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Method for preparing lithium ion battery anode composite material through template method

A technology for lithium ion batteries and composite materials is applied in the field of preparing lithium ion battery anode composite materials by a template method, which can solve the problems of poor electrical conductivity of SiO materials, and achieve the effects of wide electrochemical window, inhibition of corrosion, and reduction of interface impedance.

Active Publication Date: 2017-01-11
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, the conductivity of SiO material is extremely poor, and the order of magnitude of conductivity is in the range of insulators (<10-12S / cm)

Method used

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Examples

Experimental program
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Embodiment 1

[0033] The template method provided in this embodiment prepares the method for lithium-ion battery anode composite material, at least comprises the following steps:

[0034] In the first step, NaCl, artificial graphite with an average particle size of 3 μm, SiO particles with an average particle size of 10 μm, and sucrose are added to water, and the mass ratio of NaCl, artificial graphite, SiO particles, and sucrose is 1:5:1: 1. After ultrasonic stirring, evaporate to dryness at 100°C, and then perform ball milling to obtain the mixture;

[0035] In the second step, the mixture is placed in a carbonization furnace, and carbonized at 1000°C under a nitrogen atmosphere, then soaked in water to remove NaCl, and dried at 100°C to obtain SiO with a porous structure and a carbon coating. / Few-layer graphite / artificial graphite anode composite material, the thickness of the carbon coating layer is 20nm-5μm.

Embodiment 2

[0037] The template method provided in this embodiment prepares the method for lithium-ion battery anode composite material, at least comprises the following steps:

[0038] In the first step, add NaCl, artificial graphite with an average particle size of 8 μm, SiO particles with an average particle size of 20 μm, and glucose in water, and the mass ratio of NaCl, artificial graphite, SiO particles, and glucose is 4:8:1.2: 0.8, magnetically stirred evenly, evaporated to dryness at 90°C, and then ground to obtain the mixture;

[0039] In the second step, the mixture is placed in a carbonization furnace, and carbonized at 800°C under an argon protective atmosphere, then soaked in water to remove NaCl, and dried at 110°C to obtain a porous structure and a carbon coating. SiO / graphene / artificial graphite anode composite material, the thickness of the carbon coating layer is 20nm-5μm.

Embodiment 3

[0041] The template method provided in this embodiment prepares the method for lithium-ion battery anode composite material, at least comprises the following steps:

[0042] In the first step, add NaCl, artificial graphite with an average particle size of 12 μm, SiO particles with an average particle size of 30 μm, and fructose in water, and the mass ratio of NaCl, artificial graphite, SiO particles, and fructose is 1.5:7:2.2: 3.5. After stirring evenly with the stirring paddle, evaporate to dryness at 110°C, and then carry out roller milling to obtain the mixture;

[0043] In the second step, the mixture is placed in a carbonization furnace, and carbonized at 700°C under a helium protective atmosphere, then soaked in water to remove NaCl, and dried at 90°C to obtain a porous structure and a carbon coating. SiO / few-layer graphite / artificial graphite anode composite material, the thickness of the carbon coating layer is 20nm-5μm.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for preparing a lithium ion battery anode composite material through a template method. The method at least comprises the following steps: adding NaCl, artificial graphite, SiO particles and a carbon source into water, stirring the materials uniformly, evaporating to be dry, and then crushing and mixing to obtain a mixture; and placing the mixture into a carbonization furnace, performing carbonization treatment at 500-1200 DEG C in an inert gas protective atmosphere, then soaking the mixture with water to remove NaCl, and drying to obtain the anode composite material. The lithium ion battery anode composite material prepared by the method provided by the invention through a NaCl template method has a structure with multiple holes, and the porous composite material can well solve the problem of volume expansion of SiO during lithium embedding, so that the cycling stability of a silicon-based lithium ion battery anode material is well improved on the premise that a relatively high battery capacity is maintained, and the requirements on high-performance lithium ion battery anode materials can be met.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing lithium ion battery anode composite materials by a template method. Background technique [0002] For a long time, because silicon oxide (SiO) has a good volume effect, people have tried to use it as a lithium-ion battery composite material. It is generally believed that the charging and discharging mechanism of SiO negative electrode is as follows: [0003] SiO+Li→Li 2 O+Si(1) [0004] SiO+Li→Li 4 SiO 4 +Si(2) [0005] Si+Li→Li 4.4 Si(3) [0006] When SiO is used as a composite material, its first Coulombic efficiency is low, mainly because the first step reactions (Formula 1) and (Formula 2) are irreversible reactions, and the generated Li 2 O. Li 4 SiO 4 And reactions such as the contact decomposition and condensation of silicon oxides and organic electrolytes consume more lithium ions. [0007] Generated Li 2 O. Li ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 晏荦周豪杰仰韻霖
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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