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Lithium ion battery negative electrode material and preparation method therefor, and lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of electrochemical performance such as poor cycle stability, poor electronic/ionic conductivity, volume expansion, etc., to achieve simple and easy Excellent operation and rate performance, high capacity effect

Inactive Publication Date: 2017-07-07
HUIZHOU TOPBAND ELECTRICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when molybdenum disulfide is used as a negative electrode material for lithium-ion batteries, its electrochemical performance such as cycle stability is not good, mainly due to its poor electronic / ionic conductivity and volume expansion caused by repeated intercalation and deintercalation of lithium ions.

Method used

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  • Lithium ion battery negative electrode material and preparation method therefor, and lithium ion battery
  • Lithium ion battery negative electrode material and preparation method therefor, and lithium ion battery
  • Lithium ion battery negative electrode material and preparation method therefor, and lithium ion battery

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preparation example Construction

[0034] Such as figure 1 As shown, the preparation method of lithium ion battery negative electrode material of the present invention, negative electrode material is three-dimensional porous molybdenum disulfide / nitrogen-doped graphene composite material, and this preparation method comprises the following steps:

[0035] S1. Preparation of molybdenum disulfide nanosheets.

[0036] Specifically, this step S1 may include the following steps:

[0037] S1.1. Add the molybdenum disulfide powder into the nitrogen-methylpyrrolidone solution, and sonicate in an ice-water bath to obtain a molybdenum disulfide dispersion with a concentration of 0.1-0.2 g / ml. The temperature of the ice-water bath can be 0±5°C; the ultrasonic time is 4-10 hours.

[0038] S1.2. Centrifuge the molybdenum disulfide dispersion at 1000-2000 rpm for 0.5-4 hours at high speed; after centrifugation, the supernatant contains small-sized (30-200 nm) molybdenum disulfide nanosheets.

[0039] The supernatant is fi...

Embodiment approach

[0042] As an optional implementation manner, step S2 may include the following steps:

[0043] S2.1. Disperse molybdenum disulfide nanosheets in dimethylformamide solution, and ultrasonically in an ice-water bath to obtain a uniform dispersion of molybdenum disulfide nanosheets with a concentration of 2-8g / ml; the temperature of the ice-water bath can be 0±5℃; ultrasonic time is 1-4 hours.

[0044] S2.2. Disperse graphene oxide flakes in dimethylformamide solution, and ultrasonically in an ice-water bath to obtain a uniform dispersion of graphene oxide flakes with a concentration of 2-8g / ml; the temperature of the ice-water bath can be 0± 5°C; ultrasonic time is 1-4 hours.

[0045] Steps S2.1 and S2.2 can be performed sequentially or simultaneously.

[0046] S2.3. Mix the molybdenum disulfide nanosheet dispersion and the graphene oxide sheet dispersion, and sonicate in an ice-water bath to obtain a uniform mixed solution containing molybdenum disulfide nanosheets and graphen...

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Abstract

The invention discloses a lithium ion battery negative electrode material and a preparation method therefor, and a lithium ion battery. The negative electrode material is a three-dimensional porous molybdenum disulfide / nitrogen-doped graphene composite material. The preparation method comprises the following steps of S1, preparing molybdenum disulfide nanosheets; S2, preparing a mixed solution comprising the molybdenum disulfide nanosheets and graphene oxide sheets; S3, performing a reaction on the mixed solution at a high temperature to obtain a three-dimensional solid-state object; and S4, performing freezing and drying on the obtained three-dimensional solid-state object to obtain the three-dimensional porous molybdenum disulfide / nitrogen-doped graphene composite material. The three-dimensional porous molybdenum disulfide / nitrogen-doped graphene composite material is prepared by adopting a co-assembling method, so that the preparation method is simple and easy to operate, and can be used for batch production; and the composite material has the three-dimensional porous structure, and can achieve the advantages of high capacity, high cycling stability, excellent rate capability and the like when the composite material is used as the negative electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium batteries have the characteristics of high energy density, high voltage, light weight, no pollution, no memory effect, etc., and overcome the shortcomings of poor safety performance of lithium batteries, and are widely used in portable appliances (mobile phones, digital cameras, notebook computer camcorders) , CD player, etc.), energy storage (wind energy, water energy, tidal energy, solar energy, etc.), large-scale power equipment (electric vehicles, hybrid vehicles, etc.), and power grid peak shaving and many other fields. Due to the state's policy support for power battery companies, the demand for lithium-ion batteries in the field of electric vehicles or hybrid electric vehicles has exploded. [0003] However, the most common anode material...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/5815H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 钟卓洪
Owner HUIZHOU TOPBAND ELECTRICAL TECH CO LTD