Novel materials including elements of group 14

A technology of family elements and element cycles, applied in the direction of electrical components, active material electrodes, structural parts, etc., can solve problems such as mechanical and electrical contact damage, achieve good unit mass capacity, and overcome mechanical fatigue

Inactive Publication Date: 2010-03-24
CENT NAT DE LA RECHERCHE SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This change in volume can lead to damage to the mechanical and electrical contact between the active elements of the material making up the anode—that is, the particles of a conductive diluent such as carbon—and the binder.

Method used

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  • Novel materials including elements of group 14
  • Novel materials including elements of group 14
  • Novel materials including elements of group 14

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0037] According to a first embodiment, the method for preparing a material comprising at least one group 14 element comprises at least one step of thermally decomposing a material represented by the following chemical formula (II) under vacuum conditions:

[0038] wxya

[0039] in:

[0040] - A denotes an alkali metal, especially an alkali metal selected among lithium, sodium and potassium,

[0041] -x represents an integer from 1 to 20, especially an integer from 2 to 15, especially 3 to 12, or even 4 to 10,

[0042] -G means silicon,

[0043] -y represents an integer from 1 to 10, especially an integer from 1 to 6, or even 1 to 4,

[0044] - M denotes a noble or semi-precious metal, especially a noble or semi-precious metal selected among aluminum, cobalt, nickel, copper, zinc, silver, and

[0045] -z represents an integer from 1 to 5, especially an integer from 1 to 3, even 1 to 2.

[0046] This method may be called "thermal decomposition method" or "solid state metho...

no. 2 approach

[0064] According to a second embodiment, the method for preparing a material comprising at least one group 14 element comprises at least the following steps:

[0065] - contacting an oxidizing solvent with a material represented by the following chemical formula (III):

[0066] wxya

[0067] in:

[0068] - A represents at least one alkali metal or alkaline earth metal, especially at least one alkali metal or alkaline earth metal selected among lithium, sodium, potassium, rubidium, magnesium and calcium,

[0069] -x represents an integer from 1 to 12, especially from 1 to 10, especially from 1 to 8,

[0070] - G represents at least one group 14 element, especially at least one group 14 element selected among silicon, germanium, tin and lead, and

[0071] - y represents an integer from 1 to 17, especially from 1 to 15, especially from 1 to 13, and even from 1 to 10, and

[0072] -z is 0,

[0073] - Recovery of A-poor or A-free material.

[0074] As previously stated, when ...

example 1

[0156] Example 1: Alloy Li 13 Ag 5 Si6 preparation of

[0157] A mixture of 0.117 grams of lithium (ingot form, 99.54% purity, from Cogema), 0.913 grams of silver (needle form, 99.999% purity, from Strem Chemicals) and 0.237 grams of silicon (powder form, 99.998% purity from Goodfellow) was placed in In a tantalum reactor sealed by arc welding, the tantalum reactor is placed in a quartz tube which is then sealed under vacuum. The reactor was then placed in a furnace, the temperature was raised from ambient temperature to 950°C at a rate of 100°C / h, then maintained at 950°C for 4 hours, cooled to 700°C at a rate of 10°C / h, and at 700°C Heat for 10 hours, then cool to ambient temperature at a rate of 10°C / h. figure 1 Thermal curves are shown graphically.

[0158] A stoichiometric Li 13 Ag 5 Si 6 compound of.

[0159] The compound was studied by X-ray powder diffraction and single crystal diffraction. figure 2 The diffraction pattern of the powder is shown. All peaks ...

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Abstract

The invention relates to a method for preparing a material including at least one member of the Group 14 by thermal degradation of a ternary phase, also known as the Zintl phase, or by reaction therewith with an oxidising solvent. The invention also relates to the material containing at least one element of Group 14 that can be obtained by this method, and to the use thereof mainly in the field ofelectrochemistry, particularly for batteries. The material is more particularly suited for the field of batteries of the alkaline metal and / or alkaline-earth ions type, in particular of the lithium-ion type.

Description

technical field [0001] The present invention relates to a process for the preparation of materials comprising at least one group 14 element by thermal decomposition of a ternary phase (also called Zintl phase) or by reaction of said ternary phase with an oxygenated solvent. [0002] The invention also relates to a material comprising at least one element of group 14 obtainable by this method and to its use mainly in the field of electrochemistry, especially in the field of batteries. Said materials are more particularly suitable for the field of batteries of the alkali metal type and / or alkaline earth ion type, especially lithium ion type. [0003] The invention also relates to an anode based on the material thus defined. [0004] The method of the invention allows obtaining a material with an optimized capacity per unit mass, capable of storing and releasing alkali metals and / or alkaline earth metals in a reversible manner. This makes such materials particularly suitable fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/38H01M4/40H01M4/42H01M4/46H01M10/0525H01M4/134H01M4/02H01M10/052H01M10/054H01M10/36
CPCY02E60/12H01M4/381H01M2004/027H01M10/054H01M10/052H01M4/405H01M4/38H01M4/40Y02E60/10
Inventor 大卫·齐图克洛德·贝林莫妮克·蒂亚尔劳伦斯·拉克鲁瓦-奥里奥玛蒂尔德·佩洛西
Owner CENT NAT DE LA RECHERCHE SCI
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