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Lithium-ion battery, negative electrode material, and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve problems such as limited applications, achieve the effect of buffering huge volume changes, excellent cycle performance and rate discharge performance, and improving specific capacity

Active Publication Date: 2017-07-28
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that elemental silicon has a huge volume change during repeated cycles, which limits its application as an anode material for lithium-ion batteries

Method used

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  • Lithium-ion battery, negative electrode material, and preparation method thereof
  • Lithium-ion battery, negative electrode material, and preparation method thereof
  • Lithium-ion battery, negative electrode material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Weigh 0.75Kg of silicon and silicon monoxide respectively, add them to the ultra-fine circulating ball milling equipment successively, and add 6Kg of water, and circulate ball milling for 5 hours, and the average particle size of the detection sample is 400-600nm;

[0037] (2) The artificial graphite (average particle diameter is 4.5 μm) that takes 3.5Kg is added in the circulation ball mill, and the water that adds 14Kg, circulation ball mills 30 minutes, wait to mix evenly, add 15g polyvinyl alcohol (molecular weight is 5000), Stirring to obtain a slurry with a solid content of 20wt%;

[0038] (3) The slurry in step (2) is processed by centrifugal spray drying equipment, the spray drying inlet temperature is set to 220°C, the outlet temperature is set to 110°C, and the lithium ion battery negative electrode material precursor is obtained after the spray drying treatment is completed. thing;

[0039] (4) Carry out carbonization treatment on the lithium-ion battery...

Embodiment 2

[0045] (1) Weigh 1.5Kg of silicon, add in the ultra-fine circulating ball milling equipment successively, and add 6Kg of water, circulate ball milling for 5 hours, the average particle diameter of the detection sample is 400-600nm;

[0046] (2) The artificial graphite (average particle diameter is 4.5 μ m) that takes 3.5Kg is added in the circulation ball mill, and the water that adds 14Kg, circulation ball mill 30 minutes, wait to mix evenly, add 15g polyvinyl alcohol (molecular weight is 5000), Stirring to obtain a slurry with a solid content of 20wt%;

[0047] (3) The slurry in step (2) is processed by centrifugal spray drying equipment, the spray drying inlet temperature is set to 220°C, the outlet temperature is set to 110°C, and the lithium ion battery negative electrode material precursor is obtained after the spray drying treatment is completed. thing;

[0048] (4) Carry out carbonization treatment on the lithium-ion battery anode material precursor in step (3). Indus...

Embodiment 3

[0051] (1) Weigh 1.5kg of silicon monoxide and add it to the ultra-fine circulating ball milling equipment, and add 6Kg of water, and circulate the ball mill for 5 hours, and the average particle size of the test sample is 400-600nm;

[0052] (2) The artificial graphite (average particle diameter is 4.5 μ m) that takes 3.5Kg is added in the circulation ball mill, and the water that adds 14Kg, circulation ball mill 30 minutes, wait to mix evenly, add 15g polyvinyl alcohol (molecular weight is 5000), Stirring to obtain a slurry with a solid content of 20wt%;

[0053] (3) The slurry in step (2) is processed by centrifugal spray drying equipment, the spray drying inlet temperature is set to 220°C, the outlet temperature is set to 110°C, and the lithium ion battery negative electrode material precursor is obtained after the spray drying treatment is completed. thing;

[0054] (4) Perform heat treatment on the lithium-ion battery anode material precursor in step (3). During the hea...

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Abstract

The invention provides a preparation method of a lithium ion battery anode material, which comprises the following steps: performing wet ball milling of silicon and / or silicon monoxide to reach a nanoscale average particle size; well mixing the materials obtained in step (1) with graphite and a solvent, then well mixing with a stabilizing agent to obtain slurry, controlling the solid content of the slurry to be 10-30 wt%; performing spray drying of the slurry to obtain an anode material precursor, wherein the inlet temperature in spray drying is 180 DEG C-250 DEG C and the outlet temperature is 100 DEG C-120 DEG C; performing carbonizing treatment of the anode material precursor, wherein the total amount of silicon and silicon monoxide accounts for 5 wt%-50 wt% of the total amount of silicon, silicon monoxide, and graphite. The invention also provides a lithium ion battery anode material prepared by the method, and a lithium ion battery with the anode material. The lithium ion battery anode material of the invention has less size change during repeated cyclic process, thus has excellent cycle performance and rate discharge performance, increases the specific capacity of the lithium ion battery, and has wide application prospects.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a negative electrode material of a high-capacity lithium ion battery and a preparation method thereof, and also relates to a lithium ion battery containing the negative electrode material. Background technique [0002] Lithium-ion battery is a new type of secondary chemical power source. Compared with lead-acid, nickel-metal hydride, and nickel-cadmium secondary batteries, it has the advantages of no memory effect, high specific capacity, environmental friendliness, and fast charge and discharge, so it is widely used for energy storage batteries. Its downstream covers notebook computers, mobile phones, digital cameras, game consoles, etc., and is extremely competitive in the field of new energy vehicles as a power battery. With the development of electronic equipment in the field of miniaturization, intelligence and multi-function, lithium batteries are required to have smaller v...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCY02E60/10
Inventor 牟国洪乔永民沈龙李念民李辉
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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