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Anode plate for lithium ionic cell and preparation thereof

A technology for lithium ion batteries and negative electrode sheets, which is applied in battery electrodes, electrode manufacturing, active material electrodes, etc., can solve problems such as poor cycle performance of lithium ion batteries, and achieve the effect of alleviating shedding and improving cycle performance.

Inactive Publication Date: 2009-05-06
海宁市盐官工业投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first purpose of the present invention is to overcome the disadvantages of poor cycle performance of the lithium ion battery containing the negative electrode due to the volume change of the existing lithium ion battery negative electrode sheet during intercalation / delithiation, and to provide a lithium ion battery that can contain the negative electrode sheet Negative plate with good cycle performance of lithium ion battery

Method used

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  • Anode plate for lithium ionic cell and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This example illustrates the preparation method of the lithium ion secondary battery negative electrode provided by the present invention.

[0036] (1) Preparation of negative electrode active material

[0037] The raw material silicon of 100 parts by weight (Zhongzhang International Co., Ltd., 5 microns in average particle diameter, purity is 90%) and the raw material copper of 200 parts by weight (Zhongzhang International Co., Ltd., 10 microns in average particle diameter) are added to the planetary ball mill (ND7-2L type Nanjing Nanda Tianzun Electronics Co., Ltd.) ball mill tank, wherein the ratio of the weight of the ball to the total weight of the raw material is 10:1. After sealing the ball mill jar, vacuumize it and fill it with argon as a protective gas, and perform ball milling. The rotating speed of the ball milling is 400 rpm, and the milling time is 30 hours, so as to obtain the negative electrode active material.

[0038] The average particle diameter of ...

Embodiment 2

[0059] This example illustrates the preparation method of the lithium ion secondary battery negative electrode provided by the present invention.

[0060] (1) Preparation of negative electrode active material

[0061] 100 parts by weight of raw material silicon (Zhongzhang International Co., Ltd., 5 microns in average particle diameter, 92% purity) and 60 parts by weight of raw material aluminum (Zhongzhang International Co., Ltd., 20 microns in average particle diameter) are added to the planetary ball mill (ND7-2L Nanjing Nanda Tianzun Electronics Co., Ltd.) ball mill tank, wherein the ratio of the weight of the ball to the total weight of the raw material is 5:1. After sealing the ball mill jar, vacuumize it and fill it with argon as a protective gas, and perform ball milling. The rotating speed of the ball milling is 400 rpm, and the milling time is 30 hours, so as to obtain the negative electrode active material.

[0062] The average particle diameter of the negative ele...

Embodiment 3

[0071] This example illustrates the preparation method of the lithium ion secondary battery negative electrode provided by the present invention.

[0072] (1) Preparation of negative electrode active material

[0073] With 100 parts by weight of raw material silicon (Zhongzhang International Co., Ltd., 5 microns in average particle diameter, the purity is 95%), 50 parts by weight of raw material zinc (Zhongzhang International Co., Ltd., 10 microns in average particle diameter) and 50 parts by weight of Raw material copper (Zhongzhang International Co., Ltd., with an average particle diameter of 10 microns) is added to the ball mill tank of a planetary ball mill (ND7-2L Nanjing Nanda Tianzun Electronics Co., Ltd.), wherein the ratio of the weight of the ball to the total weight of the raw material It is 20:1. After sealing the ball mill jar, vacuumize it and fill it with argon as a protective gas, and perform ball milling. The rotating speed of the ball milling is 400 rpm, and...

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Abstract

The invention provides a negative sheet for a lithium ion battery, which comprises a collector body and a negative active material layer coated on the collector body. The negative active material comprises a component A and a component B. The component A is simple-substance silicon; the component B is one or some of copper, titanium, aluminum, iron, nickel, zinc and cobalt, wherein the negative active material layer is of a porous structure. The invention also provides a preparation method of the negative sheet for the lithium ion battery. The negative active material layer of the negative sheet for the lithium ion battery is of a porous structure, thereby ensuring that the negative active material can carry out volume expansion through a hole, effectively abating the fall-off of the negative active material on the negative sheet, and improving the cycle performance of the lithium ion battery with the negative sheet.

Description

technical field [0001] The invention relates to a battery negative electrode sheet and a preparation method thereof, more specifically to a lithium ion battery negative electrode sheet and a preparation method thereof. Background technique [0002] Due to its small size and high energy density, lithium-ion secondary batteries are widely used as mainstream power sources in electronic products such as mobile communication equipment, digital cameras, and notebook computers. At present, the capacity of the secondary battery of the traditional lithium cobalt oxide / graphite system is close to its theoretical maximum capacity, and it is difficult to increase its volumetric energy density by increasing the dressing density, reducing the thickness of the current collector or separator, etc. With the upgrading of mobile electronic products, there is an urgent requirement for the emergence of ultra-high capacity batteries. [0003] In recent years, silicon has been extensively and met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04H01M4/62H01M4/64
CPCY02E60/12Y02E60/10
Inventor 梁康群陈炎
Owner 海宁市盐官工业投资有限公司
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