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

Detecting method of specific capacity of negative electrode material of lithium ion battery after circulation

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problem that the specific capacity of negative electrode materials is difficult to accurately detect, and achieve the effect of low environmental requirements and guaranteed accuracy

Active Publication Date: 2012-07-25
DONGGUAN AMPEREX TECH
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for detecting the specific capacity of negative electrode materials of lithium ion batteries after cycling, so as to solve the problem that the specific capacity of negative electrode materials of lithium ion batteries after cycling is difficult to accurately detect

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
  • Detecting method of specific capacity of negative electrode material of lithium ion battery after circulation
  • Detecting method of specific capacity of negative electrode material of lithium ion battery after circulation
  • Detecting method of specific capacity of negative electrode material of lithium ion battery after circulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: hydrochloric acid cleaning recovery diaphragm

[0031]Use 1# graphite as the negative electrode material, discharge the 18650 lithium-ion battery at 0.1C to 1.5V after 1 cycle, disassemble the battery and take out the negative electrode; soak the electrode in DMC solvent for 30 minutes, shake to remove the negative electrode Lithium salt; after taking it out, dry the pole piece at 85°C; soak the pole piece with 5% hydrochloric acid by mass for about 30 minutes, and ultrasonically vibrate to make the diaphragm of the active material fall off from the current collector; Separation of solids and liquids from the acidic solution of the tablets, and washing the obtained solids with deionized water until the filtrate was neutral pH=7.0; after the separated solids were vacuum-dried at 85°C and ground, the obtained powders were subjected to 200-mesh Sieve to obtain graphite powder; mix graphite powder with conductive carbon, binder SBR and thickener CMC in a ratio...

Embodiment 2

[0032] Embodiment 2 Sulfuric acid cleans and recovers the diaphragm

[0033] Use 1# graphite as the negative electrode material, discharge the 18650 lithium-ion battery at 0.1C to 1.5V after 1 cycle, disassemble the battery and take out the negative electrode; soak the electrode in DMC solvent for 30 minutes, shake to remove the negative electrode Lithium salt; after taking it out, dry the pole piece at 85°C; soak the pole piece with 8% mass ratio of sulfuric acid for about 30 minutes, and ultrasonically vibrate to make the diaphragm of the active material fall off from the current collector; Separation of solids and liquids from the acidic solution of the tablets, and washing the obtained solids with deionized water until the filtrate was neutral pH=7.0; vacuum-dried the separated solids at 95°C and ground them, then subjected the obtained powders to 200-mesh Sieve to obtain graphite powder; mix graphite powder with conductive carbon, binder SBR and thickener CMC in a ratio o...

Embodiment 3

[0035] Discharge the 18650 lithium-ion battery with 1# graphite as the negative electrode material at 0.1C to 1.5V after 600 cycles, disassemble the battery and take out the negative electrode sheet; soak the electrode sheet in DMC solvent for 30 minutes, shake to remove the Lithium salt; after taking it out, dry the pole piece at 85°C; soak the pole piece with 5% hydrochloric acid solution by mass for about 30 minutes, and ultrasonically vibrate to make the diaphragm of the active material fall off from the current collector; The acidic solution of the diaphragm is subjected to solid-liquid separation, and the obtained solid is washed with deionized water until the filtrate is neutral pH=7.0; after the separated solid is vacuum-dried at 100°C and ground, the obtained powder is subjected to 200 Mesh sieving to obtain graphite powder; graphite powder and conductive carbon, binder SBR and thickener CMC are mixed in a ratio of 95:1:3:1, stirred and coated on copper foil, dried to ...

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 discloses a detecting method of specific capacity of negative electrode material of a lithium ion battery after circulation. The detecting method comprises the following steps: 1) discharging the lithium ion battery after circulation, then dismantling the battery and taking out a negative electrode plate; 2) washing the negative electrode plate a plurality of times immediately using organic solvent and drying, then putting the negative electrode plate in acidic solution and dipping sufficiently, enabling a negative electrode membrane on the negative electrode plate to fall in the acidic solution; 3) taking out a current collector of the negative electrode plate, then carrying out solid-liquid separation upon the acidic solution in which the negative electrode membrane is dissolved, obtaining solid substance, washing the solid substance repeatedly using de-ionized water till the pH value of filtrate is 6-7, drying in vacuum condition, then grinding and sieving, obtaining graphite powders; and 4) making the lithium ion battery by using the graphite powders as negative electrode material, stewing for two hours and then measuring the specific capacity of the lithium ion battery. In comparison with the prior art, the detecting method has the advantages of low requirement on the environment and high accuracy.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, in particular to a relatively accurate detection method for the specific capacity of negative electrode materials of lithium-ion batteries after cycles. Background technique [0002] With the development of modern society, various mobile devices, such as video cameras, notebook computers, portable DVDs and digital cameras, have been used more and more widely, so they have the advantages of light weight, large energy storage, high power, no pollution, and long life. Lithium-ion batteries, which have many advantages, are also favored by people and become the best power source for mobile devices. With the shortage of energy in the world, countries are vigorously developing new energy sources. High-power and pollution-free lithium-ion batteries are used as new energy sources. It has become energy storage batteries and automotive power batteries, which have made the production capacity o...

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): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 郭佳丽吴梦尧许金梅向登陈益荣
Owner DONGGUAN AMPEREX TECH
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