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Graphene-coated lithium battery anode material and preparation method thereof

A graphene-coated, positive electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as inability to effectively suppress polysulfide compounds, material conductivity needs to be improved, and preparation methods are required to be high. Electrochemical properties, the effect of reducing fabrication cost, and improving cycle performance

Inactive Publication Date: 2018-11-13
SHANGQIU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the general hydrothermal method, the preparation process is relatively complicated and requires higher preparation methods
[0006] Shouchuan Li and Gang Li also prepared Cu by hydrothermal method 2 S nano-flower flakes, but when the prepared flakes are applied in lithium-ion batteries, there will be some incompletely reacted sulfur elements, which cannot effectively inhibit the formation of polysulfide compounds. In addition, the conductivity of the material needs to be improved.

Method used

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  • Graphene-coated lithium battery anode material and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of a graphene-coated lithium battery cathode material, comprising the following steps:

[0032] (1) 0.3g cuprous chloride, 0.4g thiourea and 0.05g polyvinylpyrrolidone (PVP) are dissolved in the ethanol of 95% (v / v), make precursor solution, prepare precursor solution according to reaction kettle volume 60 The amount of % is added in the reactor;

[0033] (2) Add 10 mg of graphene oxide to the reaction kettle, stir for 20 minutes, and mix the precursor liquid and graphene oxide evenly;

[0034] (3) After sealing the reaction kettle, put it into a blast drying oven, heat it at 120°C for 5h, wash it with absolute ethanol three times, then wash it with deionized water three times, and dry it under vacuum at 60°C for 6h;

[0035] (4) After dissolving the product of step (3) with carbon disulfide, centrifuge three times with absolute ethanol, then centrifuge three times with deionized water, vacuum dry at 60°C for 6h, and sinter at 300°C for 20h in an a...

Embodiment 2

[0039] A preparation method of a graphene-coated lithium battery cathode material, comprising the following steps:

[0040] (1) Dissolve 0.5g cuprous chloride, 0.4g thiourea and 0.8g PVP in ethanol of 95% (v / v) to prepare a precursor solution, and add the precursor solution according to 80% of the volume of the reactor to react in the kettle

[0041] (2) Add 20 mg graphene oxide to the reaction kettle, stir for 60 min, and mix the precursor liquid and graphene oxide evenly;

[0042] (3) After sealing the reaction kettle, put it into a blast drying oven, heat it at 180°C for 24h, wash it with absolute ethanol three times, then wash it with deionized water three times, and vacuum dry it at 100°C for 12h;

[0043] (4) After dissolving the product of step (3) with carbon disulfide, centrifuge three times with absolute ethanol, then centrifuge three times with deionized water, vacuum dry at 100°C for 12h, and sinter at 800°C for 5h in an argon atmosphere to obtain Graphene-coated...

Embodiment 3

[0047]A preparation method of a graphene-coated lithium battery cathode material, comprising the following steps:

[0048] (1) Dissolve 0.5g cuprous chloride, 0.4g thiourea and 0.4g PVP in ethanol of 95% (v / v) to prepare a precursor solution, and add the precursor solution according to 70% of the volume of the reaction kettle to react in the kettle

[0049] (2) Add 100 mg of graphene oxide to the reaction kettle, stir for 30 minutes, and mix the precursor liquid and graphene oxide evenly;

[0050] (3) After sealing the reaction kettle, put it into a blast drying oven, heat it at 180°C for 12h, wash it with absolute ethanol three times, then wash it with deionized water three times, and vacuum dry it at 100°C for 10h;

[0051] (4) After dissolving the product of step (3) with carbon disulfide, centrifuge three times with absolute ethanol, then centrifuge three times with deionized water, vacuum dry at 100°C for 10h, and sinter at 500°C for 24h in an argon atmosphere to obtain ...

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Abstract

The invention discloses a graphene-coated lithium battery anode material and a preparation method thereof. The preparation method has the advantages that a graphene-coated lithium battery anode is prepared by a hydrothermal method; the preparation method is simple; compared with the method for preparing the nanometer structure type lithium battery anode under the high vacuum condition or high temperature condition, the vacuum degree is not required, the high temperature is not required, and the preparation cost is obviously reduced; the requirement on equipment is low, the reaction material iseasy to obtain, the preparation temperature is lower, the reaction conditions are easy to control, and the like; the lithium battery anode is coated by the graphene with higher conductivity, and thecuprous sulfide treated by carbon disulfide is used as the lithium battery anode material, so that the charging and discharging rates of the battery are effectively improved, and the transmission of electrons at the surface of the material is enhanced; in the embedding and deembedding process of lithium ions, the volume change of the material can be adjusted, the influence to the material propertyby the volume change is decreased, and the electrochemical property of the material is improved.

Description

technical field [0001] The invention relates to a graphene-coated lithium battery cathode material and a preparation method thereof, belonging to the technical field of lithium batteries. Background technique [0002] Lithium-ion batteries have been widely used in the fields of portable electronic devices and aviation and navigation due to their advantages such as high actual working voltage, high mass and volumetric energy density, and stable cycle performance during charge and discharge. However, at present, lithium-ion batteries are still difficult to provide long-distance guarantee for transportation vehicles. Therefore, it is the research work of lithium-ion batteries to study large-scale, high specific energy, low cost, and good safety lithium-ion battery materials that can meet high-load and renewable needs. direction for future efforts. For graphene-coated cuprous sulfide, it has received more attention in the field of lithium-ion batteries due to its advantages suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 李立强张文星李莉李飙曹译恒
Owner SHANGQIU NORMAL UNIVERSITY
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