Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Negative electrode material and preparation method thereof, battery and terminal

A technology of negative electrode materials and carbon materials, which is applied in the fields of batteries and terminals, negative electrode materials and their preparation, can solve the problems of poor battery cycle performance, reduced surface activity of negative electrode materials, low structural strength, etc., and achieve high capacity, good cycle performance and The effect of safety performance and simple process

Active Publication Date: 2021-06-01
HUAWEI TECH CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, an embodiment of the present invention provides a negative electrode material, the surface of the negative electrode material has a cladding layer formed by compounding metal oxide and / or silicon oxide and carbon, and the cladding layer can effectively alleviate the volume expansion of the negative electrode material, Reduce the surface activity of the negative electrode material and have higher strength to solve the problem of poor battery cycle performance caused by the low strength of the carbon coating structure on the surface of the existing silicon-based negative electrode material to a certain extent

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
  • Negative electrode material and preparation method thereof, battery and terminal
  • Negative electrode material and preparation method thereof, battery and terminal
  • Negative electrode material and preparation method thereof, battery and terminal

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0060] Correspondingly, an embodiment of the present invention also provides a method for preparing an anode material, including:

[0061] Step (1): Mix the oxide precursor, carbon source precursor, and core material together, so that the oxide precursor and carbon source precursor form an oxide / carbon microsphere precursor in situ on the surface of the core material, and obtain a surface coating A core material coated with an oxide / carbon microsphere precursor; or

[0062] First mix the oxide precursor and the carbon source precursor to prepare the oxide / carbon microsphere precursor, and then coat the oxide / carbon microsphere precursor with the core material to obtain a surface-coated oxide / carbon microsphere precursor The core material of the body;

[0063] Step (2): After the core material whose surface is coated with the oxide / carbon microsphere precursor is subjected to a high-temperature carbonization treatment at 900° C. to 1100° C., the above-mentioned negative electr...

Embodiment 1

[0078] A SiO 1.5 The preparation method of the Si negative electrode material coated with / C microspheres, comprising:

[0079] (1) Mix 20 mL of ethanol and 10 mL of deionized water, weigh 0.3 g of resorcinol, put it into the ethanol / water mixed solution, and stir for 30 minutes to fully dissolve. Then add 1mL of ammonia water and 1mL of VTES (triethoxyvinylsilane) into it, stir evenly, and then add 0.42mL of 37%-40% formaldehyde solution. The above mixed solution turns into a white suspension after reacting at room temperature for 2-24 hours. Centrifuge, wash and dry the suspension to obtain SiO with a size of 100-800nm 1.5 / C microsphere precursor;

[0080] (2) SiO 1.5 / C microsphere precursor and D50=10μm core silicon are mixed at a mass ratio of 4:96, ball milled at 300rpm for 30min and taken out to obtain SiO 1.5 Silicon material coated with / C microsphere precursor;

[0081] (3) Introduce the material obtained in step (2) into a tube furnace under Ar atmosphere pro...

Embodiment 2

[0083] a kind of Al 2 o 3 The preparation method of the SiO negative electrode material coated with / C microspheres, comprising:

[0084] (1) Al(NO 3 ) 3 9H 2 O and citric acid are dissolved in water according to a certain ratio, and the pH of the solution is adjusted to about 2 with concentrated hydrochloric acid to obtain a transparent solution. Weigh a certain mass of core material SiO with D50 = 5 μm, disperse it in the above transparent solution, then add pyrrole solution to it, stir for 30 minutes to make it fully dispersed, and then add a certain proportion of FeCl to it 3 , continue to react for 6-24h. The reactants were separated by centrifugation or suction filtration, washed and dried with deionized water and ethanol several times to obtain Al 2 o 3 / C microsphere precursor coated SiO material;

[0085] (2) Introduce the material obtained in step (1) into a tube furnace under the protection of Ar atmosphere, heat up to 900°C at a heating rate of 5-10°C / min, ...

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
Login to View More

Abstract

A negative electrode material provided by the embodiment of the invention comprises an inner core and a coating layer coating the surface of the inner core. The inner core is a silicon-based material or a tin-based material, and the coating layer comprises a first carbon material and oxide / carbon microspheres dispersed in the first carbon material. The oxide / carbon microspheres are secondary particles formed by compounding nano oxide particles and a second carbon material, the nano oxide particles comprise one or more of metal oxide particles and silicon oxide particles, and the first carbon material and the second carbon material are continuously distributed to form a conductive carbon network. The coating layer can effectively relieve the volume expansion of the inner core and reduce the surface activity of the inner core, and has relatively high strength and relatively high electron and ion conductivity. The embodiment of the invention also provides a preparation method of the negative electrode material, and a battery and a terminal comprising the negative electrode material.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of lithium-ion batteries, in particular to negative electrode materials and preparation methods thereof, batteries and terminals. Background technique [0002] The theoretical specific capacity of silicon is 4200mAh / g, which is currently one of the most researched negative electrode materials that can replace graphite. However, silicon will experience severe volume expansion (0-300%) and shrinkage during the lithium-deintercalation reaction, which will lead to the destruction of the electrode structure, and a new SEI film (solid electrolyte interface, solid electrolyte interface) will continue to be formed on the silicon surface and the electrolyte. interfacial film), which leads to the depletion of the electrolyte and the rapid decay of the battery capacity. Moreover, most of the electrolytes currently use carbonates as solvents, and these solvents are easy to decompose on the ele...

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
IPC IPC(8): H01M4/62H01M4/38H01M10/0525H01M10/058C01B33/02C01B32/05C01B33/18C01F7/30B82Y30/00B82Y40/00
CPCH01M4/625H01M4/628H01M4/386H01M4/387H01M10/0525H01M10/058C01B33/02C01B33/18C01B32/05C01F7/30B82Y30/00B82Y40/00C01P2004/80C01P2006/40Y02P70/50Y02E60/10
Inventor 沙玉静王涛张新枝夏圣安
Owner HUAWEI TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com