Iron-containing oxide coated sulfur-doped expanded graphite/silicon electrode material and preparation method thereof

A technology of expanded graphite and electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of easy exposure, large volume of silicon carbon particles and silicon atoms, and achieve enhanced lithium storage capacity, inhibition of volume expansion, and unique electrical properties. Effects of chemical properties

Pending Publication Date: 2022-07-08
BINZHOU YUNENG CHEM
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  • Application Information

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Problems solved by technology

However, the improvement effect of simply using expanded graphite is not obvious. Since the silicon atoms of silicon carbon particles are large in volume, they are easily exposed. Therefore, the present invention proposes a new strategy to improve the applicability of silicon and the stability of the entire electrode structure. , using a simple manufacturing process, designed a method that can effectively reduce the risk of nano-silicon exposure, using the volume advantage of sulfur atoms to reduce the impact of conductive ions on the surface of reduced graphite oxide, and using the excellent properties of ferrocene and cobalt Electrochemical properties, redox characteristics, etc. enhance the lithium storage capacity, cycle and rate performance of the composite electrode, and form a new electrode structure. The results show that the electrode shows good stability under high current load

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  • Iron-containing oxide coated sulfur-doped expanded graphite/silicon electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] This embodiment provides an iron oxide-coated sulfur-doped expanded graphite / silicon electrode material, and the preparation process specifically includes the following steps:

[0038] (1) Mix and grind 100 mg of ferrocene and 100 mg of expandable graphite for 15 minutes, stir evenly, and heat and expand at a high temperature of 1200 °C in a high-temperature expansion furnace for 0.5 h to obtain expanded graphite coated with iron oxide;

[0039] (2) Weigh 100 mg of thiourea and 100 mg of the iron oxide-coated expanded graphite obtained in step (1), grind them uniformly with a mortar, and transfer them into a ceramic boat, then put them into a tube furnace, and vacuumize them. Filled with argon gas at an atmospheric pressure for protection, and heated in a closed tube furnace until the temperature in the furnace reached 1000 ° C and then kept for 30 minutes, and then cooled to room temperature with the furnace to obtain iron oxide-coated sulfur-doped expanded graphite;

...

Embodiment 2

[0045] The content of an iron oxide-coated sulfur-doped expanded graphite / silicon electrode material is basically the same as that of Example 1, except that 30 mg of nano-silicon is added in the preparation step (2), and 70 mg of the electrode material obtained in the step (2) is added. In the iron oxide-coated sulfur-doped expanded graphite, the nano-silicon accounts for 30 wt % of the mass sum of both the nano-silicon and the iron oxide-coated sulfur-doped expanded graphite.

[0046] The content of an electrode sheet is basically the same as that of Embodiment 1, except that the electrode material attached to the conductive copper foil substrate is the iron oxide-coated sulfur-doped expanded graphite prepared by the above preparation method of this embodiment. / Silicon electrode material.

[0047] The content of a lithium ion battery is basically the same as that of Example 1, except that the negative electrode is the electrode sheet prepared in this example.

Embodiment 3

[0049] The content of an iron oxide-coated sulfur-doped expanded graphite / silicon electrode material is basically the same as that of Example 1, except that 70 mg of nano-silicon is added in the preparation step (2), and 30 mg of the electrode material obtained in the step (2) is added. In the iron oxide-coated sulfur-doped expanded graphite, the nano-silicon accounts for 70 wt % of the sum of the mass of the nano-silicon and the iron oxide-coated sulfur-doped expanded graphite.

[0050] The content of an electrode sheet is basically the same as that of Embodiment 1, except that the electrode material attached to the conductive copper foil substrate is the iron oxide-coated sulfur-doped expanded graphite prepared by the above preparation method of this embodiment. / Silicon electrode material.

[0051] The content of a lithium ion battery is basically the same as that of Example 1, except that the negative electrode is the electrode sheet prepared in this example.

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Abstract

The invention belongs to the technical field of lithium ion battery composite electrode materials, and discloses an iron-containing oxide-coated sulfur-doped expanded graphite/silicon electrode material, and a preparation method thereof comprises the following steps: uniformly mixing an iron-containing oxide precursor and expandable graphite, carrying out puffing treatment, and carrying out heat treatment with a sulfur-containing compound to obtain the iron-containing oxide-coated sulfur-doped expanded graphite/silicon electrode material. The sulfur-doped expanded graphite coated with the iron-containing oxide is obtained; adding the sulfur-doped expanded graphite coated with the iron-containing oxide, nano silicon and a binder into a dispersing agent, and uniformly dispersing to obtain dispersed slurry; and drying the dispersed slurry to obtain the iron-containing oxide coated sulfur-doped expanded graphite/silicon electrode material. The composite electrode material prepared by the invention has the characteristics of high conductivity, high capacity and high stability, and is suitable for being used as an electrode material of a battery.

Description

technical field [0001] The invention relates to the technical field of composite electrode materials for lithium ion batteries, in particular to an iron-containing oxide-coated sulfur-doped expanded graphite / silicon electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of large discharge voltage, large battery capacity, less self-discharge, no memory effect, and environmental protection. Lithium-ion batteries, which are lighter in weight, last longer, and charge more efficiently than older types of batteries, are now an ideal power source for many devices such as computers, mobile phones, and tablets, and others such as new energy vehicles, aerospace, Rockets, artificial satellites and other fields are also inextricably linked with the application of lithium batteries. [0003] As far as anode materials are concerned, although commercial graphite-based anode materials have good electrical conductivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/483H01M4/583H01M4/386H01M4/38H01M10/0525H01M2004/027Y02E60/10
Inventor 高志杰宋彦磊王壮马树凤卢文娟
Owner BINZHOU YUNENG CHEM
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