A kind of lithium ion battery silicon carbon negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., and can solve the problems of high expansion rate, poor cycle performance, and low gram capacity of negative electrode materials, etc. Achieve the effect of low expansion rate, slow decay speed and excellent cycle performance

Active Publication Date: 2017-01-11
RIGHTFUL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a silicon-carbon negative electrode material for lithium ion batteries, which solves the problems of low gram capacity, high expansion rate and poor cycle performance of existing negative electrode materials

Method used

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  • A kind of lithium ion battery silicon carbon negative electrode material and preparation method thereof
  • A kind of lithium ion battery silicon carbon negative electrode material and preparation method thereof
  • A kind of lithium ion battery silicon carbon negative electrode material and preparation method thereof

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Embodiment 1

[0050] The lithium-ion battery silicon carbon negative electrode material of the present embodiment comprises a core-shell structure, and an intermediate layer is also arranged between the core and the shell; the core contains silicon monoxide, the intermediate layer is a buffer layer of hollow carbon spheres, and the shell is coated with graphite Floor.

[0051] The silicon carbon negative electrode material is granular; its particle size is 15-25 μm. The ratio of the diameter of the core to the thickness of the middle layer and the thickness of the shell is 100:50-100:200-500.

[0052] The preparation method of the lithium ion battery silicon carbon negative electrode material of the present embodiment comprises the following steps:

[0053] 1) Preparation of silicon precursor: Take 500g of toluene and put it into the reaction kettle, then add 10g of silicon monoxide (silicon material), 20g of sodium lauryl sulfate (dispersant), 1.0g of trimethylmethoxysilane (coupling age...

Embodiment 2

[0058] The lithium-ion battery silicon-carbon negative electrode material of the present embodiment comprises a core-shell structure, and an intermediate layer is also arranged between the core and the shell; the core is silicon monoxide, the intermediate layer is a buffer layer of hollow carbon spheres, and the shell is coated with graphite Floor.

[0059] The silicon carbon negative electrode material is granular; its particle size is 15-25 μm. The ratio of the diameter of the core to the thickness of the middle layer and the thickness of the shell is 100:50-100:200-500.

[0060] The preparation method of the lithium ion battery silicon carbon negative electrode material of the present embodiment comprises the following steps:

[0061] 1) Preparation of silicon precursor: Take 1000g of toluene into the reaction kettle, then add 10g of silicon monoxide (silicon material), 10g of sodium lauryl sulfate (dispersant), 5g of tributylmethoxysilane (coupling agent), 1g of divinylb...

Embodiment 3

[0066] The lithium-ion battery silicon-carbon negative electrode material of the present embodiment comprises a core-shell structure, and an intermediate layer is also arranged between the core and the shell; the core is silicon monoxide, the intermediate layer is a buffer layer of hollow carbon spheres, and the shell is coated with graphite Floor.

[0067] The silicon carbon negative electrode material is granular; its particle size is 15-25 μm. The ratio of the diameter of the core to the thickness of the middle layer and the thickness of the shell is 100:50-100:200-500.

[0068] The preparation method of the lithium ion battery silicon carbon negative electrode material of the present embodiment comprises the following steps:

[0069] 1) Preparation of silicon precursor: Take 100g of chloroform and add it to the reaction kettle, then add 10g of silicon monoxide (silicon material), 30g of hexadecyltrimethylammonium bromide (dispersant), 0.5g of trimethylchlorosilane ( Coup...

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Abstract

The invention discloses a lithium ion battery silicon-carbon negative electrode material and a preparation method thereof. The negative electrode material comprises a core-shell structure, and a middle layer is arranged between the core and the shell. The core comprises a silicon material, the middle layer is a buffer layer composed of hollow carbon spheres, and the shell is a graphite-coated layer. The core comprises a silicon material, and thus the gram volume of the negative electrode material is increased. Moreover, the buffer layer composed of hollow carbon spheres relieves the silicon expansion, and the liquid absorbing and maintaining performance of the negative electrode material is also improved. The graphite coated layer has very good mechanical strength and conductivity. The materials in each layer cooperate with each other and generate a synergetic effect, so that the structure of the negative electrode material becomes more stable, and the structure is not easy to destruct during the discharge / charge process. The negative electrode material has the advantages of high gram volume, strong liquid absorbing and maintaining performance, and low expansion rate. The lithium ion battery using the negative electrode material has the advantages of high capacity maintaining rate during the circle process, slow attenuation speed, and excellent cycling performance, and is especially suitable for the field of mobile communication.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a silicon-carbon negative electrode material for a lithium-ion battery, and also relates to a preparation method for the silicon-carbon negative electrode material for a lithium-ion battery. Background technique [0002] Lithium-ion battery refers to the general term for batteries with lithium-ion intercalation compounds as positive electrode materials. The charging and discharging process of lithium-ion batteries is the process of intercalation and deintercalation of lithium ions; in the process of intercalation and deintercalation of lithium ions, it is accompanied by the intercalation and deintercalation of equivalent electrons with lithium ions. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte; and the material used as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/134H01M4/133H01M4/139H01M4/1393H01M4/1395
CPCB82Y30/00H01M4/366H01M4/483H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 程先桃
Owner RIGHTFUL TECH
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