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

Preparation method for silicon-carbon negative electrode material doped with nickel-silver alloy particles

A technology of nickel-silver alloy and granular silicon, which is applied in the field of preparation of silicon-carbon anode doped with nickel-silver alloy particles, can solve the problems of low material production efficiency, low initial Coulombic efficiency, unfavorable industrial production, etc., and achieve sufficient supply and improved The effect of the first efficiency and low equipment cost

Inactive Publication Date: 2020-02-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
View PDF9 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the following problems still exist in the preparation of silicon carbon anode materials: ① low initial coulombic efficiency; ② short cycle life; ③ poor rate performance; ④ low material production efficiency; ⑤ high cost of raw materials, which is not conducive to industrial production

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
  • Preparation method for silicon-carbon negative electrode material doped with nickel-silver alloy particles
  • Preparation method for silicon-carbon negative electrode material doped with nickel-silver alloy particles
  • Preparation method for silicon-carbon negative electrode material doped with nickel-silver alloy particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 of the present invention provides a method for preparing a silicon-carbon negative electrode doped with nickel-silver alloy particles, including the following steps:

[0034] (1) Add D50=8~10μm polysilicon and zirconia balls into the zirconia ball milling tank according to the mass ratio of 1:4, use n-hexane as the solvent, rotate forward at 300r / min for 30min, and then let it stand for 5min. Reverse at 300r / min for 30min, continue to stand still for 5min, and then continue to rotate forward, so reciprocating, meeting the total ball milling time of 12h. After the ball milling is completed, zirconia balls and silicon powder are separated through a sieve to obtain nano-sized silicon powder.

[0035] (2) Preparation of nickel-silver alloy: nickel powder and silver powder are added in a ball mill tank according to a mass ratio of 1:3, zirconia balls are added, and n-hexane is used as a solvent, placed in a high-energy mechanical ball mill, and ball milled for 9...

Embodiment 2

[0042] Embodiment 2 of the present invention provides a method for preparing a nickel-silver alloy-doped silicon-carbon negative electrode material, which includes the following steps.

[0043](1) Add polysilicon and zirconia balls with D50=8~10μm into the zirconia ball milling tank according to the mass ratio of 1:3, use n-hexane as the solvent, rotate forward at 200r / min for 30min, then let stand for 5min, and the stand is completed Then reverse at 200r / min for 30 minutes, continue to stand still for 5 minutes, and then continue to rotate forward, so reciprocating, meeting the total ball milling time of 14 hours. After the ball milling is completed, zirconia balls and silicon powder are separated through a sieve to obtain nano-sized silicon powder.

[0044] (2) Preparation of nickel-silver alloy: nickel powder and silver powder are added to the ball mill tank according to the mass ratio of 1:1, zirconia balls are added, and n-hexane is used as a solvent, placed in a high-ene...

Embodiment 3

[0051] Embodiment 3 of the present invention provides a method for preparing a nickel-silver alloy-doped silicon-carbon negative electrode material, which includes the following steps.

[0052] (1) Add polysilicon and zirconia balls with D50=8~10μm into the zirconia ball milling tank according to the mass ratio of 1:3, use n-hexane as the solvent, rotate forward at 400r / min for 30min, then let stand for 5min, and the stand is completed Then reverse at 400r / min for 30min, continue to stand still for 5min, and then continue to rotate forward, so reciprocating, meeting the total ball milling time of 16h. After the ball milling is completed, zirconia balls and silicon powder are separated through a sieve to obtain nano-sized silicon powder.

[0053] (2) Preparation of nickel-silver alloy: nickel powder and silver powder are added in a ball mill jar according to the mass ratio of 1:5, zirconia balls are added, and n-hexane is used as a solvent, placed in a high-energy mechanical ba...

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

No PUM Login to View More

Abstract

The invention relates to the field of lithium batteries, and discloses a method of preparing a silicon-carbon negative electrode material by doping nickel-silver alloy particles, which comprises the following steps of: (1) carrying out ball milling on raw material micron-sized silicon powder to prepare nanoscale silicon powder, (2) mutual mixing of the nanoscale silicon powder and the nickel-silver alloy particles and adopting a solid-phase mixing method, (3) forming an amorphous carbon coating layer on the surfaces of the nano silicon powder and the nickel-silver alloy by adopting liquid-phase coating, (4) carrying out high-temperature sintering on the coating material in an inert gas protection furnace, (5) preparing a silicon-carbon material with proper granularity by adopting a mechanical ball milling method, and (6) mixing the silicon-carbon material and commercial graphite to prepare the silicon-carbon negative electrode material. According to the preparation method, the first coulombic efficiency and the cycle performance of the material are obviously improved, the process is simple, efficient and environmentally friendly, and large-scale production of the silicon-carbon negative electrode material is facilitated.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for preparing a silicon-carbon negative electrode doped with nickel-silver alloy particles and an application of the material to the negative electrode of a lithium-ion battery. Background technique [0002] The energy crisis and environmental problems in contemporary society are becoming more and more serious, and it is extremely urgent to find a new type of clean energy. As a power battery with long cycle life, high power density, low self-discharge rate and green environmental protection, lithium-ion battery has ushered in new opportunities, but also faces great challenges. At present, the energy density and cruising range of power lithium-ion batteries are difficult to meet the needs of electric vehicles. [0003] At this stage, graphite is the most widely used lithium-ion battery, and its theoretical specific capacity is only 372mAh / g, which is difficult to meet th...

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): H01M4/36H01M4/38H01M4/583H01M10/0525B82Y30/00
CPCH01M4/366H01M4/386H01M4/38H01M4/583H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 刘超辉林少雄许家齐丁楚雄
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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