Positive material of lithium ion battery

A technology for lithium ion batteries and anode materials, applied in the field of anode materials for lithium ion batteries, can solve the problems of rapid decline, active material and current collector falling off electrode life, etc., and achieve the effects of inhibiting falling off, eliminating battery deformation problems, and inhibiting volume expansion.

Active Publication Date: 2014-03-05
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But silicon also has great disadvantages: the volume expansion of silicon after lithium intercalation can reach as much as 300%-400%
Its violent expansion is easy to cause the active material and current collector to fall off, which makes the life of the electrode decrease rapidly.

Method used

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  • Positive material of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0025] A kind of lithium-ion battery anode material provided in this embodiment comprises graphite and silicon-based material, the surface of silicon-based material is coated with amorphous carbon, the median particle size of graphite is 5 μm, and the median particle size of silicon-based material is 5 μm, the mass of silicon-based material accounts for 15% of the total mass of the anode material, the mass of amorphous carbon accounts for 8% of the total mass of the anode material, and the graphite accounts for 77% of the total mass of the anode material.

[0026] Wherein, the graphite is specifically natural graphite, and the silicon-based material is specifically silicon dioxide.

[0027] Its preparation method comprises the following steps:

[0028] In the first step, put silicon dioxide in a high mixer, stir at a speed of 300r / min, then dissolve glucose in water to make a solution, add the solution to the sprayer, and make the solution flow in the form of 1 μm droplets Sp...

Embodiment 2

[0032] A kind of anode material of lithium ion battery provided in this embodiment comprises graphite and silicon-based material, the surface of silicon-based material is coated with amorphous carbon, the median particle diameter of graphite is 8 μm, and the median particle diameter of silicon-based material is 3 μm, the mass of silicon-based material accounts for 20% of the total mass of the anode material, the mass of amorphous carbon accounts for 10% of the total mass of the anode material, and the graphite accounts for 70% of the total mass of the anode material.

[0033] Wherein, the graphite is specifically artificial graphite, and the silicon-based material is specifically silicon.

[0034] Its preparation method comprises the following steps:

[0035] The first step is to place the silicon in a high mixer and stir it at a speed of 200r / min, then dissolve sucrose in water to make a solution, and add the solution to the sprayer to make the solution spray into the silicon...

Embodiment 3

[0039] The anode material of a lithium ion battery provided in this embodiment comprises graphite and a silicon-based material, the surface of the silicon-based material is coated with amorphous carbon, the median particle size of the graphite is 10 μm, and the median particle size of the silicon-based material is 6 μm, the mass of silicon-based materials accounts for 25% of the total mass of anode materials, the mass of amorphous carbon accounts for 12% of the total mass of anode materials, and the mass of graphite accounts for 63% of the total mass of anode materials.

[0040] Wherein, the graphite is specifically mesocarbon microspheres, and the silicon-based material is specifically silicon monoxide.

[0041] Its preparation method comprises the following steps:

[0042]The first step is to place silicon monoxide in a high mixer and stir at a speed of 400r / min, then dissolve polyvinyl alcohol in water to make a solution, add the solution to the sprayer, and make the soluti...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive material of a lithium ion battery. The positive material comprises graphite and a silicon-based material, wherein the surface of the silicon-based material is coated with amorphous carbon; the median particle size of the graphite is 2 to 10 microns; the median particle size of the silicon-based material is 2 to 10 microns; the mass of the silicon-based material accounts for 10 to 30 percent of the total mass of the positive material; the mass of the amorphous carbon accounts for 5 to 20 percent of the total mass of the positive material. Compared with the prior art, the positive material has the advantages that the volume expansion of the silicon-based material can be effectively suppressed by coating the amorphous carbon on the surface of the silicon-based material, so that the problem of battery deformation caused by the expansion of the silicon-based material is eliminated; meanwhile, active substances are prevented from falling from a collector, and thus the cycling performance of the battery is improved; the silicon-based material is mixed with the graphite, so that the volume per gram of the positive material can be greatly improved and is obviously higher than that of the graphite, and thus the cycling performance of the positive material is greatly improved compared with that of the silicon-based material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery anode material. Background technique [0002] With the diversification of functions of consumer electronic products, lithium-ion batteries are used as the energy supply of electronic products, and their capacity and service life have begun to attract people's attention. With the miniaturization and miniaturization of various consumer electronic products, the space left for lithium-ion batteries is becoming more and more limited. Therefore, it is necessary to increase the capacity of the battery, or more precisely, to increase the energy density of the battery. becomes particularly important. To increase the energy density of the battery, the improvement of the battery structure, the increase of the gram capacity of the positive electrode material and the increase of the gram capacity of the negative electrode material are all directions worth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/38H01M4/48
CPCH01M4/386H01M4/587H01M4/628Y02E60/10
Inventor 封锡胜
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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