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High-compaction silicon-carbon negative electrode material for lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as difficulty in completeness, achieve the effects of reduced carbon residue rate, suitable for large-scale production, and convenient operation

Active Publication Date: 2020-09-29
SHENZHEN XIANGFENGHUA TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a high-pressure compacted silicon-carbon negative electrode material for lithium-ion batteries and its preparation method, which realizes two-phase coating by controlling furnace pressure to prepare high-pressure The preparation method of solid silicon-carbon negative electrode material overcomes the defect that the carbon coating on the surface of silicon-carbon material is uneven and difficult to complete at present, and improves the compaction density; the negative electrode material prepared by the present invention has large reversible capacity for the first time and excellent cycle performance Simple, large-scale preparation, low cost

Method used

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  • High-compaction silicon-carbon negative electrode material for lithium ion battery and preparation method thereof

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preparation example Construction

[0021] The invention discloses a method for preparing a high-pressure compacted silicon-carbon negative electrode material for a lithium-ion battery, comprising the following steps:

[0022] (1) Mixture:

[0023] The graphite precursor, binder, and nano-silicon are added into a mechanical fusion machine according to a certain ratio and processed for 5-20 minutes to obtain a silicon-carbon negative electrode material precursor. The graphite precursor is one or more mixtures of artificial graphite or natural graphite, with an average particle size D50 of 5-10 μm; the binder is one or more mixtures of coal-based or oil-based pitch, with a softening point of 200-300°C; the average particle diameter D50 of the nano-silicon is 10-100 nm; and the mass ratio of graphite precursor, binder, and nano-silicon is 1:0.005-0.03:0.01-0.1; and, mechanical fusion The speed of machine processing is 600-1000 rpm.

[0024] (2) Two-phase coated carbonization:

[0025] Place the silicon-carbon an...

Embodiment 1

[0029] A preparation method of a high-pressure compacted silicon-carbon negative electrode material for a lithium-ion battery, comprising the following steps:

[0030] (1) Mixture:

[0031] The graphite precursor, binder, and nano-silicon are added into a mechanical fusion machine according to a certain ratio and processed for 5-20 minutes to obtain a silicon-carbon negative electrode material precursor. The graphite precursor is artificial graphite with an average particle diameter D50 of 10 μm; the binder is coal-based pitch with a softening point of 200° C.; the average particle diameter D50 of the nano-silicon is 10 nm; and the graphite precursor, viscose The mass ratio of binder to nano-silicon is 1:0.005:0.1; and the rotational speed of the mechanical fusion machine is 1000 rpm.

[0032] (2) Two-phase coated carbonization:

[0033] Place the silicon-carbon anode material precursor obtained in step (1) in a nitrogen atmosphere protection furnace for carbonization, and r...

Embodiment 2

[0036] A preparation method of a high-pressure compacted silicon-carbon negative electrode material for a lithium-ion battery, comprising the following steps:

[0037] (1) Mixture:

[0038] The graphite precursor, binder, and nano-silicon are added into a mechanical fusion machine according to a certain ratio and processed for 5-20 minutes to obtain a silicon-carbon negative electrode material precursor. The graphite precursor is natural graphite, and the average particle diameter D50 is 5 μm; the binder is oil-based pitch, and the softening point is 300° C.; the average particle diameter D50 of the nano-silicon is 100 nm; and the graphite precursor, The mass ratio of the binder to nano-silicon is 1:0.03:0.03; and the rotational speed of the mechanical fusion machine is 600rpm.

[0039] (2) Two-phase coated carbonization:

[0040] Place the silicon-carbon anode material precursor obtained in step (1) in a nitrogen atmosphere protection furnace for carbonization, and raise th...

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Abstract

The invention discloses a preparation method of a high-compaction silicon-carbon negative electrode material for a lithium ion battery. The furnace pressure of a nitrogen atmosphere protection furnaceis simply controlled, smoke volatilized from asphalt forms a gas-solid two-phase interface on a surface of a silicon-carbon negative electrode, the innermost layer is solid-phase coating of asphalt,the outer layer is gas-phase coating of a smoke component volatilized from the asphalt, and the obtained outer-layer carbon coating layer is uniform and compact by adopting a method of taking the gas-phase coating as supplementary secondary coating of the solid-phase coating, so the specific surface area of the material is reduced, direct contact between silicon and an electrolyte is isolated, andthe cycle performance of the battery is improved, and meanwhile, the dosage of the asphalt can be further reduced, the dosage of the asphalt is less than 5%, and the carbon residue rate is further reduced, so the silicon-carbon negative electrode material prepared by the method has high compaction density and excellent cycle performance.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a high-pressure compacted silicon-carbon negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] With the wide application and rapid development of various portable electronic devices and electric vehicles, people's demand and performance requirements for the power supply of various electrical products are also getting higher and higher. It has been successfully and widely used in the field of mobile electronic terminal equipment in the past ten years. [0003] The improvement of lithium-ion battery performance mainly depends on the performance of lithium intercalation and extraction electrode materials. At present, mesophase carbon microspheres and modified graphite are widely used as negative electrode materials in commercial lithium-ion batteries, but there are disadvantages such as low...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/386H01M4/628H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 宋宏芳赵东辉周鹏伟
Owner SHENZHEN XIANGFENGHUA TECH CO LTD
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