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Compound for anode material of lithium ion secondary battery and preparation method thereof

A secondary battery and negative electrode material technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as unsuitable for industrial production, affecting electrochemical performance, complicated process, etc., and achieves significant practical value and good performance. Industrial application prospect, the effect of simple process

Inactive Publication Date: 2010-06-09
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned process is complicated and not suitable for industrial production. At the same time, the large change after lithium intercalation also affects the electrochemical properties of other alloy materials (such as Si, Sb, Al, etc.), which will cause battery capacity decay.

Method used

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  • Compound for anode material of lithium ion secondary battery and preparation method thereof
  • Compound for anode material of lithium ion secondary battery and preparation method thereof
  • Compound for anode material of lithium ion secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix 1.4g (1.2g) Sn powder and 0.4g (0.6g) nano-SiC powder evenly, ball mill for 20h under the protection of high-purity argon, cool to room temperature naturally, take out the product and mix with 0.2g graphite. Under the protection of high-purity argon, the planetary ball milled for 6 hours, and after cooling to room temperature naturally, the ball mill jar was opened under an inert atmosphere, and the target product SiC was obtained. 20 sn 70 C 10 (SiC 30 sn 60 C 10 ). Obtained SiC 20 sn 70 C 10 The TEM image of the composite material is shown in figure 1 shown; the resulting SiC 30 sn 60 C10 The cycle performance of composite materials such as figure 2 shown.

[0034] From figure 1 From the picture on the left, it can be seen that the material synthesized by this method has a uniform and regular near-spherical structure, with a particle size of 60-70nm and a uniform distribution; from the picture on the right, it can be seen that each spherical particle...

Embodiment 2

[0037] Mix 1.4g of Sb powder and 0.4g of nano-SiC powder evenly, perform high-energy ball milling for 20h under the protection of high-purity argon, and cool to room temperature naturally, then take out the product and mix with 0.2g of graphite. Under the protection of high-purity argon, the planetary ball milled for 6 hours, and after naturally cooling to room temperature, the ball mill jar was opened under an inert atmosphere to obtain the target product SiC 20 Sb 70 C 10 .

[0038] The resulting composite material at 100mA g -1 The reversible capacity in the first week under the current density is 590mAh g -1 , after 160 cycles, the capacity retention rate was 70%.

Embodiment 3

[0040] Mix 0.6g Sn powder, 0.6g Al powder, and 0.6g nano-SiC powder evenly, and high-energy ball mill for 20h under the protection of high-purity argon. After cooling to room temperature naturally, take out the product and mix with 0.2g graphite. Under the protection of high-purity argon, the planetary ball milled for 6 hours, and after naturally cooling to room temperature, the ball mill jar was opened under an inert atmosphere to obtain the target product SiC 30 Al 30 sn 30 C 10 . The cyclability of the resulting product composites is as image 3 .

[0041] From image 3 It can be seen that the resulting composite exhibits excellent electrochemical performance, with 100 mAg -1 The reversible capacity in the first week under the current density is 318mAhg -1 , after 200 cycles, the capacity retention rate is higher than 86%.

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Abstract

The invention discloses a compound for an anode material of a lithium ion secondary battery, the compound comprises a sandwich-like structure, an inner layer of the sandwich-like structure uses a hard abrasive, an intermediate layer adopts an embeddable metal or a non-metal or an alloy, and an outer layer adopts a soft conductive material, wherein the embeddable metal or the non-metal or the alloy accounts for 30-90wt% of the total weight of the compound; the hard abrasive accounts for 5-60wt% of the total weight of the compound; and the soft conductive material accounts for 5-60wt% of the total weight of the compound. The prepared anode material compound comprises the sandwich-like nanostructure, and the distribution is even, thereby having excellent cycling performance and rate capability. The preparation method has the advantages of simple process, easy control and abundant raw materials, thereby being a practical technology for preparing the lithium ion metal or alloy anode material.

Description

technical field [0001] The invention belongs to the field of energy materials and technology, and in particular relates to a compound used for negative electrode materials of lithium-ion secondary batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as notebook computers, mobile phones, and digital cameras due to their high specific capacity, long cycle life, wide operating temperature range, small self-discharge, and no memory effect. Due to the close attention of the whole society to environmental issues, various industries are vigorously promoting the application of clean energy. At present, the positive and negative electrode materials used in lithium-ion batteries cannot meet the requirements of high energy density and high power density for power vehicles. At present, commercialized lithium-ion batteries mostly use graphite as the negative electrode, but the theoretical spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 曹余良陈重学杨汉西艾新平
Owner WUHAN UNIV
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