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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 expand and the conductivity is low, and the battery cycle performance is reduced. In addition, the preparation The anode material produced has excellent properties such as high specific capacity and long cycle life, and can realize the industrial production of lithium-ion batteries

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

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Embodiment 1

[0034] Under an inert atmosphere, take a total of 10g of material according to the mass percentage of crystalline nano-silicon: carbon nanotube: polymer monomer = 80%: 5%: 15%, wherein the polymer monomer is based on styrene: methacrylic acid: butadiene Acrylic acid = 3:3:4, then add the above materials into 72g of isopropanol and stir evenly, add 0.5% concentration of ammonium persulfate initiator, stir at 80°C for 3 hours, crush for 1 hour, and vacuum-dry to obtain a three-dimensional Nano silicon composite anode material.

Embodiment 2

[0036] Under an inert atmosphere, a total of 20g of materials is weighed according to the mass percentage of amorphous porous nano-silicon: acetylene black: polymer monomer = 85%: 5%: 10%, wherein the polymer monomer is based on acrylic acid: methyl methacrylate = 3 : 7 calculations, then the above-mentioned materials were added in 142g dimethoxyethane and stirred evenly, bisphenol A initiator was added, stirred at 70°C for 4h, sand milled for 1h, and heated and dried to obtain a three-dimensional nano-silicon composite negative electrode material.

Embodiment 3

[0038] Under an inert atmosphere, according to the mass percentage of crystalline carbon-coated nano-silicon: graphite: polyvinylidene fluoride = 84%: 3%: 13%, a total of 8g of material was weighed, added to 66g of N-methylpyrrolidone, and then the above-mentioned material was ball milled and stirred. The three-dimensional nano-silicon composite negative electrode material can be prepared after spray drying.

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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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