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Negative electrode material of lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve the problems of volume effect, battery specific capacity and small room for improvement of charge and discharge performance, achieve good cycle performance, improve specific capacity and repeated charge and discharge performance, and good The effect of stability

Active Publication Date: 2013-07-24
福建杉杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome that the existing lithium-ion batteries usually use graphite as the negative electrode material, so that the specific capacity and charge-discharge performance of the battery have little room for improvement, while the traditional silicon-based negative electrode materials will produce volume effects during use. defects, thus providing a new negative electrode material for lithium-ion batteries and its preparation method

Method used

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  • Negative electrode material of lithium ion battery and preparation method thereof
  • Negative electrode material of lithium ion battery and preparation method thereof
  • Negative electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of negative electrode material:

[0023] Polyacrylamide (molecular weight = 10 million) and polysiloxane (molecular weight = 60000) were mixed according to the ratio of 40:60 by weight, and then the mixture was placed in a nitrogen atmosphere at a temperature of 300 ° C for 1 hour; after cooling, The low-temperature heat-treated mixture was further cracked at a temperature of 900° C. for 1 hour in an argon atmosphere. The cracked product is crushed and passed through a 400-mesh sieve to obtain the product. figure 1 is the SEM photograph of the synthesized product. From figure 1 It can be seen that the morphology of the obtained product is irregular. figure 2 is the XRD spectrum of the product. figure 2 There are neither the diffraction peaks of silicon grains nor the diffraction peaks of graphitic carbon, indicating that each component exists in an amorphous form and belongs to an amorphous structure.

[0024] Electrode preparation: the resulting prod...

Embodiment 2

[0028] Negative material preparation:

[0029] Polyacrylamide (molecular weight = 10 million) and polysiloxane (molecular weight = 60000) were mixed according to the ratio of 50:50 by weight, and then the mixture was placed in a nitrogen atmosphere at a temperature of 300 ° C for heat treatment for 1 hour; after cooling, The low-temperature heat-treated mixture was further cracked at a temperature of 1100° C. for 1 hour in an argon atmosphere. The cracked product is crushed and passed through a 400-mesh sieve to obtain the product. XRD test shows that the product belongs to amorphous structure.

[0030] Electrode performance test:

[0031] According to the same electrochemical test method as in Example 1, the first lithium intercalation capacity of the material was 990mAh / g, the reversible delithiation capacity was 684mAh / g, and the first coulombic efficiency was 69%. After 10 cycles, the reversible delithiation capacity is 540mAh / g, which is 78.9% of the initial capacity. ...

Embodiment 3

[0033] Negative material preparation:

[0034]Polyacrylamide (molecular weight = 10 million) and polysiloxane (molecular weight = 60000) were mixed according to the ratio of 10:90 by weight, and then the mixture was placed in a nitrogen atmosphere at a temperature of 200 ° C for 10 hours; after cooling, The low-temperature heat-treated mixture was further cracked at a temperature of 800° C. for 15 hours in an argon atmosphere. The cracked product is pulverized and passed through a 500-mesh sieve to obtain an amorphous negative electrode material.

[0035] Electrode performance test:

[0036] According to the same electrochemical test method as in Example 1, the first lithium intercalation capacity of the material was 1682mAh / g, the reversible delithiation capacity was 925mAh / g, and the first coulombic efficiency was 55%. After 10 cycles, the reversible delithiation capacity is 470mAh / g, which is 57% of the initial capacity. The reversible capacity of the material is higher ...

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Abstract

The invention provides a novel preparation method of a negative electrode material of a lithium ion battery. The method comprises the following steps: (1) mixing an organic nitrogen source with polysiloxane at a weight ratio of (10: 90)-(90: 10) to obtain a mixture; (2) carrying out a thermal treatment on the mixture at 200 to 500 DEG C in an inert gas atmosphere; and (3) splitting, crushing and sieving in the inert gas atmosphere. The invention further provides the negative electrode material of the lithium ion battery prepared by the method. According to the invention, the shortages that the improvement spaces for the specific capacity and charge and discharge properties of the existing lithium ion battery are small by using graphite as a negative electrode material generally, and the volume effect of a traditional silicon negative electrode material generated in the application process are overcame, and the negative electrode material which is capable of improving the specific capacity of a lithium ion battery and providing an excellent circulation performance and a rate discharge performance to the lithium ion battery is provided.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a negative electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of secondary chemical power source, which has the characteristics of high energy density, small size, and environmental friendliness. Since the advent of lithium-ion batteries in 1990, after nearly two decades of development, lithium-ion batteries have greatly improved in terms of capacity performance, high-current performance and safety performance compared with earlier lithium-ion batteries. Now lithium-ion batteries have been widely used in small portable electrical appliances, such as mobile phones, handheld computers, CD players and other fields. However, with the advancement of technology and the emergence of new electronic devices, people have put forward much higher requirements for the performance of batteries. For exam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/13
CPCY02E60/122Y02E60/10
Inventor 李智华乔永民沈龙杜辉玉吴志红
Owner 福建杉杉科技有限公司
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