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

SiO powder for secondary battery and process for producing the same

A secondary battery and manufacturing method technology, applied in the direction of secondary battery, electrode manufacturing, battery electrodes, etc., can solve the problems of unable to alleviate the volume expansion of lithium ions, unable to ensure the maintenance of discharge capacity, etc., to achieve miniaturization or low Reduce costs, achieve leapfrog performance, and reduce electricity bills

Inactive Publication Date: 2007-06-27
OSAKA TITANIUM TECHNOLOGIES
View PDF3 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, in the negative electrode active materials disclosed in JP-A-2001-118568 and JP-A-2002-260651, when silicon oxide is used as the anode material, although it is desired to set SiO x The value of X in the composition, the specific surface area, or the shape of the powder, etc., to improve the irreversible capacity during the initial charge and discharge or the maintenance of the discharge capacity (cycle), but it cannot alleviate the problem of lithium ion adsorption and desorption. The volume expands, so there is a problem that it cannot ensure sufficient discharge capacity maintenance (cycle performance) as a negative electrode material for lithium secondary batteries

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
  • SiO powder for secondary battery and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0050] Hereinafter, the effect exhibited when the hydrogen-containing SiO powder of the present invention is used as a negative electrode material of a lithium secondary battery will be described based on specific inventive examples and comparative examples.

[0051] The coin-shaped lithium secondary battery shown in FIG. 1 was used for the evaluation tests of the inventive example and the comparative example. As the negative electrode material of the inventive example, four kinds of SiO powders with the hydrogen concentration of about 80 ppm, 100 ppm, 200 ppm and 300 ppm were used, and as the negative electrode material of the comparative example, SiO powders with the hydrogen concentration of about 30 ppm, 40 ppm and 50 ppm were used. 3 types of SiO powder.

[0052] In order to evaluate the characteristics of the lithium secondary battery, the aforementioned coin-shaped lithium secondary battery was manufactured, and the discharge capacity and cycle capacity retention rate w...

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
thicknessaaaaaaaaaa
Login to View More

Abstract

An SiO powder for secondary battery that is used as a negative electrode material of lithium secondary battery and characterized in that the concentration of contained hydrogen is = 80 ppm. The powder would enable striking enhancement of discharge capacity and rate of cycle capacity maintenance and thus would enable realization of a size reduction of lithium secondary battery and cost reduction thereof. There is provided a process for producing such an SiO powder, comprising mixing silicon dioxide powder with a silicon powder of = 30 ppm contained hydrogen concentration, heating the mixture at 1250 DEG to 1350 DEG C so as to achieve gasification of SiO, depositing the SiO on a deposition base, and thereafter carrying out pulverization thereof. Thus, the SiO powder can be produced with high efficiency and can realize substantial reduction of production costs, such as power cost, so that it can find a wide spectrum of application as an SiO powder for secondary battery.

Description

technical field [0001] The present invention relates to SiO powder most suitable for use as a negative electrode material of a lithium secondary battery capable of occluding and releasing lithium by using a lithium ion conductive nonaqueous electrolyte, and a method for producing the same. Background technique [0002] In recent years, along with the remarkable development of portable electronic devices, communication devices, etc., development of secondary batteries with high energy density has been strongly demanded from the viewpoint of economy, size reduction and weight reduction of devices. As such high-energy-density secondary batteries, there are nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion secondary batteries, and polymer batteries. However, lithium-ion secondary batteries (hereinafter referred to as "lithium secondary batteries") are due to NiCd batteries or NiMH batteries have a longer life and higher capacity than NiCd batteries, so their deman...

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): H01M4/02H01M4/48H01M10/40H01M4/131H01M4/1395H01M4/485H01M4/505H01M4/525H01M10/052
CPCH01M4/0471Y02E60/122H01M2004/028H01M4/405H01M4/505H01M4/131H01M10/052H01M4/1395H01M4/525H01M4/463H01M4/485Y02E60/10H01M4/48H01M4/13
Inventor 木崎信吾西冈和雄
Owner OSAKA TITANIUM TECHNOLOGIES
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