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

Amorphous alloy negative electrode compositions for lithium-ion electrochemical cells

An electrochemical and lithium-ion technology, applied in battery electrodes, lithium batteries, electrochemical generators, etc., can solve problems such as poor cycle life and poor Coulombic efficiency, and achieve the effect of reducing internal stress

Inactive Publication Date: 2014-06-04
3M INNOVATIVE PROPERTIES CO
View PDF15 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a problem with such alloys is that they often exhibit relatively poor cycle life and poor Coulombic efficiency due to fragmentation of alloy particles during expansion and contraction associated with compositional changes in the alloy

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
  • Amorphous alloy negative electrode compositions for lithium-ion electrochemical cells
  • Amorphous alloy negative electrode compositions for lithium-ion electrochemical cells
  • Amorphous alloy negative electrode compositions for lithium-ion electrochemical cells

Examples

Experimental program
Comparison scheme
Effect test

example 1-3

[0048] Example 1-3 Amorphous Si 66-x sn 4 Fe x C 30 .

[0049] raw material

[0050] Silicon (Si) - Coarse powder, 99.8% purity, available from Elkem (Majorstua, Norway).

[0051] Tin (Sn) - 325 mesh, 99.8% purity, available from Alfa Asear (Ward Hill, MA).

[0052] FeSi50 - Ferrosilicon, 50% by weight silicon, <1.5 mm, available from Globe Metallurgical (Beverly, OH).

[0053] TiSi 2 - 325 mesh, 99.5% purity, available from Alfa Aesar.

[0054] C (graphite) - TIMREX SFG-44, available from TimCal Ltd (Bodio, Switzerland).

[0055] The appropriate amount of raw material (see Table 1) and 10 kg of 0.5 inch (1.25 cm) diameter chromium steel balls were added to a 5 L steel container (7.4 inch (18.3 cm) inner diameter). Use the container with N 2 Purge and grind at 98 rpm (revolutions per minute) for 10 days.

[0056] Table 1

[0057] Alloy composition (Si 66-x sn 4 Fe x C 30 )

[0058] example

[0059] figure 1 X-ray dif...

example 4-7

[0060] Examples 4-7. Amorphous Si 66-2y sn 4 Fe y Ti y C 30

[0061] The appropriate amount of raw material (see Table 1) and 10 kg of 0.5 inch (1.25 cm) diameter chromium steel balls were added to a 5 L steel container (7.4 inch (18.3 cm) inner diameter). Use the container with N 2 Sweep and grind at 98 rpm (revolutions per minute) for 13 days.

[0062] Table 2

[0063] Alloy composition (Si 66-2y sn 4 Fe y Ti y C 30 )

[0064] example

alloy composition

Si

sn

FeSi50

TiSi2

C

stearic acid

4

Si 62 sn 4 Fe 2 Ti 2 C 30

54.74g

17.04g

7.81g

7.47g

12.94g

1.00g

5

Si 60 sn 4 Fe 3 Ti 3 C 30

48.00g

16.75g

11.51g

11.02g

12.72g

1.00g

6

Si 58 sn 4 Fe 4 Ti 4 C 30

41.49g

16.47g

15.09g

14.44g

12.50g

1.00g

7

Si 61 sn 4 Fe 5 Ti 5 C 25

15.77g

15....

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

Negative electrode compositions for use in a lithium-ion electrochemical cell are provided that has the formula, SixSnqMyCz, wherein q, x, y, and z represent mole fractions, q, x, and z are greater than zero and M is one or more transition metals. The provided electrode compositions are amorphous and can be made by sputtering or ball milling. Typically, 0.50 <= x <= 0.83, 0.02 <= y <= 0.10, 0.25 <= z <= 0.35, and 0.02 <= q <= 0.05. Electrodes made using the provided electrode compositions can include a binder than can be lithium polyacrylate.

Description

technical field [0001] The present disclosure relates to alloy anodes for use in lithium ion electrochemical cells. Background technique [0002] Lithium-ion electrochemical cells typically have a negative electrode, a positive electrode, and an electrolyte. Graphite-based anodes have been used in lithium-ion electrochemical cells. Silicon has nearly three times the theoretical volume-specific capacity for lithium metal compared to graphite; silicon is therefore an attractive anode material for use in lithium-ion electrochemical cells. However, the volume expansion of silicon upon its full lithiation is often too large to be tolerated by conventional binders used to fabricate composite electrodes, leading to anode failure during electrochemical cell cycling. [0003] Metal alloys including silicon are useful as negative electrodes for lithium-ion electrochemical cells. These alloy-type anodes generally exhibit higher capacities relative to intercalation-type anodes such a...

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): H01M4/38H01M4/134H01M4/1395H01M10/0525
CPCH01M4/386H01M4/387H01M4/622H01M10/052H01M4/134Y02E60/122Y02E60/10
Inventor 黎丁巴杰弗里·R·达恩
Owner 3M INNOVATIVE PROPERTIES CO