High-conductivity silicon-oxygen negative electrode material and application thereof

A negative electrode material and high conductivity technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor electronic conductivity, lower material performance, and difficulty in achieving results, so as to increase material capacity, increase electrical conductivity, and accelerate The effect of transmission

Pending Publication Date: 2020-04-21
LANXI ZHIDE ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, since the fast ion conductor is located in the inner layer, it is difficult to achieve the above effect
Patent application CN109119617A also adopts double-layer coating, the first coating layer includes a two-dimensional quinone aldehyde covalent organic framework material, and the second coating layer includes a fast-conducting ion material to improve the electronic and ion conduction of the coating layer effect and alleviate the volume expansion, but the fast ion conductor layer is located in the outer layer, which still cannot solve the problem o

Method used

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  • High-conductivity silicon-oxygen negative electrode material and application thereof
  • High-conductivity silicon-oxygen negative electrode material and application thereof

Examples

Experimental program
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Embodiment 1

[0027] Grind lithium metaphosphate in an ethanol solvent with a sand mill until the particle size is within 50nm, then add SiO powder with a particle size of 5 μm and pitch carbon source, mix evenly, and the pitch addition ratio ensures that the final carbon content is 4% to ensure The thickness of the carbon layer is 50nm, which is spray-dried and sintered and carbonized at 900°C for 2 hours to obtain the silicon-oxygen negative electrode material. Since the thickness of the carbon layer is consistent with the particle size of lithium metaphosphate, lithium metaphosphate can form a complete channel.

[0028] The obtained sample is prepared into a button half battery, and the specific steps include: mixing the silicon-oxygen negative electrode material with CMC (sodium carboxymethyl cellulose), Super P, and SBR (styrene-butadiene rubber) in a ratio of 96.2:1.2:1:1.6 Evenly, then add deionized water to adjust into a slurry, evenly coated on the copper foil, dried, rolled, cut i...

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Abstract

The invention provides a high-conductivity silicon-oxygen negative electrode material which comprises a silicon-based inner core and a coating layer formed on a surface of the silicon-based inner core. The coating layer comprises carbon and a fast ion conductor, and the fast ion conductor forms a complete ion transmission channel on the coating layer, is directly connected with the silicon-based inner core and extends to the surface of the coating layer. The fast ion conductor forms the complete ion channel in the coating layer so that the silicon-oxygen negative electrode material can give consideration to both electron conductivity and ion conductivity, meanwhile, an SEI film is stabilized, and a capacity and electrochemical performance of the material are effectively improved.

Description

technical field [0001] The invention belongs to the field of battery electrode materials, and in particular relates to a high-conductivity silicon-oxygen negative electrode material and its application. Background technique [0002] With the gradual increase in power consumption of consumer electronics such as mobile phones, and the requirements of electric vehicles for cruising range, lithium-ion batteries are forced to pursue higher energy density. At present, the commercialized anode materials are mainly graphite materials, whose specific capacity is close to the theoretical value (372mAh / g), and there is an urgent need for anode materials with higher specific capacity. Silicon-based anode materials have become recognized as the next-generation anode materials because of their extremely high specific capacity (3580mAh / g), low potential for lithium extraction and extraction, abundant reserves, and non-toxic and harmless. However, the large volume expansion (over 300%), un...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/62H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 陈青华房冰胡盼刘江平
Owner LANXI ZHIDE ADVANCED MATERIALS CO LTD
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