Phosphor-doped silicon-graphite composite material, negative electrode material comprising same and lithium ion battery

A composite material and phosphorus doping technology, which is applied in the field of lithium-ion battery energy, can solve the problems of inapplicability to mass production, poor conductivity of silicon, and high cost, and achieve excellent cycle performance, improved conductivity, and easy operation.

Inactive Publication Date: 2017-10-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The huge volume change of the silicon material during the lithium intercalation / delithiation process can be reduced or even eliminated by nanosizing the silicon material, but this method is expensive and not suitable for mass production
The method of porosity can also suppress the expansion of silicon volume to a certain extent, but the large specific surface area will consume a large amount of lithium ions to form a solid electrolyte interface film (SEI film)
However, none of the above methods can fundamentally solve the problem of poor electrical conductivity of silicon. The electrical conductivity of silicon is improved by doping, and it is compounded with carbon, and a layer of carbon with good electrical conductivity is coated on the outside of the silicon material, which can not only provide lithium The transmission channel of ions and electrons, the carbon matrix can also inhibit the volume expansion of silicon, and at the same time prevent the silicon material from directly contacting the electrolyte, prevent the continuous fragmentation and regeneration of the SEI film, and achieve excellent electrochemical performance

Method used

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  • Phosphor-doped silicon-graphite composite material, negative electrode material comprising same and lithium ion battery
  • Phosphor-doped silicon-graphite composite material, negative electrode material comprising same and lithium ion battery
  • Phosphor-doped silicon-graphite composite material, negative electrode material comprising same and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] sample 1 # Preparation of:

[0060] The crystalline silicon powder with a purity of 99.9%, the particle size of 1-3 μm, and the red phosphorus powder with a purity of 98.5% are ball milled in the first step under the protection of argon; the mass of the crystalline silicon powder accounts for 99% of the total mass of the powder, The rotational speed of the ball mill was 350 rpm, the ball milling time was 6 hours, and the mass ratio of the stainless steel ball milling beads to the powder was 20:1 to obtain phosphorus-doped silicon powder.

[0061] The phosphorus-doped silicon powder obtained above and the graphite powder with a purity of 99.95% and a size of 8000 mesh were subjected to a second ball milling step under the protection of argon. The graphite powder mass accounts for 70% of the total powder mass, the ball mill speed is 400rpm, the ball milling time is 12h, and the mass ratio of stainless steel ball milling beads to powder is 20:1 to obtain a phosphorus-do...

Embodiment 2

[0066] sample 2 # Preparation of:

[0067] The crystalline silicon powder with a purity of 99.9%, the particle size of 1-3 μm, and the red phosphorus powder with a purity of 98.5% are ball milled in the first step under the protection of argon; the mass of the crystalline silicon powder accounts for 99% of the total mass of the powder, The rotational speed of the ball mill was 350 rpm, the ball milling time was 6 hours, and the mass ratio of the stainless steel ball milling beads to the powder was 20:1 to obtain phosphorus-doped silicon powder.

[0068] The phosphorus-doped silicon powder obtained above and the graphite powder with a purity of 99.95% and a size of 8000 mesh were subjected to a second ball milling step under the protection of argon. The graphite powder mass accounts for 50% of the total powder mass, the ball mill speed is 400rpm, the ball milling time is 12h, the mass ratio of stainless steel ball milling beads to powder is 20:1, and phosphorus doped silicon...

Embodiment 3

[0073] sample 3 # Preparation of:

[0074] The crystalline silicon powder with a purity of 99.9%, the particle size of 1-3 μm, and the red phosphorus powder with a purity of 98.5% are ball milled in the first step under the protection of argon; the mass of the crystalline silicon powder accounts for 99% of the total mass of the powder, , the rotational speed of the ball mill is 350rpm, the ball milling time is 6h, the mass ratio of stainless steel ball milling beads to powder is 20:1, and phosphorus-doped silicon powder is obtained.

[0075] The phosphorus-doped silicon powder obtained above and the graphite powder with a purity of 99.95% and a size of 8000 mesh were subjected to a second ball milling step under the protection of argon. The graphite powder mass accounts for 30% of the total powder mass, the ball mill speed is 400rpm, the ball milling time is 12h, the mass ratio of stainless steel ball milling beads to powder is 20:1, and phosphorus-doped silicon-graphite co...

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Abstract

The invention discloses a phosphor-doped silicon-graphite composite material. The phosphor-doped silicon-graphite composite material comprises phosphor-doped N-type silicon and graphite, is used as a negative active material used for a lithium ion battery, can be used for preventing huge volume expansion of the silicon and has the advantages of high capacity and favorable cycle stability. The invention also discloses a preparation method of the phosphor-doped silicon-graphite composite material. The preparation method comprises the steps of 1, ball-milling, in which the silicon and phosphor are ball-milled in a ball-milling tank; and 2, ball-milling, the ball-milled product in the step 1 and graphene powder are further ball-milled in the ball-milling tank. The invention also discloses a negative electrode material comprising the phosphor-doped silicon-graphite composite material and / or prepared according to the method and the lithium ion battery.

Description

technical field [0001] The application relates to a phosphorus-doped silicon-graphite composite material and its application as a negative electrode active material in a lithium-ion battery, belonging to the field of lithium-ion battery energy. Background technique [0002] With the continuous development of society and the increasingly serious environmental problems, the development of new clean energy such as solar energy and wind energy has become the focus of social attention. Among them, lithium-ion batteries play the dual important role of energy storage and release. Because of their stable discharge platform, high working voltage, good cycle performance, and no environmental pollution, they have become the mainstay of electric vehicles, mobile phones, laptop computers, aerospace equipment and military applications. The heart of an electronic device. Therefore, the development of new, efficient and cheap electrode materials has become one of the hot topics in the rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 沈彩黄世强
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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