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Silicon-carbon negative electrode material and preparation method thereof

A negative electrode material, silicon carbon technology, applied in the field of silicon carbon negative electrode materials and its preparation, can solve the problems affecting the effect of graphene, the weak force of graphene sheets, and the impact on the capacity of silicon-based materials, etc., to achieve excellent cycle performance, Minimized hindrance and excellent effect of volume change

Active Publication Date: 2017-08-18
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, although the pure graphene material has a unique flexible two-dimensional planar structure, the force between the graphene sheets is weak, and it is difficult to effectively limit the volume change of the silicon-based material during the charging and discharging process, thereby affecting the graphite. At the same time, two-dimensional sheet graphene has a hindering effect on ion transport, which will affect the capacity of silicon-based materials.

Method used

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  • Silicon-carbon negative electrode material and preparation method thereof

Examples

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Embodiment 1

[0035] Embodiment 1 differs from Comparative Example 1 in that the present embodiment comprises the following steps:

[0036] Step 1, select the silicon particle that particle diameter is 100nm, the functionalized graphene sheet layer that sheet thickness is 3nm, sheet plane diameter is 0.1 μm is electronic conduction component (mass ratio between silicon particle and graphene is 99%) : 1); the functional group (including hydroxyl, carboxyl and carbonyl) content is 0.5% of the mass of the entire electron-conducting component, and the precursor is obtained after being uniformly mixed with a solvent;

[0037] Step 2, through the hydrothermal reaction, the graphene molecules of the electron-conducting components containing functional groups are cross-linked to form a strong bonding force to complete the construction of the conductive network, and at the same time fix the primary particles in the network structure; Through mechanical shearing (stirring), a structure in which prima...

Embodiment 2

[0040] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0041] Step 1, select the silicon particle that particle diameter is 100nm, the functionalized graphene sheet layer that sheet thickness is 3nm, sheet plane diameter is 0.1 μm is electronic conduction component (mass ratio between silicon particle and graphene is 99%) : 1); the functional group (including hydroxyl, carboxyl and carbonyl) content is 1% of the mass of the entire electron-conducting component, and the precursor is obtained after being uniformly mixed with a solvent;

[0042] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0043] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0044] Step 1, select the silicon particle that particle diameter is 100nm, the functionalized graphene sheet layer that sheet thickness is 3nm, sheet plane diameter is 0.1 μm is electronic conduction component (mass ratio between silicon particle and graphene is 99%) : 1); the functional group (including hydroxyl, carboxyl and carbonyl) content is 2% of the mass of the entire electron-conducting component, which is uniformly mixed with a solvent to obtain a precursor;

[0045] 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 particularly relates to a silicon-carbon negative electrode material. The particle diameter D1 of the silicon-carbon negative electrode material is 1 micron to 200 microns, the silicon-carbon negative electrode material comprises secondary particle structures, the secondary particles consist of primary particles and an electron conduction component, the particle diameters D2 of the primary particles are smaller than or equal to 0.5D1; the electron conduction component comprises graphene slice layers, and the primary particles and the graphene slice layers are uniformly dispersed; strong binding force exists among the graphene slice layers; a conductive network structure with flexibility can be constructed, and a silicon-based material is fixed in the network structure, so that the silicon-carbon negative electrode material with good performance 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): H01M4/36H01M4/583H01M4/62H01M4/60H01M10/0525
CPCH01M4/366H01M4/583H01M4/60H01M4/625H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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