Method for preparing silicon stannum alloy cathode material of lithium ion battery

A lithium-ion battery and alloy negative electrode technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of poor battery cycle, volume expansion of alloy negative electrode materials, etc., achieve high specific energy, reduce production energy consumption, and simple process easy effect

Inactive Publication Date: 2009-08-19
广州鸿森材料有限公司
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Problems solved by technology

[0022] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for preparing a silicon-tin alloy negative electrode material in a lithium-ion battery, which can solve the problem of poor battery cycle caused by the volume expansion of the alloy negative electrode material, and can obtain high specific capacity and good cycle performance. Preparation method of good alloy negative electrode material

Method used

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  • Method for preparing silicon stannum alloy cathode material of lithium ion battery

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Effect test

Embodiment 1

[0042] (1) Take 5mL with a concentration of 1.0mol L -1 Ammonia solution, 100mL methanol and 20mL water were mixed and stirred for 0.5h, 6.25mL methyl silicate was added to the mixture and stirred for 3h, the resulting suspension was centrifuged, washed with deionized water, and dried to obtain silica balls.

[0043] (2) 11.46g urea and 1.7g Na 2 SnO 3 ·3H 2 O was dissolved in 200 mL of deionized water, then 18 mL of ethanol was added thereto, stirred, and a milky suspension was obtained. 3.82 g of the product of step (1) was ultrasonically dispersed in 4 mL of deionized water for 0.5 h at a molar ratio of Sn:Si:urea=1:10:30 to obtain a suspension. The mixture obtained after mixing the two suspensions was transferred to a 300mL high-pressure furnace, heated at 2 atmospheres and 100°C for 2h, cooled, centrifuged, washed, and dried. Take 240mg of the dried product, and 1.3ml, 2mol / L KOH solution in molar ratio (Sn+Si):OH - =1:2, reacted for 2 hours, corroded 60% of the prod...

Embodiment 2

[0047] (1) Take 5mL with a concentration of 1.0mol L -1 Ammonia solution, 100mL ethanol and 20mL water were mixed and stirred for 0.5h, 5mL methyl silicate was added to the mixture and stirred for 10h, the obtained suspension was centrifuged, washed with deionized water, and dried to obtain silica balls.

[0048] (2) 11.46g urea and 1.7g Na 2 SnO 3 ·3H 2 O was dissolved in 200 mL of deionized water, then 18 mL of ethanol was added thereto, stirred, and a milky suspension was obtained. 3.82 g of the product of step (1) was ultrasonically dispersed in 4 mL of deionized water for 1 h at a molar ratio of Sn: Si: urea = 1:10:30 to obtain a suspension. The mixture obtained after mixing the two suspensions was transferred to a 300mL high-pressure furnace, heated at 3 atmospheres and 500°C for 12h, cooled, centrifuged, washed and dried. Take 240mg of the dried product, and 1.3ml, 2mol / L KOH solution in molar ratio (Sn+Si):OH - =1:2, reacted for 10 hours, corroded 60% of the produ...

Embodiment 3

[0052] (1) Take 5mL with a concentration of 1.0mol L -1 urea solution, 100mL amyl alcohol and 20mL water were mixed and stirred for 0.5h, 5mL methyl silicate was added to the mixture and stirred for 7h, the obtained suspension was centrifuged, washed with deionized water, and dried to obtain silica balls.

[0053] (2) 11.46g g urea and 1.7g Na 2 SnO 3 ·3H 2 O was dissolved in 200 mL of deionized water, then 18 mL of ethanol was added thereto, stirred, and a milky suspension was obtained. 3.82 g of the product of step (1) was ultrasonically dispersed in 4 mL of deionized water for 1 h at a molar ratio of Sn: Si: urea = 1:10:30 to obtain a suspension. The mixture obtained after mixing the two suspensions was transferred to a 300mL high-pressure furnace, heated at 2 atmospheres and 500°C for 12h, cooled, centrifuged, washed and dried. Take 240mg of the dried product, and mix it with 1.3ml, 2mol / L NaOH solution in molar ratio (Sn+Si):OH - =1:2, reacted for 12 hours, corroded ...

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Abstract

The invention discloses a preparation method for a silicon-tin alloy cathode material in a Li-ion battery. The preparation method comprises the following steps: an oxide ball of silicon is taken as a template, a silicide intermediate coated with tin oxides is prepared at first, and the silicide intermediate is coated with carbon, and then deoxidized to produce the cathode material of nanometer silicon-tin alloy. The preparation method has simple process and rich material sources. The high temperature reaction atmosphere adopted by the preparation method can shorten the reaction time and promote the reaction efficiency. And the material produced by the method has high actual capacity and excellent cycle performance. The preparation method is applicable to the industrialized production of the silicon-tin alloy of Li-ion battery cathode material.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, in particular to a preparation method of a silicon-tin alloy negative electrode material in a lithium ion battery. Background technique [0002] Since lithium-ion batteries were commercialized by Japan's Sony Corporation in 1991, research on lithium-ion batteries has been changing with each passing day. At present, the industrialization of mobile phones, notebook computers, digital cameras, electric bicycles, and electric vehicles can all use lithium-ion batteries as power sources. And, the demand for it is growing faster and faster. In the near future, with the continuous development of the battery industry, electric vehicles (EV) and hybrid vehicles (HEV) can use lithium-ion batteries, which will bring broad application prospects to the electric vehicle industry and even military fields such as aerospace. , which is a leap forward in the research of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/38B22F1/02B22F9/24B22F9/06
CPCY02E60/12Y02E60/10
Inventor 李倩倩申国培
Owner 广州鸿森材料有限公司
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