Lithium-ion battery silicon-carbon composite anode material and preparation method thereof

A lithium-ion battery and silicon-carbon composite technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of poor cycle performance of lithium-ion batteries, failure to reduce the volume expansion effect of silicon-carbon lithium-ion battery negative electrode composite materials, and lack of freedom Problems such as space expansion and contraction, to achieve good electrical contact, reduce the expansion effect, and reduce the expansion rate of the pole piece

Active Publication Date: 2015-10-28
王凤鸣
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  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a silicon-carbon composite negative electrode material for a lithium-ion battery, aiming at solving the problem that the existing silicon-carbon lithium-ion negative electrode material has a dense structure and no free space to absorb the expansion and contraction of silicon during battery charging and discharging. The volume expansion effect produced by the negative electrode composite material of silicon-carbon lithium-ion batteries cannot be reduced, resulting in the problem of poor cycle performance of lithium-ion batteries

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  • Lithium-ion battery silicon-carbon composite anode material and preparation method thereof
  • Lithium-ion battery silicon-carbon composite anode material and preparation method thereof
  • Lithium-ion battery silicon-carbon composite anode material and preparation method thereof

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preparation example Construction

[0034] Correspondingly, the embodiment of the present invention also provides a method for preparing a silicon-carbon composite negative electrode material for a lithium-ion battery, comprising the following steps:

[0035] S01. Prepare nano-silicon / graphene sheets, disperse the nano-silicon / graphene sheets in an organic solvent and then sand them to obtain a nano-silicon / graphene sheet solution; soft carbon precursor or soft carbon precursor and carbon material A are added to the nano-silicon / graphene sheet solution, mixed and treated, sprayed and granulated to obtain a nuclear precursor compound I; the nuclear precursor compound I is heat-treated to obtain the lithium-ion battery silicon A core of a carbon composite negative electrode material, wherein the heat treatment method is: heating at a constant temperature at 500-950°C for 1-5 hours;

[0036] S02. The core and the carbon material B precursor are respectively dispersed in a solvent, mixed, spray-dried to obtain a com...

Embodiment 1

[0063] A silicon-carbon composite negative electrode material for a lithium-ion battery, the silicon-carbon composite negative electrode material for a lithium-ion battery includes a core-shell structure, the core includes a nano-silicon / graphene sheet, soft carbon, and the core is a soft carbon precursor and the nano-silicon / graphene sheet and soft carbon composite particles obtained after heat treatment of the nano-silicon / graphene sheet, wherein the soft carbon is attached to the surface of the nano-silicon / graphene sheet, and the nano-silicon / graphene sheet There are free spaces between the graphene sheets;

[0064] The shell is composed of carbon material B and nano carbon, and the carbon material B and nano carbon are coated on the surface of the core in turn.

[0065] The preparation method of the above lithium-ion battery silicon-carbon composite negative electrode material comprises the following steps:

[0066] S11. The nucleus of a silicon-carbon composite negative...

Embodiment 2

[0078] A silicon-carbon composite negative electrode material for a lithium-ion battery, the silicon-carbon composite negative electrode material for a lithium-ion battery comprises a core-shell structure, the core includes a nano-silicon / graphene sheet, soft carbon and carbon material A, and the core is The soft carbon precursor, the carbon material A and the nano-silicon / graphene sheet obtained after heat treatment, the carbon material A, and the soft carbon composite particles, wherein the soft carbon is attached to the Nano-silicon / graphene sheet and the surface of the carbon material A, and between the nano-silicon / graphene sheet, between the nano-silicon / graphene sheet and the carbon material A, and between the carbon material A have free space;

[0079] The shell is composed of carbon material B and nano carbon, and the carbon material B and nano carbon are coated on the surface of the core in sequence.

[0080] The preparation method of the above lithium-ion battery s...

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Abstract

The invention belongs to the field of lithium-ion battery anode materials, and provides a lithium-ion battery silicon-carbon composite anode material and a preparation method thereof. The lithium-ion battery silicon-carbon composite anode material comprises a core-shell structure and is characterized in that a core comprises nano silicon/graphene sheets and soft carbon, and the core is the nano silicon/graphene sheets and soft carbon composite particles which are obtained by performing heat treatment on a soft carbon precursor and the nano silicon/graphene sheets, the soft carbon is attached to the surfaces of the nano silicon/graphene sheets, and free spaces are formed among the nanometer silicon/graphene sheets; the shell is composed of a second carbon material and nano carbon which are coated on the surface of the core sequentially.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, in particular to a silicon-carbon composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] As an energy storage device, lithium-ion batteries are widely used in various fields, such as electronic products, energy storage base stations, electric vehicles, etc., and are currently the most widely used energy storage devices. However, with the development of society and the continuous innovation of science and technology, people have higher and higher requirements for the energy storage performance of lithium-ion batteries, and they urgently hope that lithium-ion batteries have higher energy density and longer life. At present, the anode materials in commercial lithium-ion batteries are mainly graphite materials, and the theoretical capacity of graphite materials is 372mAh / g, which limits the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/1393H01M4/1395H01M4/362H01M4/386H01M10/0525Y02E60/10
Inventor 钟辉慈立杰丁显波石佳光夏进阳杨杰茆胜
Owner 王凤鸣
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