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Negative electrode material of lithium-ion battery, preparation method thereof, negative electrode and lithium-ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, negative electrodes, etc., can solve problems such as poor conductivity, achieve the effects of enhancing conductivity, increasing charge transfer rate, and avoiding corrosion

Inactive Publication Date: 2018-06-29
GP BATTERIES INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively poor conductivity of Si and SiO, they are limited as electrode active materials for fast-charging lithium-ion batteries.

Method used

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  • Negative electrode material of lithium-ion battery, preparation method thereof, negative electrode and lithium-ion battery
  • Negative electrode material of lithium-ion battery, preparation method thereof, negative electrode and lithium-ion battery
  • Negative electrode material of lithium-ion battery, preparation method thereof, negative electrode and lithium-ion battery

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preparation example Construction

[0038] The present invention also provides a kind of preparation method of lithium-ion battery negative electrode material as above, comprises the steps:

[0039] Mix and dissolve silicon monoxide particles, graphite particles, binders and surfactants in a solvent to form a suspension;

[0040] After the suspension is spray-dried, it is calcined to obtain the lithium-ion battery negative electrode material.

[0041] According to a specific embodiment of the present invention, the binder is a carbon-containing soluble organic compound, and the surfactant is a long-chain organic compound. Wherein, the binder accounts for 1-20% by weight of the whole solid particles (silicon oxide particles, graphite particles, binder and surfactant). The surfactant accounts for 1-5% by weight of the whole solid particle.

[0042] According to a specific embodiment of the present invention, the binder includes at least one of monosaccharide, oligosaccharide or polysaccharide, and the surfactant...

Embodiment 1

[0063] Mix 3-(methacryloyloxy)propyltrimethoxysilane (MPS) and silicon monoxide (SiO) and dissolve in ethanol water solvent, wherein the mass percentage of water in the ethanol water mixed solvent is 20%. After mixing a suspension was formed which had a pH of 4.5. The suspension was dispersed by ultrasonic for 30 minutes, then heated to 70-80° C. for 6-8 hours, and stirred while reacting. After the reaction was completed, the reaction solution was centrifuged, and the precipitate was vacuum-dried to obtain SiO grafted with PNIPAAM.

Embodiment 2

[0065] 100 grams of SiO with an average diameter of 1 micron, 100 grams of sucrose, 1800 grams of graphite with an average particle diameter of 5 microns and 3 grams of sodium dodecylbenzenesulfonate (SDBS) were added to 7 kg of water and dispersed by mechanical stirring. The mixture is spray-dried at 155-170° C. to obtain a pomegranate structure negative electrode material. These anode materials were then calcined in a furnace at 800-850° C. for 2-4 hours under an argon atmosphere to produce particles with an average diameter of about 15 μm. The particle BET specific surface area is 2.9348m 2 / g.

[0066] As shown in Figure 1 and Figure 2, SEM and EDS were used to characterize the negative electrode material. The scanning electron microscope photo in Figure 1 shows that SiO and graphite particles have aggregated into a composite structure. The attached EDS image of Figure 2 shows that the structure is uniformly aggregated by multiple graphite particles and SiO particles.

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Abstract

The invention relates to a negative electrode material of a lithium-ion battery, a preparation method thereof, a lithium-ion battery negative electrode comprising the negative electrode material and the lithium-ion battery. The negative electrode material is prepared from silicon monoxide particles, graphite particles and a carbon-coated layer, wherein the graphite particles and the silicon monoxide particles are doped with each other to form silicon monoxide / graphite composite particles; the carbon-coated layer covers the outer surfaces of the silicon monoxide / graphite composite particles toform the negative electrode material with a pomegranate structure.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery, a preparation method thereof, a negative electrode of a lithium ion battery comprising the negative electrode material, and a lithium ion battery. Background technique [0002] Rechargeable lithium-ion batteries have been widely used in portable devices and electric vehicles. Compared with lead-acid and nickel metal hydride batteries, lithium-ion batteries exhibit the advantages of no memory effect, high specific capacity, environmental friendliness, and fast charging and discharging. , so it is widely used in energy storage batteries. [0003] In particular, the rapid charging technology of lithium-ion batteries has attracted much attention in recent years. It can bring the battery back into use within minutes of being completely drained. Charging rates can be optimized at the level of active materials, electrodes and cells. The most frequently used approach is to redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/366H01M4/48H01M4/587H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027H01M4/0471H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/621Y02E60/10H01M4/134H01M4/1395H01M4/386H01M4/583
Inventor 任现文周如心郑为工刘佳淼胡伟辰简国丰
Owner GP BATTERIES INT LTD
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