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Negative electrode material for lithium battery, preparation method of negative electrode material and lithium battery

A negative electrode material, lithium battery technology, applied in battery electrodes, lithium storage batteries, negative electrodes, etc., can solve the problems of low first coulomb efficiency and low conductivity, and achieve high first charge and discharge capacity and first time Coulomb efficiency, and the preparation method is simple Easy to operate and relieve the effect of volume change

Inactive Publication Date: 2019-12-27
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon oxide also has problems such as low intrinsic conductivity and low first Coulombic efficiency.

Method used

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  • Negative electrode material for lithium battery, preparation method of negative electrode material and lithium battery
  • Negative electrode material for lithium battery, preparation method of negative electrode material and lithium battery
  • Negative electrode material for lithium battery, preparation method of negative electrode material and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The method for preparing the negative electrode material of the lithium battery provided in this embodiment is as follows:

[0057] Place the silicon oxide in a heat treatment furnace under the protection of argon atmosphere, heat it to 1000°C and keep it for 3 hours to obtain crystallized SiO x Composite materials (ie silicon oxide composite particles). 400g SiO x The composite material and water are ball milled at a ratio of 1:9 (mass ratio), and the milling time is controlled within 1-6h, and this example is 2h to obtain SiO x Slurry, add 20g nano silicon to the slurry, and ultrasonically disperse for 30 minutes to obtain SiO x / Si slurry, to SiO x Add 16g of carbon nanotubes (ie conductive material or conductive agent) to the / Si slurry, mechanically stir to evenly disperse, then add 80g of glucose (carbon source), vacuum and stir for 30min to obtain uniformly dispersed SiO with conductive material and carbon source x / Si composite material slurry, SiO x / Si composite ma...

Embodiment 2

[0061] The method for preparing the negative electrode material of the lithium battery provided in this embodiment is as follows:

[0062] Place the silicon oxide in a heat treatment furnace under the protection of argon atmosphere, heat it to 1050°C and keep it for 3 hours to obtain crystallized SiO x Composite materials. 400g SiO x The composite material and water are ball milled at a ratio of 1:9, ball milled for 3 hours to obtain SiO x Slurry, add 20g of nano silicon to the slurry, ultrasonically disperse for 30 minutes, and then perform vacuum stirring for 30 minutes to obtain SiO x / Si slurry, to SiO x Add 16g of carbon nanotubes to the / Si slurry, mechanically stir and disperse evenly, then add 80g of styrene-butadiene rubber and stir for 60min under vacuum to obtain evenly dispersed SiO with conductive material and organic carbon source x / Si composite material slurry, SiO x / Si composite material slurry is spray-dried to obtain SiO x / Si@C composite material precursor, the...

Embodiment 3

[0065] The method for preparing the negative electrode material of the lithium battery provided in this embodiment is as follows:

[0066] Place the silicon oxide in a heat treatment furnace under the protection of argon atmosphere, heat it to 1000°C and keep it for 3 hours to obtain crystallized SiO x Composite materials. 400g SiO x The composite material and water are ball milled at a ratio of 1:9 for 4 hours to obtain SiO x Slurry, add 40g of nano silicon to the slurry, ultrasonically disperse for 30 minutes, and then perform vacuum stirring for 30 minutes to obtain SiO x / Si slurry, to SiO x Add 16g of carbon nanotubes to the / Si slurry, mechanically stir and disperse evenly, then add 80g of styrene-butadiene rubber and stir for 60min under vacuum to obtain evenly dispersed SiO with conductive material and organic carbon source x / Si composite material slurry, SiO x / Si composite material slurry is spray-dried to obtain SiO x / Si@C composite material precursor, the precursor is...

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Abstract

The invention discloses a negative electrode material for a lithium battery, a preparation method of the negative electrode material and the lithium battery, and relates to the technical field of thelithium battery. The lithium battery has a core structure and a shell structure coating the core structure, wherein the core structure comprises silicon monoxide composite particles and nano silicon attached to the silicon monoxide composite particles, the silicon monoxide composite particles contain SiO, SiO2 and Si, and the shell structure is a carbon coating layer. The lithium battery is advantaged in that the negative electrode material provided can relieve overlarge volume change of the core structure in a lithium intercalation and deintercalation process, and has relatively high first charge-discharge capacity and first coulombic efficiency.

Description

Technical field [0001] The present invention relates to the technical field of lithium batteries, and in particular, to a negative electrode material for lithium batteries, a preparation method thereof, and lithium batteries. Background technique [0002] Lithium-ion batteries are used as the main power source for mobile phones, notebook computers and other portable electronic products due to their high energy density and long cycle life. They are gradually being used as power sources for electric vehicles and hybrid vehicles. Silicon is considered to be one of the most potential anode materials for lithium-ion batteries due to its high theoretical capacity (4200mAh / g) and low lithium insertion potential. However, in the process of lithium-silicon alloying and dealloying, the volume of silicon expands as high as 300%, causing material particles to break, loss of electrical contact between particles, powdered electrode structure, repeated generation of SEI film, sharp decline in m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/62H01M10/052
CPCH01M4/366H01M4/386H01M4/483H01M4/583H01M4/625H01M10/052H01M2004/027Y02E60/10
Inventor 李文超唐仁衡王英黄玲周庆
Owner GUANGDONG INST OF RARE METALS
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