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Hollow-structure carbon and silicon negative pole material used for lithium ion battery, and preparation method of hollow-structure carbon and silicon negative pole material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as difficult to ensure rapid transmission of lithium ions and electrons, and achieve improved volume expansion, good cycle stability, and The effect of low swelling

Active Publication Date: 2018-07-06
MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hollow structure reduces the contact points between the nano-silicon and the carbon layer, making it difficult to ensure the rapid transmission of lithium ions and electrons.

Method used

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  • Hollow-structure carbon and silicon negative pole material used for lithium ion battery, and preparation method of hollow-structure carbon and silicon negative pole material
  • Hollow-structure carbon and silicon negative pole material used for lithium ion battery, and preparation method of hollow-structure carbon and silicon negative pole material

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Embodiment 1

[0034] Such as figure 1 As shown, the present embodiment provides a silicon-carbon negative electrode material with a hollow structure for lithium-ion batteries. The interior of the negative electrode material is a hollow structure, and the wall layer of the negative electrode material includes an inner wall and an outer wall, and the inner wall is made of nano-silicon 2 and the low-carbon residual carbon source 3 are homogeneously composited, and the outer wall is a carbon coating layer 1 formed by organic cracking carbon source;

[0035] The particle size of the nano-silicon 2 is 30nm;

[0036] The softening point of the low carbon residue carbon source 3 is <200°C, and the carbon residue rate is <40%;

[0037] The thickness of the outer wall is 0.1-10 μm;

[0038] The thickness of the inner wall is 1-8 μm.

[0039] In the negative electrode material, the mass percentage of nano-silicon is 41.2%, the mass percentage of the low-carbon residual carbon source is 18.7%, and t...

Embodiment 2

[0047] This embodiment provides a silicon-carbon negative electrode material with a hollow structure for lithium-ion batteries. The interior of the negative electrode material is a hollow structure, and the wall layer of the negative electrode material includes an inner wall and an outer wall, and the inner wall is made of nano-silicon and low residue. Carbon and carbon sources are formed by homogeneous compounding, and the outer wall is a carbon coating layer formed by organic cracking of carbon sources;

[0048] The particle size of the nano-silicon is 60nm;

[0049] The softening point of the low carbon residue carbon source is <200°C, and the carbon residue rate is <40%;

[0050] The thickness of the outer wall is 0.1-10 μm;

[0051] The thickness of the inner wall is 1-8 μm.

[0052] In the negative electrode material, the mass percentage of nano-silicon is 37.3%, the mass percentage of the low carbon residue carbon source is 34.9%, and the mass percentage of the carbon...

Embodiment 3

[0060] This embodiment provides a silicon-carbon negative electrode material with a hollow structure for lithium-ion batteries. The interior of the negative electrode material is a hollow structure, and the wall layer of the negative electrode material includes an inner wall and an outer wall, and the inner wall is made of nano-silicon and low residue. Carbon and carbon sources are formed by homogeneous compounding, and the outer wall is a carbon coating layer formed by organic cracking of carbon sources;

[0061] The particle size of the nano-silicon is 30nm;

[0062] The softening point of the low carbon residue carbon source is <200°C, and the carbon residue rate is <40%;

[0063] The thickness of the outer wall is 0.1-10 μm;

[0064] The thickness of the inner wall is 1-8 μm.

[0065] In the negative electrode material, the mass percentage of nano-silicon is 22.1%, the mass percentage of the low carbon residue carbon source is 44.5%, and the mass percentage of the carbon...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a hollow-structure carbon and silicon negative pole material used for a lithium ion battery. The inner side of the negative pole material is of a hollow structure, and a wall layer of the negative pole material comprises an inner wall and an outer wall; the inner wall is subjected to homogeneous phase compounding by nanometer silicon and a low carbon residue carbon source; the outer wall is a carbon coating layer formed by an original pyrolysis carbon source; the particle size of the nanometer silicon is 5-300nm; the softening point of the low carbon residue carbon source is less than 200DEG C, and a carbon residue rate is less than 40%; the thickness of the outer wall is 0.1-10 microns; thethickness of the inner wall is 1-8 microns. The invention designs the large hollow-structure carbon and silicon negative pole material used for the lithium ion battery, a large hollow part is reservedfor the volume expansion of silicon, the volume expansion problem of a silicon negative pole can be obviously solved, the formation of the large hollow structure is guaranteed by the low carbon residue carbon source, meanwhile, the nanometer silicon is subjected to homogeneous phase dispersion, a transmission channel and rate of electrons and lithium ions can be guaranteed, and the carbon coatinglayer coats the outmost layer so as to form a protection shell for isolating electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a hollow-structure silicon-carbon negative electrode material for lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, small self-discharge, no memory effect, wide operating voltage range, long service life, and no environmental pollution. They are currently the main power source for new energy vehicles. The key electrode material of lithium-ion battery is the final decisive factor of battery performance, and the negative electrode material plays a vital role in improving the performance of lithium-ion battery. However, the specific capacity of the traditional graphite negative electrode is close to the theoretical value of 372mAh / g, and there is little room for improvement. Therefore, the development of new high-performance electrode materials has become a research hots...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 秦军张少波王海帆
Owner MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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