Composite nano-silicon negative electrode and preparation and application thereof

A technology of nano-silicon and negative electrode, which is applied in the field of composite nano-silicon negative electrode and its preparation and application. It can solve the problems of battery cycle performance degradation, silicon-containing negative electrode materials are easy to expand and have low conductivity, and achieve harmony uniformity and good electrolyte infiltration. Sexuality and flexibility, the effect of mitigating direct contact

Inactive Publication Date: 2020-11-03
黄杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a composite nano-silicon negative electrode, to solve the problem in the prior art that the silicon-containing negative electrode material is easy to exp

Method used

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  • Composite nano-silicon negative electrode and preparation and application thereof
  • Composite nano-silicon negative electrode and preparation and application thereof
  • Composite nano-silicon negative electrode and preparation and application thereof

Examples

Experimental program
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Example Embodiment

[0033] Example 1:

[0034] Under an inert atmosphere, in percentage by mass of nano crystalline silicon: carbon nanotubes: polymeric monomer = 80%: 5%: 15% Weigh 10g total mass, wherein the polymer is a styrene monomer by: methacrylic acid: cis-butanediol acid = 3: 3: 4 then transfers the above-described materials are added stir 72g of isopropanol, 0.5% ammonium persulfate initiator concentration, 80 deg.] C was stirred for 3h, IH broken, after vacuum pump drying to obtain a three-dimensional nano-silicon composite negative electrode material.

Example Embodiment

[0035] Example 2:

[0036] Under an inert atmosphere, in percentage by mass of the amorphous porous silicon nano: acetylene black: polymeric monomer = 85%: 5%: 10% Weigh 20g total mass, wherein the polymer of the acrylic monomers: methyl methacrylate = 3 : 7 calculation, then 142g the above materials were added to stir dimethoxyethane, bisphenol A initiator, stirring 4h 70 ℃, IH sand, heated to obtain three-dimensional silicon composite negative electrode material after drying.

Example Embodiment

[0037] Example 3:

[0038] Under an inert atmosphere, in percentage by mass crystalline carbon-coated nano silicon: graphite: PVDF = 84%: 3%: 13% 8g materials were weighed, added 66gN- methylpyrrolidone, and then ball milling the above materials was stirred, by spray drying after the three-dimensional composite silicon anode material.

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Abstract

The invention discloses a composite nano-silicon negative electrode material and preparation and application thereof, and belongs to the technical field of lithium ion batteries. The composite nano-silicon negative electrode material comprises nano-silicon, a three-dimensional electron conduction skeleton and a polymer, and the nano silicon is uniformly dispersed in the three-dimensional electronconduction skeleton and the polymer. The basic principle of the composite negative electrode material is that the nano-silicon, the three-dimensional electron conduction skeleton and the polymer are uniformly mixed and dispersed, then the composite three-dimensional nano-silicon negative electrode material is obtained by methods of granulation, drying and the like, the nano-silicon, the polymer and the three-dimensional electron conduction skeleton are uniformly distributed, and the three-dimensional electron conduction skeleton and the polymer have the properties of absorbing electrolyte andmaintaining an ion channel, so that excellent ion conductivity and electron conductivity of the composite nano silicon negative electrode material during working in a lithium ion battery are ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a composite nano-silicon negative electrode and its preparation and application. Background technique [0002] Rechargeable metal-ion batteries mainly include lithium-ion batteries, sodium-ion batteries, potassium-ion batteries, etc. Among them, lithium-ion batteries are the most mature and widely used, and have been widely used in consumer electronics, energy storage systems, and power systems. It is widely used, but how to improve its energy density has become one of the technical bottlenecks restricting its further application and development. [0003] The theoretical capacity of existing graphite anode materials is 372mAh / g, among which commercial graphite anode products have reached about 350mAh / g, and there is basically no room for improvement. The theoretical capacity of silicon as the anode material of lithium-ion batteries can reach about 4200mAh / g, and th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/362H01M4/386H01M4/62H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 黄杰
Owner 黄杰
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