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Preparation method for anode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems that materials cannot be synthesized on a large scale, the electrode cycle performance is deteriorated, and the coating effect cannot be achieved, and the phenomenon of product agglomeration can be avoided. , The effect of high temperature residence time is short, which is convenient for large-scale production

Active Publication Date: 2015-01-07
ZHEJIANG NARADA POWER SOURCE CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when lithium is alloyed with a single metal, it will be accompanied by a very large volume expansion, which will lead to poor cycle performance of the electrode and hinder its practical application in lithium-ion batteries.
At present, carbon-coated nano-metal tin is an ideal negative electrode material for lithium-ion secondary batteries, but as far as the current research situation is concerned, there are many problems and difficulties
The most important point is that tin is a metal with a very low melting point. Its melting point is only 231.9 degrees. If you want to complete the carbon coating process on a metal, the temperature must be at least above 400 degrees. High temperature will make it difficult for metallic tin to be coated into the carbon shell, and the obtained product will be a substance separated from carbon and tin, which cannot achieve the ideal coating effect
In addition, the current research is limited by the preparation method, and the material cannot be synthesized on a large scale, resulting in a relatively lagging application development.

Method used

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  • Preparation method for anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Heat the quartz tube to a certain temperature, and pass high-purity argon or nitrogen to keep the temperature in the tube at 1000 degrees, the gas flow rate is constant at 0.2 L / min, and ventilate for 0.5 hours.

[0021] Stir the pre-prepared reaction liquid evenly and put it into an ultrasonic atomizer. The reaction liquid is composed of 1L of methanol, 10g of nickel acetylacetonate, and 80g of stannous chloride.

[0022] Increase the flow rate of the inert gas to 0.5~1L / min, and turn on the power supply of the ultrasonic nebulizer. The particles obtained in the collector are washed with methanol or ethanol, and dried to obtain a tin-nickel-carbon nanocomposite material, which is the negative electrode material of the lithium ion battery.

[0023] The above-prepared composite nano negative electrode material is the positive electrode, the lithium sheet is the counter electrode, the electrolyte is the EC / DMC (Vol 1:1) solution of 1M LiPF6, and the diaphragm is a composi...

Embodiment 2

[0025] Heat the quartz tube to a certain temperature, and pass high-purity argon or nitrogen to keep the temperature in the tube at 1200 degrees, the gas flow rate is constant at 0.2 L / min, and ventilate for 0.5 hours.

[0026] Stir the pre-prepared reaction liquid evenly and put it into an ultrasonic atomizer. The reaction liquid is 1L of methanol, 20g of nickel acetylacetonate, and 100g of tin chloride.

[0027] Increase the flow rate of the inert gas to 0.5~1L / min, and turn on the power supply of the ultrasonic nebulizer. The particles obtained in the collector are washed with methanol or ethanol, and dried to obtain a tin-nickel-carbon nanocomposite material, which is the negative electrode material of the lithium ion battery.

[0028] The above-prepared composite nano negative electrode material is the positive electrode, the lithium sheet is the counter electrode, the electrolyte is the EC / DMC (Vol 1:1) solution of 1M LiPF6, and the diaphragm is a composite diaphragm of ...

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Abstract

The invention relates to a preparation method for a tin-nickel-carbon anode material of a lithium ion battery. The method comprises the following steps of: 1, fully dissolving stannous chloride (SnCl2) into a cosolvent; 2, fully dissolving acetylacetone nickel into a cosolvent; 3, uniformly mixing the cosolvents obtained by the steps 1 and 2, and pouring the mixed solution into an ultrasonic vaporizer; and 4, causing vaporized aerial fog to enter a tube type heating furnace along with an inert gas, and instantly pyrolyzing the aerial fog and the inert gas to obtain the product. The tin-nickel-carbon composite nano material can remarkably ease serious bulk effects produced by the lithium intercalation and deintercalation of a tin-containing active substance, and has relatively higher reversible specific capacity and relatively longer cycle life.

Description

Technical field [0001] The present invention involves a method of preparation of lithium -ion battery negative materials, which specifically involves the preparation method of tin nickel carbon negative materials. technical background [0002] Lithium ion batteries with carbon (graphite) as negative materials have been widely used in high -end consumer electronics products, and the application of electric bicycles and electric vehicles has gradually increased.But the theoretical than carbon material is only 372 mah · g -1 , The volume ratio is only 800 mAh · cm -3 Left and right, and metal lithium 3860 mah · g -1 And 2060 mah · cm -3 The capacity is very different.In order to meet the development needs of modern electronic equipment and electric vehicles for high -capacity compact power supply, people set their sights on the research of new materials.Some materials with higher lithium -storage capacity, such as SN, SI, AL, SB, AG, etc. are all studied widely and in depth. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139B82Y40/00
CPCY02E60/122Y02E60/10
Inventor 李小平康虎强郭锋
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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