Lithium ion battery lithium-rich electrode piece and preparation method thereof

一种锂离子电池、富锂的技术，应用在电极制造、电池电极、锂蓄电池等方向，能够解决生产效率低下、生产成本高等问题，达到生产成本下降、改善安全性能、尺寸精度控制优势的效果

Active Publication Date: 2016-03-30
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating environment of this method needs to be carried out in a high vacuum environment, and the production efficiency is low, and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] According to the first aspect of the present invention, the preparation method of the lithium-rich pole piece of the lithium ion battery comprises the steps of: (1) under the protective gas environment, melting the lithium ingot to obtain molten lithium; (2) under the vacuum environment, melting the ceramic particles heating and drying to remove water to obtain dry and dewatered ceramic particles; (3) under a protective gas environment, adding the dried and dewatered ceramic particles to molten lithium, stirring to mix them evenly, and obtaining modified molten lithium; ( 4) Under a protective gas environment, the modified molten lithium is evenly coated on the surface of the lithium-enriched pole piece to form a lithium-rich layer, and the lithium-rich pole piece of the lithium-ion battery is obtained after cooling to room temperature.

[0020] In the process of lithium enrichment, due to the high surface tension of molten lithium (about 397dyn / cm), if it is directly co...

Embodiment 1

[0039] A preparation of lithium-ion battery to be rich in lithium negative electrode sheet

[0040] Negative electrode active material SiO / C (wherein, the mass percent of SiO is 10%), conductive agent conductive carbon black, binder SBR / CMC are dissolved in solvent deionized water according to mass ratio 94:2:4, stir evenly The negative electrode slurry is made, and then the negative electrode slurry is evenly coated on the front and back surfaces of the negative electrode current collector Cu foil, dried, and then subjected to cold pressing to obtain a lithium-ion battery to be lithium-enriched negative electrode sheet.

[0041] B prepares the lithium-rich negative pole sheet of lithium-ion battery

[0042] (1) Under the protection environment of argon gas, the lithium ingot with a purity of 99.9% is heated and melted at 250°C to form molten lithium; (2) under the vacuum environment of 160°C and vacuum degree ≤ -97KPa, the particle size D50 is The 0.5 μm MgO ceramic particle...

Embodiment 2

[0048] A preparation of lithium-ion battery to be rich in lithium negative electrode sheet

[0049] Except that the mass percent content of SiO in the negative electrode active material SiO / C is 30%, the rest is the same as that of Example 1.

[0050] B prepares the lithium-rich negative pole sheet of lithium-ion battery

[0051] (1) Under the protection environment of argon gas, the lithium ingot with a purity of 99.9% is heated and melted at 250°C to form molten lithium; (2) under the vacuum environment of 160°C and vacuum degree ≤ -97KPa, the particle size D50 is 0.5 μm TiO 2 The ceramic particles are heated and dried to remove water for 24 hours to obtain TiO after drying and water removal. 2 ceramic particles, and make sure the TiO is dry after dehydration 2 The water content of the ceramic particles is less than or equal to 5ppm; (3) under the protection of argon, the TiO after drying and dehydration 2 The ceramic particles are added to the molten lithium, and mixed ...

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Abstract

The present invention provides a lithium ion battery lithium-rich electrode piece and a preparation method thereof. The preparation method of the lithium ion battery lithium-rich electrode piece comprising the following steps: (a) under protective gas environment, molting a lithium ingot to obtain molten lithium; (2) in vacuum environment, heating and drying ceramic particles for removing water to obtain dried dewatered ceramic particles; (3) under protective gas environment, adding the dried dewatered ceramic particles into the molten lithium, stirring and mixing uniformly to obtain modified molten lithium; and (4) under the protective gas environment, uniformly coating the surface of a to-be-lithium-enriched electrode piece with the modified molten lithium to form a lithium-rich layer, and cooling to room temperature to obtain the lithium ion battery lithium-rich electrode piece. The lithium ion battery lithium-rich electrode piece is prepared by the preparation method of the lithium ion battery lithium-rich electrode piece. A lithium ion battery has the characteristics of being low in cost, high-efficiency, high-quality, safe and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-rich pole piece of a lithium ion battery and a preparation method thereof. Background technique [0002] Since the large-scale commercialization of lithium-ion batteries, they have been widely used in portable electronic devices such as laptops, cameras, and mobile phones due to their advantages of high energy density and high power density. However, with the continuous update of the design and more and more integrated functions, people put forward higher requirements for the energy density of lithium-ion batteries. [0003] In order to increase the energy density of lithium-ion batteries, one method is to use high gram capacity negative electrode active materials (such as silicon carbon negative electrode active materials, alloy negative electrode active materials). However, the first coulombic efficiency of these high-capacity negative electrode active materials is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/13
CPCH01M4/0404H01M4/0483H01M4/134H01M4/1395H01M4/366H01M4/382H01M4/62H01M10/052Y02E60/10
Inventor 李白清张盛武陶兴华张柏清
Owner NINGDE AMPEREX TECH
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