Unlock instant, AI-driven research and patent intelligence for your innovation.

Silicon-based composite negative electrode material, preparation method thereof and electrochemical energy storage device

A negative electrode material, a technology of silicon-based materials, applied in the field of electrochemical energy storage devices, silicon-based composite negative electrode materials and their preparation, can solve the problem of poor rate performance and cycle performance, poor ion conductance and electronic conductance, and no toughness of silicon anode materials and other problems to achieve the effect of avoiding the loss of active lithium, reducing the interface resistance and improving the binding force

Pending Publication Date: 2022-04-26
EVE ENERGY CO LTD
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, alumina, as an inorganic coating, has no toughness and is easily broken during the expansion process of the silicon anode, and the ionic and electronic conductivities of alumina are poor, resulting in poor rate performance and cycle performance of the silicon anode material.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Silicon-based composite negative electrode material, preparation method thereof and electrochemical energy storage device
  • Silicon-based composite negative electrode material, preparation method thereof and electrochemical energy storage device
  • Silicon-based composite negative electrode material, preparation method thereof and electrochemical energy storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a silicon-based composite negative electrode material, figure 1 It is a structural representation of the silicon-based composite negative electrode material in Example 1, as figure 1 As shown, the silicon-based composite negative electrode material includes silicon oxide with an average particle size of 7 μm and a polymer layer coated on the surface of silicon oxide; the polymer layer includes cis-propenyl phosphoric acid-lithium p-styrenesulfonate Copolymer, thickness 20nm.

[0047] The preparation method comprises the following steps:

[0048] Mix cis-propenyl phosphoric acid with a molar ratio of 60:40, lithium p-styrenesulfonate, azobisisobutyronitrile initiator and toluene, wherein, based on the total mass of monomers as 100%, azobisisobutyronitrile The mass percentage of the nitrile initiator is 0.4%. After reacting at 80°C for 8 hours in an argon atmosphere, methanol is added to precipitate the solvent to obtain a polymer precipitate, w...

Embodiment 2

[0050] This embodiment provides a silicon-based composite negative electrode material, the silicon-based composite negative electrode material includes silicon oxide with an average particle size of 5 μm and a polymer layer coated on the surface of silicon oxide; the polymer layer includes Allyl phosphoric acid-lithium p-styrene sulfonate copolymer, thickness 55nm.

[0051] The preparation method comprises the following steps:

[0052] Mix cis-propenyl phosphoric acid with a molar ratio of 40:60, lithium p-styrenesulfonate, azobisisobutyronitrile initiator and toluene, wherein, based on the total mass of monomers as 100%, azobisisobutyronitrile The mass percentage of the nitrile initiator is 0.5%. After reacting at 80°C for 8 hours in an argon atmosphere, add methanol to separate out the solvent to obtain a polymer precipitate, wash and dry to obtain cis-propenyl phosphoric acid-lithium p-styrenesulfonate copolymer Then dissolve the cis-propenyl phosphoric acid-lithium p-styr...

Embodiment 3

[0054] This embodiment provides a silicon-based composite negative electrode material. The silicon-based composite negative electrode material includes silicon oxide with an average particle size of 3 μm and a polymer layer coated on the surface of silicon oxide; the polymer layer includes Allyl phosphoric acid-lithium p-styrene sulfonate copolymer, thickness 30nm.

[0055] The preparation method comprises the following steps:

[0056] The molar ratio is 50:50 cis-propenyl phosphoric acid and p-styrene sulfonate lithium, azobisisoheptanonitrile initiator and N-methylpyrrolidone are mixed, wherein, the total mass of the monomer is 100%, The mass percentage of azobisisobutyronitrile initiator is 0.2%. After reacting at 70°C for 10 hours in an argon atmosphere, add acetone to precipitate the solvent to obtain a polymer precipitate, wash and dry to obtain cis-propenyl phosphoric acid-p-styrene Lithium sulfonate copolymer, then dissolving cis-propenyl phosphoric acid-p-styrene sul...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a silicon-based composite negative electrode material, a preparation method thereof and an electrochemical energy storage device. The silicon-based composite negative electrode material comprises a silicon-based material and a polymer layer coating the surface of the silicon-based material, the polymer layer comprises a cis-propenyl phosphate-lithium p-styrenesulfonate copolymer. According to the polymer layer coated silicon-based composite negative electrode material provided by the invention, the cis-propenyl phosphoric acid-lithium p-styrenesulfonate copolymer can be used as a buffer layer for volume expansion of the silicon-based material, so that the volume expansion of the silicon-based material is well buffered, and a lithium ion battery keeps good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a silicon-based composite negative electrode material, a preparation method thereof, and an electrochemical energy storage device. Background technique [0002] The current commercial anode materials are graphite materials. The theoretical specific capacity of graphite is as high as 372mAh / g. However, with further in-depth research on graphite, researchers found that the specific capacity of high-performance graphite materials can reach 360-365mAh / g, which is very close to the theoretical specific capacity of graphite negative electrodes. In this case, it is difficult for graphite materials to meet the increasing demand for higher energy density of the anode. Silicon-based materials have attracted much attention because of their theoretical specific capacity of up to 4200mAh / g. In addition, silicon-based materials have the advantages of wide sources, hig...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/60H01M10/0525
CPCH01M4/366H01M4/386H01M4/606H01M10/0525H01M2004/027Y02E60/10
Inventor 谢英朋冀亚娟陈俊霖
Owner EVE ENERGY CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com