can solve problems such as complex production process, temperature, and oxygen concentration requirements

Inactive Publication Date: 2018-10-19
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been some successful examples to prove that this method is feasible, its production process is relatively complicated, usually by CVD to produce nanostructured silicon, which not only requires pressure, temperature, and oxygen concentration, but also requires additional catalysts or surfaces. active agent help

Method used

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  • Preparation method of shell-core structure nano fiber for lithium battery cathode
  • Preparation method of shell-core structure nano fiber for lithium battery cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a shell-core structure nanofiber for a lithium battery negative electrode, comprising the following steps:

[0023] (1) Dissolving silicon nanoparticles and PMMA in a mixed solution of DMF and acetone to form a precursor solution of the core structure of the composite fiber finally obtained. The mass concentration of silicon nanoparticles is 4%, and the mass concentration of PMMA is 9%. The precursor solution of the core structure was stirred and dispersed in an environment of 50° C. for 6 hours; the volume ratio of DMF and acetone in the mixed solution of DMF and acetone was 1:1.

[0024] (2) Dissolve PAN in DMF to form a shell-structured precursor solution in the final composite fiber with a mass concentration of 9%. The shell-structured precursor solution was stirred and dispersed at 70°C for 7h.

[0025] (3) The coaxial electrospinning parameters are as follows: the thickness ratio of the inner and outer layers of the coaxial needle is 1:1, th...

Embodiment 2

[0029] A method for preparing a shell-core structure nanofiber for a lithium battery negative electrode, comprising the following steps:

[0030] (1) Dissolving silicon nanoparticles and PMMA in a mixed solution of DMF and acetone to form a precursor solution for the core structure of the final composite fiber. The mass concentration of silicon nanoparticles is 5%, and the mass concentration of PMMA is 11%. The precursor solution of the core structure was stirred and dispersed at 55° C. for 7 hours; the volume ratio of DMF and acetone in the mixed solution of DMF and acetone was 1:1.

[0031] (2) Dissolve PAN in DMF to form a shell-structured precursor solution in the final composite fiber with a mass concentration of 12%; the shell-structured precursor solution was stirred and dispersed at 50°C for 6h.

[0032] (3) The coaxial electrospinning parameters are as follows: the thickness ratio of the inner and outer layers of the coaxial needle is 1:1, the liquid output ratio of t...

Embodiment 3

[0035] A method for preparing a shell-core structure nanofiber for a lithium battery negative electrode, comprising the following steps:

[0036] (1) Dissolving silicon nanoparticles and PMMA in a mixed solution of DMF and acetone to form a precursor solution for the core structure of the final composite fiber. The mass concentration of silicon nanoparticles is 6%, and the mass concentration of PMMA is 12%. The precursor solution of the core structure was stirred and dispersed at 60° C. for 8 hours; the volume ratio of DMF and acetone in the mixed solution of DMF and acetone was 1:1.

[0037] (2) Dissolve PAN in DMF to form a shell-structured precursor solution in the final composite fiber with a mass concentration of 11%. The shell-structured precursor solution was stirred and dispersed at 65°C for 7.5h.

[0038](3) The coaxial electrospinning parameters are as follows: the thickness ratio of the inner and outer layers of the coaxial needle is 1:1, the liquid output ratio of ...

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Abstract

The invention discloses a preparation method of a shell-core structure nano fiber for a lithium battery cathode. The preparation method comprises following steps: (1) dissolving silicon nano particlesand PMMA into a DMF-acetone mixed solution to obtain a precursor solution, which forms the core of the composite fiber; (2) dissolving PAN into DMF to form a precursor solution, which forms the shellof the composite fiber; and (3) preparing a composite nano fiber felt from the precursor solution (core) and the precursor solution (shell) according to parameters of electrostatic spinning, pre-oxidizing the felt for 1 to 2 hours at a temperature of 260-280 DEG C, and then carrying out carbonization for 3 to 6 hours under the protection of argon atmosphere at a temperature of 800-1000 DEG C. According to the preparation method, the precursor solution (core) and the precursor solution (shell) are prepared in advance, and then a coaxial electrostatic spinning technology is used to easily prepare the silicon-carbon composite material, which has good electrochemical properties, can be applied to a lithium ion battery anode material, and meets the use requirements.

Description

technical field [0001] The invention relates to the technology in the field of chemical materials, in particular to a method for preparing nanofibers with a shell-core structure for negative electrodes of lithium batteries. Background technique [0002] Due to its unprecedented theoretical capacity—4000mAh / g, which is almost ten times that of the existing commercial graphite anode—silicon has become the most promising anode material for lithium batteries. Its application prospects are more attractive in large-scale energy storage applications such as electric vehicles and utility grids, but silicon also has the disadvantage of short cycle life. [0003] The short cycle life of silicon is mainly rooted in its repeated volume expansion and contraction during cycling. When the volume of silicon changes, the decrease in its capacity is mainly due to the following failure mechanisms: first, the volume expansion of silicon can reach 300% when it is completely lithiated, and the p...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62B82Y40/00
CPCB82Y40/00H01M4/364H01M4/38H01M4/386H01M4/625Y02E60/10
Inventor 邱从交赵东辉周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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