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Lithium ion secondary battery negative active material and preparation method thereof, lithium ion secondary battery negative pole piece and lithium ion secondary battery

A negative electrode active material, secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problem that the alloy product is not uniform, limit the volume energy density of lithium ion secondary batteries, and affect the performance of lithium ion secondary batteries, etc. problem, to achieve the effect of excellent cycle performance and excellent first-time efficiency

Active Publication Date: 2014-05-14
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of preparation methods, physical sputtering, electrodeposition or high-energy ball milling methods are mostly used for germanium-containing binary alloys, but physical sputtering and electrodeposition methods are limited to the production of alloy films with a thickness of several μm, which severely limits the lithium ion The volume energy density of the secondary battery, the alloy product prepared by the high-energy ball milling method may not be uniform enough, which will affect the performance of the lithium-ion secondary battery

Method used

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  • Lithium ion secondary battery negative active material and preparation method thereof, lithium ion secondary battery negative pole piece and lithium ion secondary battery

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preparation example Construction

[0035] In a second aspect, an embodiment of the present invention provides a method for preparing a negative electrode active material for a lithium-ion secondary battery, comprising the following steps:

[0036] (1) Take the metals Si, Ge, Al and M, according to the chemical expression: Si a Ge b al c m d Proportioning and mixing to form a mixture, a, b, c and d represent mole fractions respectively, a is 20%~70%, b is 0.01%~10%, c is 1%~50%, d is 25%~75%, M is selected from one or more of Sn, Co, Ni, Ti, Fe, Cu, Mn, Mo, V and Cr;

[0037] (2) The mixture is placed in an arc induction furnace, melted at a temperature of 800~1000°C under vacuum or argon protection, and then cast into an ingot, and then the ingot is placed in a melt quenching furnace Inside, under the condition of vacuum or argon protection, it is smelted twice at a temperature of 800~1000°C, prepared into flakes or blocks by melt rapid quenching method, and then ball milled to obtain powdered negative elec...

Embodiment 1

[0056] A preparation method for a negative electrode active material of a lithium ion secondary battery, comprising the following steps:

[0057] (1) Take the metals Si, Ge, Al and Co, according to the chemical expression: Si 60 Ge 3 al 7 co 30 Proportioning and mixing to form a mixture;

[0058] (2) The mixture is placed in an arc induction furnace, melted at a temperature of 950°C under vacuum conditions, and then cast into an ingot, and then the ingot is placed in a melt quenching furnace, under vacuum conditions Secondary smelting at a temperature of 950° C., prepared into flakes by a melt quenching method, and then ball milled in anhydrous ethanol to obtain a powdery lithium-ion secondary battery negative electrode active material with a particle size of 25 μm.

[0059] Preparation of Negative Electrode for Lithium-ion Secondary Battery

[0060] The above-mentioned lithium ion secondary battery negative electrode active material, carbon fiber, lithium polyacrylate an...

Embodiment 2

[0067] A preparation method for a negative electrode active material of a lithium ion secondary battery, comprising the following steps:

[0068] (1) Take the metals Si, Ge, Al and Fe, according to the chemical expression: Si 40 Ge 5 al 25 Fe 30 Proportioning and mixing to form a mixture;

[0069](2) The mixture is placed in an arc induction furnace, melted at a temperature of 900°C under vacuum conditions, and then cast into an ingot, and then the ingot is placed in a melt quenching furnace, under vacuum conditions Secondary smelting at a temperature of 900° C., prepared into flakes by a melt quenching method, and then ball milled in anhydrous ethanol to obtain a powdery lithium-ion secondary battery negative electrode active material with a particle size of 10 μm.

[0070] Preparation of Negative Electrode for Lithium-ion Secondary Battery

[0071] The above-mentioned lithium ion secondary battery negative electrode active material, carbon fiber, lithium polyacrylate an...

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Abstract

The embodiment of the invention provides a lithium ion secondary battery negative active material, which has a chemical formula of SiaGebAlcMd. Specifically, a, b, c and d respectively represent mole fractions, a is 20%-70%, b is 0.01%-10%, c is 1%-50%, d is 25%-75%, and M is one or more of Sn, Co, Ni, Ti, Fe, Cu, Mn, Mo, V and Cr. The lithium ion secondary battery negative active material has excellent cycling performance and initial efficiency. The embodiment of the invention also provides a preparation method of the lithium ion secondary battery negative active material, a lithium ion secondary battery negative pole piece containing the lithium ion secondary battery negative active material, and a lithium ion secondary battery containing the lithium ion secondary battery negative active material. The lithium ion secondary battery has high energy density and good cycle performance.

Description

technical field [0001] The invention relates to the field of lithium ion secondary batteries, in particular to a lithium ion secondary battery negative electrode active material and a preparation method thereof, a lithium ion secondary battery negative pole piece and a lithium ion secondary battery. Background technique [0002] With the rapid development of portable electronic devices and electric vehicles, the demand for lithium-ion secondary batteries with high specific energy and excellent cycle performance has become more urgent. [0003] At present, the anode materials of commercialized lithium-ion secondary batteries are mainly graphite and carbon materials. Research and practice have shown that the electrochemical capacity of carbon materials is low, and its theoretical capacity is only 372mAh / g. The volume specific capacity is quite limited, which cannot meet the actual need. In recent years, more research has focused on finding metal and alloy materials as new hig...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/46H01M4/134H01M10/0525
CPCH01M4/134H01M4/38H01M10/0525H01M4/386H01M4/387H01M4/46Y02E60/10
Inventor 廖华栋
Owner HUAWEI TECH CO LTD
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