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

Lithium secondary cell

A lithium secondary battery and non-aqueous electrolyte technology, which can be applied to secondary batteries, dry batteries, battery electrodes, etc., and can solve problems such as the shedding of the mixture layer

Inactive Publication Date: 2004-03-10
PANASONIC CORP
View PDF10 Cites 60 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a disadvantage that when the electrode is rolled to achieve a high density, the mixture layer is prone to fall off.

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
  • Lithium secondary cell
  • Lithium secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] The present invention relates to a lithium secondary battery using a negative electrode formed by immobilizing an active material composed of a mixture of artificial graphite particles A and highly circular spherical graphite particles B on a copper core. The above-mentioned artificial graphite particle A is obtained by mixing and granulating the matrix material obtained by pulverizing the overall mesophase pitch and the pitch and / or thermosetting resin in a softened state, and carbonizing the granules at 700-1500°C, and then carbonizing them at 2500-2500°C. Particles obtained by graphitization at 3000°C.

[0061] In the method for producing artificial graphite particles A, the average particle diameter of the base material produced after pulverizing the bulk mesophase pitch is 7-20 μm, and the amount of pitch and / or thermosetting resin is 8-25 wt. share.

[0062] Adopt the present invention, because the graphite structure of the artificial graphite particle A as the m...

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 diameteraaaaaaaaaa
face spacingaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The present invention provides a lithium rechargeable battery including a negative electrode comprising a copper core material, to which is fixed an active material made by mixing artificial graphite particles A obtained by kneading and granulating a base material of pulverized bulk mesophase pitch with pitch in a softened state and / or thermosetting resin, carbonizing the resulting granules at 700 to 1,500 DEG C. and graphitizing the carbonized granules at 2,500 to 3,000 DEG C. with spherical graphite particles B having a high mean circularity, with a view to inhibiting the deterioration in battery capacity through the repeated charge / discharge cycles, which occurs remarkably in a high energy density lithium rechargeable battery, and providing excellent discharge characteristic and safety.

Description

technical field [0001] The present invention relates to lithium secondary batteries. Background technique [0002] As electronic devices become more portable and cordless, it is desired to use small, light weight lithium secondary batteries with high energy density as their driving power sources. For example, the so-called rocking chair type lithium-ion secondary battery has been put into practical use and is rapidly spreading. This lithium-ion secondary battery consists of a negative electrode that can reversibly absorb and release lithium ions as an active material, and a lithium-containing The transition metal composite oxide is used as the positive electrode of the active material, the separator and the non-aqueous electrolyte. [0003] Here, as for the negative electrode, graphite particles with high crystallinity have recently become the mainstream among various carbon materials. The reason is that graphite particles (1) have high electron conductivity and excellent d...

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): H01M4/60H01M4/02H01M4/133H01M4/36H01M4/58H01M4/587H01M4/62H01M4/66H01M6/10H01M10/0525H01M10/36H01M50/119H01M50/124
CPCH01M2/0285H01M4/621Y02E60/122H01M2/0287H01M2/0217H01M4/661H01M4/133H01M4/587H01M2004/021H01M4/364H01M6/10H01M10/0525Y02E60/10H01M50/103H01M50/124H01M50/119H01M4/60
Inventor 加藤文生尾浦孝文福本友祐山本典博藤原昌三
Owner PANASONIC CORP
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