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Molybdenum disulfide/graphene (MoS2/rGo) lithium ion battery negative electrode material and preparation method of material

A lithium-ion battery and molybdenum disulfide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle stability, low cycle stability, and capacity loss, and achieve high specific capacity and strong operability , The method is simple and reliable

Inactive Publication Date: 2014-07-02
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its cycle stability is extremely low due to its low electronic / ionic conductivity and severe volume expansion during the lithium-deintercalation process.
In addition, during the battery reaction, MoS 2 with Li + A reaction occurs to form insoluble Li 2 S, Li 2 S catalyzes the decomposition of the electrolyte to form a thick polymer layer, leading to irreversible capacity loss, which is also the reason for its poor cycle stability.

Method used

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  • Molybdenum disulfide/graphene (MoS2/rGo) lithium ion battery negative electrode material and preparation method of material
  • Molybdenum disulfide/graphene (MoS2/rGo) lithium ion battery negative electrode material and preparation method of material
  • Molybdenum disulfide/graphene (MoS2/rGo) lithium ion battery negative electrode material and preparation method of material

Examples

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preparation example Construction

[0027] Molybdenum disulfide / graphene (MoS) of the present invention 2 / rGO) lithium ion battery negative electrode material and preparation method thereof, adopt hydrothermal method preparation, comprise the steps:

[0028] Step 1. Take sodium molybdate, thiourea, graphene oxide and deionized water 30ml to prepare MoS according to the molar ratio of 1:3.75~4.5:1~3 2 / rGO reaction raw materials;

[0029] Step 2, the MoS described in step 1 2 The reaction raw materials are put into a hydrothermal reaction kettle, and the hydrothermal reaction is carried out at 180-220°C for 23-25 ​​hours to obtain MoS 2 / rGO black product;

[0030] Step 3, the MoS described in step 2 2 / rGO was filtered and washed, then placed in a vacuum drying oven, and dried at 60-90°C.

Embodiment 1

[0032] Step 1. Take 0.300g of sodium molybdate, 0.354g of thiourea, 0.014g of graphene oxide and 30ml of deionized water to prepare MoS 2 / rGO reaction raw materials;

[0033] Step 2, the MoS described in step 1 2 The reaction raw materials were put into a hydrothermal reaction kettle, and the hydrothermal reaction was carried out at 180°C for 23h to obtain MoS 2 / rGO black product;

[0034] Step 3, the MoS described in step 2 2 / rGO was filtered and washed, then placed in a vacuum drying oven, and dried at 60-90°C.

Embodiment 2

[0036] The difference between this example and example 1 is that in step 1, sodium molybdate 0.300g, thiourea 0.400g, graphene oxide 0.028g and deionized water 30ml; in step 2, the reaction temperature is 200°C, and the reaction time is 24h; Others are the same as in Example 1.

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Abstract

The invention discloses a molybdenum disulfide / graphene (MoS2 / rGo) lithium ion battery negative electrode material and a preparation method of the material. The MoS2 / rGo composite material is prepared by a hydrothermal method, and the prepared half-battery is tested to be high in specific capacity and stable in circulation performance. The method is simple and reliable, good in process repeatability and high in operability. The preparation method comprises the following steps of (1) taking proper amount of sodium molybdate, thiourea and graphene oxide as raw materials, (2) preparing a sample by the hydrothermal method, and (3) filtering, washing and carrying out vacuum drying to obtain the needed product.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a molybdenum disulfide / graphene (MoS2 / rGO) lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is currently the most widely used rechargeable mobile power supply. So far, it has been widely used in mobile phones, notebook computers, digital cameras, electronic translators, etc. In addition, it is also used in medical devices, electric vehicles, aerospace , national defense and military fields have broad application prospects and development space. Lithium-ion battery electrode materials are the core of lithium-ion battery research at present, and the research on negative electrode materials mainly focuses on the following aspects: low electrode potential, high specific capacity and good cycle stability, and electrolyte and viscosity. Good compatibil...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58
CPCH01M4/362H01M4/58H01M4/625H01M10/0525Y02E60/10
Inventor 王增梅蔡亚菱
Owner SOUTHEAST UNIV
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