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

Secondary lithium cell having negative pole of carbon with deposited nanomter alloy on its surface

A secondary lithium battery, surface deposition technology, applied in secondary batteries, lithium batteries, nanotechnology for materials and surface science, etc., can solve the problems of loss of kinetic advantages, long-term cycle deterioration, etc., to achieve electrode Inexpensive materials, high current charge and discharge resistance, and good cycle performance

Inactive Publication Date: 2004-05-26
INST OF PHYSICS - CHINESE ACAD OF SCI
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, further studies have shown that due to the large surface energy of the ultrafine alloy anode material, it will gradually agglomerate during the charging and discharging process to form particles with a size of up to microns, resulting in poor long-term cycle performance and loss of kinetic advantages, such as References [8] Li Hong, Huang Xuejie, Chen Liquan, Solid State Ionics, 2000, published (H.Li, X.J.Huang, L. Q.Chen, SolidState Ionics, 2000, in press)

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
  • Secondary lithium cell having negative pole of carbon with deposited nanomter alloy on its surface
  • Secondary lithium cell having negative pole of carbon with deposited nanomter alloy on its surface
  • Secondary lithium cell having negative pole of carbon with deposited nanomter alloy on its surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In order to study the electrochemical performance of the carbon material deposited on the surface of the nano-alloy of the present invention as the negative electrode active material of the secondary lithium battery, an experimental battery is used for research. The experimental battery structure is as figure 1 shown. Among them, 1 is a stainless steel sealing nut, 2 is a polytetrafluoroethylene nut, 3 is a stainless steel spring, 4 is a working electrode with a carbon material deposited on the surface of nano-metal or alloy as the active material, and 5 is a porous polypropylene diaphragm Celgard  2300 (soaked in electrolyte), 6 is the counter electrode of metal lithium sheet, 7 is the measuring wire. The electrolyte is 1 mole lithium hexafluorophosphate (LiPF 6 ) was dissolved in a mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC) (1:1 by volume).

[0033] The preparation method of the active material of working electrode in the present embodimen...

Embodiment 2

[0039] According to the synthesis method described in Example 1, it is 30% carbon composite material that the nano-alloy accounts for the weight percentage of the composite material, and the average grain size of the SnSb alloy observed by scanning electron microscope is 80nm, and the ratio of the free SnSb alloy accounted for the whole alloy is lower than 15%. The obtained product has an oxygen content of less than 2% through elemental analysis. The X-ray diffraction pattern of the composite material is shown in figure 2 , and its scanning electron microscope photo is shown in image 3 . Its structure and morphology are typical of such carbon / nanoalloys.

[0040] The composite carbon powder in this example, carbon black and N-methylpyrrolidone solution of polyvinylidene fluoride are mixed at normal temperature and pressure to form a slurry, which is evenly coated on the copper foil substrate, and the thickness of the obtained film is about 100 μm. After drying the compos...

Embodiment 3

[0043] According to the synthesis method described in Example 1, the control reaction temperature is 130°C, and the carbon composite material in which the nano-alloy accounts for 70% by weight of the composite material is prepared, wherein the average grain size of the SnSb alloy observed by a scanning electron microscope is 200nm, and the free SnSb Alloy accounts for less than 10% of the total alloy. The obtained product has an oxygen content of less than 1% through elemental analysis.

[0044] The composite carbon powder in this example, carbon black and N-methylpyrrolidone solution of polyvinylidene fluoride are mixed at normal temperature and pressure to form a slurry, which is evenly coated on the copper foil substrate, and the thickness of the obtained film is about 100 μm. After drying the composite carbon powder, the weight percentage of carbon black and polyvinylidene fluoride is 90:5:5, and the rest of the working electrode preparation steps are the same as in Exampl...

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The present invention relates to the technology of room temperature secondary lithium cell. The secondary lithium cell consists of positive pole, negative pole, organic electrolyte solution or polymer electrolyte, and its negative pole is made of carbon with deposited nanometer alloy on its surface. It the composite material, carbon material is used as skeleton and the nanometer alloy is dispersed onto the surface of the carbon material. The secondary lithium cell of the present invention has high capacity, good circulation performance, large current charge and discharge resistance, and is safe, reliable and friendly to environment. It may be used in mobile telephone, notebook computer and other fields.

Description

technical field [0001] The invention belongs to the technical field of high-energy batteries, in particular to the technical field of room-temperature secondary lithium batteries. Background technique [0002] Among the negative electrode active materials of the secondary lithium battery, the theoretical specific capacity of metal lithium is 3830mAh / g, so the energy density of the secondary lithium battery using metal lithium as the negative electrode active material is the highest. However, dendrite growth occurs in the lithium metal negative electrode during charging and discharging, which causes the internal short circuit of the battery, causing the battery to burn or even explode. In order to improve its safety, from the early 1970s to the end of the 1980s, lithium alloys such as lithium aluminum, lithium silicon, lithium lead, lithium tin, lithium cadmium, etc. had replaced metal lithium as the negative electrode active material, although this was avoided to a certain e...

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 Patents(China)
IPC IPC(8): B22F1/054B22F1/148H01M4/02H01M4/04H01M4/36H01M4/38H01M4/58H01M4/587H01M4/62H01M10/052H01M10/36
CPCH01M2004/027H01M4/38Y02E60/122H01M4/625B22F1/0096H01M10/052H01M4/587H01M4/366B22F1/0018B82Y30/00H01M4/04H01M4/362Y02E60/10B22F1/054B22F1/148B22F1/056
Inventor 李泓师丽红黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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