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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 materials, can solve the problems affecting the capacity of silicon-based materials, hindering the insertion of lithium ions and nano-silicon-based materials, and achieving the effect of reducing the hindrance effect

Active 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 unique flexible two-dimensional planar structure of graphene materials, its sheets are very easy to wrap nano-sized silicon-based particles inside, thus hindering the intercalation between lithium ions and nano-silicon-based materials during charging and discharging. , affecting the capacity of silicon-based materials

Method used

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  • Silicon-carbon negative electrode material and preparation method thereof

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Embodiment 1

[0032] Embodiment 1 differs from Comparative Example 1 in that the present embodiment comprises the following steps:

[0033] Step 1, select the silicon particle that particle diameter is 100nm, sheet thickness is 3nm, the porous graphene sheet layer that sheet plane diameter is 50 μ m is conductive agent component (mass ratio between silicon particle and graphene is 99:1 ); the hole diameter of the porous graphene is 1 μm, and the width d1 of the continuous part between the two holes is about 5 μm;

[0034] Others are the same as those of Comparative Example 1 and will not be repeated here.

Embodiment 2

[0035] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0036] Step 1, select the silicon particle that particle diameter is 100nm, sheet thickness is 3nm, the porous graphene sheet layer that sheet plane diameter is 50 μ m is conductive agent component (mass ratio between silicon particle and graphene is 99:1 ); the hole diameter of the porous graphene is 1 μm, and the width d1 of the continuous part between the two holes is about 1 μm;

[0037] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0038] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0039] Step 1, select the silicon particle that particle diameter is 100nm, sheet thickness is 3nm, the porous graphene sheet layer that sheet plane diameter is 50 μ m is conductive agent component (mass ratio between silicon particle and graphene is 99:1 ); the hole diameter of the porous graphene is 1 μm, and the width d1 of the continuous part between the two holes is about 0.5 μm;

[0040] 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 silicon-carbon negative electrode material has a particle diameter D1 of 1 to 200 microns. The silicon-carbon negative electrode material has a secondary particle structure. The secondary particle is composed of a primary particle and an electron conduction component. The primary particle has a particle diameter D2 less than or equal to 0.5D1. The electron conduction component comprises a graphene sheet layer. The primary particles and the graphene sheet layers are uniformly dispersed. The graphene is porous graphene. The porous graphene sheet layer has thickness h1 less than or equal to 100 nm and a pore diameter D3. The width d1 of the continuous portion between the two pores is less than or equal to 0.5D1. Through the porous graphene, ions freely pass through two surfaces of graphene. The width of the continuous portion between the two pores does not exceed the radius of the secondary particle structure so that the two-dimensional graphene sheet has low inhibition effects on ion diffusion.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates 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. As a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/485H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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