Preparation method and application of FeS[x]/C/CNT composite cathode materials

A technology of negative electrode material and composite material, which is applied in the fields of material synthesis and chemical power supply, can solve the problems of the utilization rate of active materials and the deterioration of cycle performance, and achieve the effects of excellent cycle performance, improved utilization rate, and good sulfur-fixing ability.

Inactive Publication Date: 2019-04-05
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] FeS x As a transition metal sulfide lithium-ion battery negative electrode, due to the multi-electron electrochemical reaction involved in the charging and discharging process, the theoretical mass specific capacity and theoretical mass specific energy are high, but FeS x During the charge-discharge cycle, there are problems such as volume expansion and dissolution of polysulfide intermediates, which lead to poor utilization of active materials and cycle performance

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  • Preparation method and application of FeS[x]/C/CNT composite cathode materials
  • Preparation method and application of FeS[x]/C/CNT composite cathode materials
  • Preparation method and application of FeS[x]/C/CNT composite cathode materials

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Embodiment 1

[0023] Embodiment 1: a kind of FeS x The preparation method of / C / CNT composite negative electrode material, concrete steps are as follows:

[0024] (1) Dissolve iron source (ferrous sulfate) into deionized water, then add carbon source (glucose) and carbon nanotubes and mix well, then add sulfur source (sodium thiosulfate), dissolve and spray dry to obtain FeS x / C / CNT composite material precursor; wherein the molar ratio of iron source (ferrous sulfate) to sulfur source (sodium thiosulfate) is 1:1, the mass of carbon source (glucose) g:iron source (ferrous sulfate) The molar ratio of the molar mass is 0.8:0.01, the mass g of carbon nanotubes: the molar ratio of the iron source (ferrous sulfate) is 0.4:0.01; the inlet temperature of the spray drying is 200°C, and the outlet temperature is 130°C ;

[0025] (2) Incorporate step (1) FeS x / C / CNT composite material precursor was calcined at 500 °C in an inert gas (argon) atmosphere for 5 h, cooled with the furnace, washed with...

Embodiment 2

[0030] Embodiment 2: present embodiment FeS x / C / CNT composite negative electrode material preparation method and embodiment 1FeS xThe preparation method of / C / CNT composite negative electrode material is basically the same, and the difference is that the carbon source is sodium carboxymethyl cellulose, and the mass g of the carbon source (sodium carboxymethyl cellulose): the mass g of the iron source (ferrous sulfate) The molar ratio of mol is 0.8:0.01; the inlet temperature of spray drying is 220 °C, and the outlet temperature is 150 °C;

[0031] The electrochemical performance testing method of this embodiment is the same as that of Example 1. From the present embodiment FeS x / C / CNT composite charge-discharge curve shows that the discharge platform is 1.7 V, and the discharge platform is almost unchanged during the cycle; from the example of FeS x Charge-discharge cycle diagram of / C / CNT composite; FeS x / C / CNT composite charge-discharge cycle at 200 mA / g current densit...

Embodiment 3

[0032] Embodiment 3: present embodiment FeS x / C / CNT composite negative electrode material preparation method and embodiment 1FeS x The preparation method of / C / CNT composite negative electrode material is basically the same, the difference is that the carbon source is soluble starch, and the ratio of the mass g of carbon source (soluble starch): the molar quantity mol of iron source (ferrous sulfate) is 0.6: 0.01; the inlet temperature of spray drying is 180°C, and the outlet temperature is 120°C;

[0033] The electrochemical performance testing method of this embodiment is the same as that of Example 1. From the present embodiment FeS x / C / CNT composite charge-discharge curve shows that the discharge platform is 1.7 V, and the discharge platform is almost unchanged during the cycle; from the example of FeS x Charge-discharge cycle diagram of / C / CNT composite; FeS x / C / CNT composite charge-discharge cycle at 200 mA / g current density, as FeS x / C / CNT composite material, th...

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Abstract

The invention discloses a preparation method and application of FeS[x]/C/CNT composite cathode materials, and belongs to the field of material synthesis and chemical power supplies. According to the invention , an iron source is dissolved into deionized water, and then a carbon source and carbon nanotubes are added in the deionized water and mixed uniformly; afterwards, a sulfur source is added and dissolved in the mixture and the mixture undergoes spray-drying to obtain a FeS[x]/C/CNT composite precursor; the FeS[x]/C/CNT composite material precursor is calcined at a temperature of 500-600 DEG C under an inert gas atmosphere for 5-8 hours, cooled with a furnace, washed with the deionized water, and then undergoes vacuum drying to obtain FeS[x]/C/CNT composite cathode materials. The FeS[x]/C/CNT composite cathode materials of the invention can be used for a lithium battery cathodes, have high specific capacity and excellent cycle stability, and if the cathode materials are charged anddischarged repeatedly at a current density of 200 mA/g at room temperature, the cathode materials have a specific discharge capacity of 630 mAh/g and a Coulomb efficiency of 99% according to FeS[x]/C/CNT composite materials.

Description

technical field [0001] The present invention relates to a kind of FeS x The preparation method and application of / C / CNT composite negative electrode material belong to the field of material synthesis and chemical power supply. Background technique [0002] Lithium-ion batteries are high-energy-density, high-efficiency electrical energy storage devices that have been widely used in small mobile electronic devices. Like other battery systems, lithium-ion batteries are mainly composed of four key materials: negative electrode materials, positive electrode materials, separators and electrolytes. The properties of materials have a very important relationship with the performance of lithium-ion batteries. [0003] Lithium-ion battery anode materials are compounds that can reversibly intercalate-deintercalate lithium ions, such as layered graphite, transition metal sulfide, etc. [0004] FeS x As a transition metal sulfide lithium-ion battery negative electrode, due to the mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5815H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 张英杰张义永李雪董鹏黎永泰
Owner KUNMING UNIV OF SCI & TECH
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