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Silicon monoxide composite material, electrode, lithium ion battery and preparation method and application thereof

A technology of silicon oxide and composite materials, applied in the direction of lithium batteries, hybrid capacitor electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of poor rate performance and cycle performance, and achieve stable performance, excellent cycle performance, and high initial Coulombic efficiency Effect

Pending Publication Date: 2021-04-27
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects of poor rate performance and cycle performance of batteries using silicon oxide materials as electrodes in the prior art, the present invention provides a silicon oxide composite material, an electrode, a lithium ion battery and its preparation method and application

Method used

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  • Silicon monoxide composite material, electrode, lithium ion battery and preparation method and application thereof
  • Silicon monoxide composite material, electrode, lithium ion battery and preparation method and application thereof
  • Silicon monoxide composite material, electrode, lithium ion battery and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0072] A preparation method of silicon oxide composite material, comprising the following steps:

[0073] S1. Homogenization: Mix 800 parts of NMP solvent, 100 parts of silicon oxide, and 3 parts of lithium carbonate, and stir in a high-speed disperser for 0.5 hours;

[0074] Then sand mill in a pin-rod dynamic separation high-energy sand mill until the particle size of silicon oxide and lithium carbonate is 1 μm; the sand mill uses yttrium oxide stabilized zirconia balls with a diameter of 0.2 mm, and the speed adopts 98% of the design speed of the equipment ;

[0075] Then add 0.05 part of single-walled carbon nanotube-NMP slurry (by carbon nanotube), 0.05 part of graphene-NMP slurry (by graphene) and sand mill 1 hour again;

[0076] Then add 20 parts of novolac resin, 1.2 parts of hexamethylenetetramine, 0.4 parts of PVA 1788, 0.4 parts of PVPK30, and sand again for 2 hours, and adjust the viscosity of the slurry to 10mPa·s by adding NMP during sand grinding;

[0077] Fin...

Embodiment 2

[0083] Except that silicon oxide and lithium carbonate were ground in a pin-type dynamic separation high-energy sand mill in step S1 until the particle size of silicon oxide and lithium carbonate was 0.5 μm, other steps and conditions were the same as in Example 1.

Embodiment 3

[0085] Except for adding 0.1 part of single-walled carbon nanotube-NMP slurry (calculated as carbon nanotubes) in step S1, other steps and conditions are the same as in Example 1.

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Abstract

The invention discloses a silicon monoxide composite material, an electrode, a lithium ion battery and a preparation method and application thereof. The preparation method comprises the following steps of S1, homogenizing raw materials to obtain slurry, wherein the raw materials comprise the following components in parts by weight: 100 parts of silicon monoxide, 0.005-1 part of carbon nanotubes, 0-10 parts of a lithium supplementing additive, 10-200 parts of resin and a solvent, and homogenizing comprises sanding, S2, performing spray drying on the slurry to obtain a precursor A, S3, performing heat treatment on the precursor A to obtain a precursor B, S4, mixing the precursor B and a coating agent for coating treatment to obtain a precursor C, and S5, carrying out heat treatment on the precursor C. A lithium ion battery taking the silicon monoxide composite material prepared by the method as a negative electrode material has high capacity, high first effect, excellent rate capability and cycle performance, the preparation method is simple, and industrial large-scale production can be realized.

Description

technical field [0001] The invention relates to a silicon oxide composite material, an electrode, a lithium ion battery and a preparation method and application thereof. Background technique [0002] Due to its high energy density, long cycle life, convenient structural design, and environmental friendliness, lithium-ion batteries are widely used in various industries, production, and living fields such as communications, electronics, transportation, and energy storage. With the discovery of electronic science and technology, electronics and electrical appliances have higher and higher requirements for power supply. Traditional electrochemical energy storage devices are difficult to meet the needs of new electronic devices. The special feature is that the mileage anxiety faced by environmentally friendly new energy vehicles has become a key factor restricting the development of new energy vehicles. However, with the continuous research and development and progress in the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/131H01M10/052H01M10/0525H01G11/24H01G11/30H01G11/36H01G11/50
CPCH01M4/366H01M4/483H01M4/62H01M4/625H01M4/628H01M4/131H01M10/0525H01M10/052H01G11/24H01G11/30H01G11/36H01G11/50Y02E60/10
Inventor 潘福森童磊沈龙孙宝利聂顺军李虹
Owner NINGBO SHANSHAN NEW MATERIAL TECH