Unlock instant, AI-driven research and patent intelligence for your innovation.

Negative electrode powder for lithium ion secondary battery and method for producing the same

A secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, chemical instruments and methods, etc., can solve the problem of low initial efficiency and achieve the effect of improving initial efficiency

Active Publication Date: 2019-10-29
OSAKA TITANIUM TECHNOLOGIES
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is known that the initial efficiency (the ratio of the initial discharge capacity to the initial charge capacity) of the working electrode 2c using silicon oxide is as low as about 70%

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
  • Negative electrode powder for lithium ion secondary battery and method for producing the same
  • Negative electrode powder for lithium ion secondary battery and method for producing the same
  • Negative electrode powder for lithium ion secondary battery and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0074] In order to confirm the effects of the present invention, Li-containing silicon oxide powder was produced, a lithium ion secondary battery (full battery) using the silicon oxide as a negative electrode was produced, and the characteristics of the battery were evaluated. Table 1 shows the production conditions of the silicon oxide powder.

[0075] [Table 1]

[0076]

[0077] As the lithium compound powder, powder of lithium hydride was used. The prebaking process and the main calcination process were performed in Ar atmosphere using a rotary kiln. For the mixing process, the preliminary roasting process and the main roasting process, only implement 1 time in embodiment 1, implement 3 times in embodiment 2 and 3, implement 2 times in embodiment 4. In each of Comparative Examples 1 and 2, only one main calcination process was implemented, and the preliminary calcination process was not implemented. The holding temperature at the prebaking temperature was all set to 6...

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

A lithium -ion secondary battery is used for silicon oxide powder containing li.Based on the average composition of the powder as a whole, when the Moore ratio of Li and Si and O is set to Y: 1: X, the relationship between 0.5 <x <1.5, and 0.1 <y / x <0.8.The medium size of the powder in the negative electrode is within the range of 0.5 to 30 μm.Use CUK for the powder α When the ray X -ray diffraction is determined, it will be derived from li 2 SIO 3 The peak height is set to P1, set the peak height from the crystalline SI to P2, the derived from li 4 SIO 4 When the peak height is set to P3, it meets the relationship between P2 / P1≤1.0 and the relationship between P3 / P1 ≤ 1.0.When the powder is used for the negative electrode of the secondary battery of a lithium ion, it can improve the initial efficiency and the capacity maintenance rate under long -term circulation.

Description

technical field [0001] This invention relates to the powder for negative electrodes of a lithium ion secondary battery, and its manufacturing method, More specifically, It is related with the powder for negative electrodes containing silicon oxide containing lithium, and its manufacturing method. Background technique [0002] In recent years, along with the remarkable development of mobile electronic devices and communication devices, there has been a strong demand for the development of secondary batteries with high energy density from the viewpoint of economy, size reduction and weight reduction of devices. At present, secondary batteries with high energy density include nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion secondary batteries, polymer batteries, and the like. Among them, lithium-ion secondary batteries have an exceptionally longer life and higher capacity than nickel-cadmium batteries and nickel-hydrogen batteries, and demand for them is increa...

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): H01M4/485H01M4/36
CPCH01M4/36H01M4/485C01B33/20C01P2002/74C01P2004/51C01P2004/64C01P2006/12Y02P70/50Y02E60/10C01B33/32H01M4/362H01M4/366H01M4/62H01M4/625H01M10/0525C01P2006/40C01P2002/72H01M4/386H01M10/045
Inventor 木崎信吾柏谷悠介竹下浩树
Owner OSAKA TITANIUM TECHNOLOGIES