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Silicon-carbon negative electrode material and preparation method thereof

A technology of negative electrode material and silicon carbon, which is applied to the field of silicon carbon negative electrode material and its preparation, can solve the problems such as the inability to protect the core structure, the fixed nuclear structure, the limited flexibility of the surface coating layer, and the influence on the performance of the silicon carbon negative electrode material. Achieve excellent ion conductivity, electrochemical performance, and tight adhesion

Inactive Publication Date: 2017-07-11
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to the huge volume expansion of the inner core structure layer during the charging process, and the limited flexibility of the surface coating layer itself, it is easy to be destroyed, which cannot protect the core structure and fix the core structure. Properties of Carbon Anode Materials

Method used

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  • Silicon-carbon negative electrode material and preparation method thereof

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Embodiment 1

[0036] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0037] Step 1. Evenly mix 100nm silicon particles, carbon nanotube conductive agent (silicon particle:conductive agent=9:1, mass ratio, the same below), and NMP to obtain a precursor slurry, and then spray and pelletize to obtain a silicon-based secondary particles;

[0038] Step 2. Mix super conductive carbon, glucose, 2-methyl-2-nitrosopropane (accounting for 1% of the volume of the solid component), and NMP to obtain a slurry;

[0039] Step 3. Coat the slurry obtained in step 2 on the surface of the core structure particles described in step 1, and then perform a foaming reaction to obtain a porous structure precursor coating layer, which is then carbonized to obtain a thickness of 500 nm and a porosity of 1%. buffer layer;

[0040] Step 4. Select asphalt as the coating material to coat the product of step 3. Since the product of step 3 has been carbonized, the s...

Embodiment 2

[0042] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0043] Step 2. Mix super conductive carbon, glucose, 2-methyl-2-nitrosopropane (accounting for 5% of the volume of the solid component), and NMP to obtain a slurry;

[0044] Step 3. Coat the slurry obtained in step 2 on the surface of the core structure particles described in step 1, and then perform a foaming reaction to obtain a porous structure precursor coating layer, which is then carbonized to obtain a thickness of 500 nm and a porosity of 5%. buffer layer;

[0045] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0046] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0047] Step 2. Mix super conductive carbon, glucose, 2-methyl-2-nitrosopropane (accounting for 10% of the volume of the solid component), and NMP to obtain a slurry;

[0048] Step 3. Coat the slurry obtained in step 2 on the surface of the core structure particles described in step 1, then perform a foaming reaction to obtain a porous structure precursor coating layer, and then carbonize to obtain a thickness of 500nm and a porosity of 10%. buffer layer;

[0049] Others are the same as in Example 1, and will not be repeated here.

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Abstract

The invention belongs to the field of energy storage research and relates to a silicon-carbon negative electrode material. The silicon-carbon negative electrode material comprises a core structure and a shell structure. A buffer layer is arranged between the core structure and the shell structure. The buffer layer is tightly connected to the surface of the core structure. The buffer layer is tightly connected to the inner surface of the shell structure. The buffer layer has a porous structure with porosity of 1% to 80%. The core structure and the shell structure are tightly connected by the buffer layer so that in the whole cycle, the core structure and shell structure of the silicon-carbon negative electrode material are closely linked together. The buffer layer having the sponge porous structure can effectively absorb volume expansion of the core structure in the charging process and relieve the expansion pressure of the shell structure so that the structure of the material is stable and the silicon-carbon negative electrode material having excellent electrochemical properties is obtained.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, in particular to a silicon-carbon negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth, and are widely used in various in portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: lighter weight, longer service life, etc.; in order to solve the above problems, it is necessary to find new electrode materials with better performance. [0003] The current commercial lithium-ion battery anode material is mainly graphite, but its theoretical capacity is only 372mAh g -1 , can no longer meet the urgent needs of users; therefore, the development of anode materials with higher specific capacity is imminent. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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