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

Si alloy powder for negative electrode active material of lithium ion secondary battery and manufacturing method thereof

An alloy powder, secondary battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as crystallinity reduction, and achieve the effect of excellent cycle life and high discharge capacity

Active Publication Date: 2017-12-05
SANYO SPECIAL STEEL COMPANY
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, the Si alloy powder used in the negative electrode of the lithium-ion secondary battery is often pulverized by a ball mill to a size of several μm or less, and the crystallinity is lowered before use.

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
  • Si alloy powder for negative electrode active material of lithium ion secondary battery and manufacturing method thereof
  • Si alloy powder for negative electrode active material of lithium ion secondary battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0055] First, in order to study the effect of C addition on discharge capacity and cycle life, for Si-19%Cr-x%C and Si-9%Cr-6%Ti-2%Al-2%Sn-x%C An evaluation was carried out (Experiment A). Then, change the types and amounts of various added elements, and evaluate the upper and lower limits of each added amount and factor (experiment B). Finally, a composite powder in which natural graphite powder or pure Zn powder was also introduced during the treatment by vibration grinding was evaluated (Experiment C).

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

Provided is Si-alloy powder for a lithium-ion secondary battery negative electrode active material having a higher discharging capacity and excellent in cycle life and also provided is a method for manufacturing the Si-alloy powder. The Si-alloy powder for the lithium-ion secondary battery negative electrode according to the present invention is formed by containing C of 0.01 to 0.5 at%, either one element or two or more elements of Cr, Ti, Al, and Sn having a total amount of 10 to 25 at%, the remaining Si, and unavoidable impurities and satisfies the following two equations (1), (2): 0.15 ≤ Cr at% / (Cr at% + Ti at% + Al at% + Sn at%) ≤ 1.00 … (1) (Al at% + Sn at%) / (Cr at% + Ti at% + Al at% + Sn at%) ≤ 0.40 … (2)

Description

[0001] Related references for related applications [0002] This application claims priority based on Japanese Patent Application No. 2013-81121 for which it applied on April 9, 2013, and the disclosure content of the whole text is taken in this specification by reference. technical field [0003] The present invention relates to a Si alloy powder for a negative electrode of a lithium ion secondary battery excellent in discharge capacity and cycle life and a manufacturing method thereof. Background technique [0004] Conventionally, powders made of carbon materials have been used as negative electrode active materials for lithium secondary batteries, but the theoretical capacity of carbon materials is as low as 372 mAh / g, and there is a limit to higher capacity. In contrast, in recent years, metal materials with higher theoretical capacities than carbon materials such as Sn, Al, and Si have been studied and put into practical use. In particular, Si has a theoretical capacit...

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): H01M4/38C01B33/06C01B35/04
CPCC01B33/06C22C28/00H01M4/134H01M4/386Y02E60/10
Inventor 泽田俊之
Owner SANYO SPECIAL STEEL COMPANY