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A kind of lithium-ion battery silicon composite negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of high gram capacity, good cycle performance, low expansion rate, etc., and achieve high capacity and cycle performance. Good, low expansion effect

Active Publication Date: 2017-06-06
RIGHTFUL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a silicon composite negative electrode material for lithium-ion batteries, which solves the problem that the existing carbonaceous or silicon-based negative electrode materials cannot simultaneously take into account high gram capacity, low expansion rate, and good cycle performance.

Method used

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  • A kind of lithium-ion battery silicon composite negative electrode material and preparation method thereof
  • A kind of lithium-ion battery silicon composite negative electrode material and preparation method thereof
  • A kind of lithium-ion battery silicon composite negative electrode material and preparation method thereof

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Embodiment 1

[0050] The lithium-ion battery silicon composite negative electrode material of the present embodiment includes a matrix mixture and a carbon layer coated on the surface of the matrix mixture; the matrix mixture includes the following components in parts by weight: 3 parts of nano-silicon, LiAlO 2 3 parts, 3 parts of hollow carbon spheres, 85 parts of modified artificial graphite. Wherein, the particle diameter of the nano-silicon is 50nm; the diameter of the hollow carbon sphere is 500nm, and the wall thickness is 70-100nm.

[0051] The silicon composite negative electrode material is granular; the particle diameter D50 is 8 μm; wherein, the thickness of the carbon layer is 0.5-2 μm. The mass ratio of the matrix mixture to the carbon layer is 100:5. The carbon layer includes carbon nanowires, carbon nanotubes and amorphous carbon; the mass percentage of the carbon nanowires in the carbon layer is 70%, and the balance is carbon nanotubes and amorphous carbon. The carbon nan...

Embodiment 2

[0059] The lithium-ion battery silicon composite negative electrode material of the present embodiment includes a matrix mixture and a carbon layer coated on the surface of the matrix mixture; the matrix mixture includes the following components in parts by weight: 1 part of nano-silicon, LiAlO 2 1 part, 1 part of hollow carbon sphere, 70 parts of modified natural graphite. Wherein, the particle size of the nano-silicon is 20nm; the diameter of the hollow carbon sphere is 300nm, and the wall thickness is 50-80nm.

[0060] The silicon composite negative electrode material is granular; the particle diameter D50 is 13 μm; wherein, the thickness of the carbon layer is 1-4 μm. The mass ratio of the matrix mixture to the carbon layer is 100:20. The carbon layer includes carbon nanowires, carbon nanotubes and amorphous carbon; the mass percentage of the carbon nanowires in the carbon layer is 80%, and the balance is carbon nanotubes and amorphous carbon. The carbon nanowire is sol...

Embodiment 3

[0066] The lithium-ion battery silicon composite negative electrode material of the present embodiment includes a matrix mixture and a carbon layer coated on the surface of the matrix mixture; the matrix mixture includes the following components in parts by weight: 5 parts of nano-silicon, LiAlO 2 5 parts, 5 parts of hollow carbon spheres, 95 parts of modified artificial graphite. Wherein, the particle diameter of the nano-silicon is 20nm; the diameter of the hollow carbon sphere is 800nm, and the wall thickness is 100-200nm.

[0067] The silicon composite negative electrode material is granular; the particle diameter D50 is 18 μm; wherein, the thickness of the carbon layer is 2˜5 μm. The mass ratio of the matrix mixture to the carbon layer is 100:30. The carbon layer includes carbon nanowires, carbon nanotubes and amorphous carbon; the mass percentage of the carbon nanowires in the carbon layer is 90%, and the balance is carbon nanotubes and amorphous carbon. The carbon na...

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Abstract

The invention discloses a lithium ion battery silicon composite negative electrode material and a preparation method thereof. The silicon composite negative electrode material comprises a matrix mixture and a carbon layer which is coated on the surface of the matrix mixture. The matrix mixture is composed of the following components in parts by weight: 1 to 5 parts of nano silicon, 1 to 5 parts of lithium-containing compound, 1 to 10 parts of hollow carbon sphere, and 70 to 95 parts of graphite. The capacity of the negative electrode material is increased by the nano silicon, the doped hollow carbon spheres reduce the expanding effect of silicon during the reaction process, and thus the conductivity and structure stability of the matrix material are both improved. The carbon layer, which is coated on the matrix surface, is used to connect different matrix parts. Each component in the matrix mixture cooperates with the carbon layer and generates a synergetic effect, so the silicon composite negative electrode material has the advantages of large capacity, strong ability of absorbing and maintaining liquid, low expansion rate, and good cycling performance, is capable of improving the comprehensive performance of lithium ion battery, and has a wind application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and specifically relates to a silicon composite negative electrode material for a lithium ion battery, and also relates to a preparation method for a silicon composite negative electrode material for a lithium ion battery. Background technique [0002] A lithium-ion battery is a secondary battery (rechargeable battery) that works primarily by moving lithium ions between the positive and negative electrodes. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. In general, the composition of a lithium-ion battery includes a positive electrode, a negative electrode, a separator, and an electrolyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/13H01M10/0525
CPCH01M4/13H01M4/364H01M4/62H01M10/0525Y02E60/10
Inventor 程先桃
Owner RIGHTFUL TECH
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