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Negative electrode material, preparation method of material, negative electrode, and battery comprising negative electrode

A negative electrode material and negative electrode technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation process, high preparation cost, and unsuitability for large-scale production, and achieve simple preparation method and high capacity , is conducive to the effect of rapid transfer

Active Publication Date: 2014-03-26
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] U.S. Patent US20080261116A1 discloses a method for depositing silicon particles on the surface of a carbon material, using a silicon-containing precursor to contact and decompose a silicon particle coating on the surface of a carbon material through a gas phase; On the surface of a continuous film, carbon nanotubes are deposited to prepare negative electrode materials for lithium-ion batteries; however, these preparation methods are complex and costly, and are not suitable for large-scale production

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  • Negative electrode material, preparation method of material, negative electrode, and battery comprising negative electrode
  • Negative electrode material, preparation method of material, negative electrode, and battery comprising negative electrode
  • Negative electrode material, preparation method of material, negative electrode, and battery comprising negative electrode

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preparation example Construction

[0080] A preparation method of a negative electrode material, the preparation method comprising the steps of:

[0081] Dissolving the carbon material precursor in the first solvent, adding silicon oxide SiO to the first solvent dissolved with the carbon material precursor x , after mixing, add the second solvent to make the carbon material precursor coated silicon oxide SiO x Precipitation, the precipitated product is dried and then subjected to high temperature treatment to obtain carbon material-coated silicon oxide SiO x , where 1≤x≤2.

[0082] The first solvent is used to dissolve the carbon material precursor, so that the carbon material precursor is fully and uniformly dispersed, and the first solvent is selected from one of dimethylformamide, dimethyl sulfoxide, sulfolane or N-methylpyrrolidone .

[0083] Specifically, the first solvent dissolved with the carbon material precursor and the silicon oxide SiO x The mixing is done by ball milling, the rotational speed r...

Embodiment approach

[0098] Under another preferred embodiment, silicon oxide SiO is added to the first solvent in which the carbon material precursor is dissolved x Add iron powder together with graphene, and then dissolve the iron powder in the product obtained by high temperature treatment with dilute hydrochloric acid solution to obtain a porous negative electrode material, which provides a larger buffer space for the volume effect of the negative electrode material during charging and discharging. At the same time, the contact between the carbon material coating layer and the silicon oxide layer can be improved, thereby improving the electrochemical performance of the negative electrode material. Specifically, the concentration of dilute hydrochloric acid is 1.6-2.4 mol / L, more preferably, the concentration of dilute hydrochloric acid is 2 mol / L.

[0099] Specifically, PAN was dissolved in NMP to form a homogeneous solution, and nano-SiO or SiO 2 Particles, graphene dispersed in a homogeneou...

Embodiment 1

[0143] Dissolve 2.17g of PAN in 12mL of NMP to form a homogeneous solution, 0.8g of SiO 2 Mixed with PAN solution, the mixture was passed through a high-energy ball mill (Pulverisette7, Germany) at a speed of 300rpm, mechanically milled for 36h, using zirconia balls with a diameter of 5 mm, and the weight ratio of zirconia balls to the mixture was 10:1. After ball milling, ethanol was added to the solution to make the PAN-coated SiO 2 precipitation. PAN coated SiO 2 At 1000°C, under the protection of ultra-high-purity nitrogen gas for 3 hours, PAN was pyrolyzed into carbon, the heating rate was 10K / min, and the gas flow rate was 100mL / min.

[0144] figure 1 It is the negative electrode material SiO that embodiment 1 provides 2 / C X-ray diffraction pattern. It can be seen from the figure that SiO 2 and C are amorphous.

[0145] figure 2 It is the negative electrode material SiO that embodiment 1 provides 2 The thermogravimetric analysis (TG) and differential thermal a...

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Abstract

The invention relates to a negative electrode material which at least comprises SiOx and a carbon material, wherein x is larger than or equal to 1 and is less than or equal to 2. The invention also relates to a negative electrode comprising the negative electrode material, a battery with the negative electrode, and a preparation method of the negative electrode material. The negative electrode with a porous structure can provide a buffer space for a volume effect of the SiOx in charge and discharge processes, SiOx particles with the nano size can enable the volume change during ion implantation and prolapse to be reduced, the volume effect of silicon-based negative electrode material can be reduced, and the cycle performance of the negative electrode material is ensured. The negative electrode material provided by the invention is simple and feasible and has an industrialization prospect.

Description

technical field [0001] The invention relates to a negative electrode material, in particular to a negative electrode material containing silicon oxide. [0002] The invention also relates to a preparation method of the negative electrode material. [0003] The invention also relates to a negative electrode containing silicon oxide negative electrode material. [0004] The invention also relates to a battery containing silicon oxide negative electrode material. Background technique [0005] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high open circuit voltage, high energy density, long service life, and no memory effect, and are widely used. The development of a safe, low-cost, high-capacity, stable cycle performance, and fast charge-discharge lithium-ion battery is an urgent need for technological progress in portable electronic devices and electric vehicles. [0006] At present, the commercial lithium-ion battery anode mate...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M4/131H01M10/0525
CPCH01M4/626H01M4/38H01M4/625H01M4/48H01M4/134Y02E60/122H01M4/131H01M10/0525Y02E60/10
Inventor 陈璞李明齐
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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