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Nano metal tin and graphite composite negative electrode material and preparation method thereof

A technology of nano metal and negative electrode material, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of using toxic substances, high production cost, complicated process, etc., and achieve less impurities in the product, The effect of low cost and simple preparation process

Active Publication Date: 2016-04-06
JIANGSU JICUI ANTAI CHUANGMING ADVANCED ENERGY MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nanomaterials prepared by these methods have some disadvantages, such as high production cost, low output, complicated process, a large amount of toxic substances used in the production process, and the products often contain SnO 2 and SnO impurities, these shortcomings greatly limit their application

Method used

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  • Nano metal tin and graphite composite negative electrode material and preparation method thereof
  • Nano metal tin and graphite composite negative electrode material and preparation method thereof
  • Nano metal tin and graphite composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation method of composite material:

[0040] 1) with SnO 2 (1-10 microns in particle size) and graphite (10-15 microns in particle size) as raw materials, a total of 10 grams, of which graphite and SnO 2 The weight ratio is 3:2; put the above raw materials and 300 grams of stainless steel metal grinding balls (30:1) into the grinding jar, and fill it with 1 bar of argon (Ar) for protection. Put the ball mill jar filled with samples on the ball mill, the ball milling conditions: the ball milling speed is about 350rpm, the ball milling time is 20 hours, and the particle size of the obtained mixed powder is 0.5-2 microns.

[0041] 2) Put the ball-milled sample, that is, the mixed powder, into a high-temperature tube furnace, and in a reducing atmosphere (H 2 ) protection, calcination at a high temperature of 700°C, and heat preservation for 4 hours to obtain a composite negative electrode material A of nano-metal tin and graphite.

[0042] In this embodiment, the ...

Embodiment 2

[0049] Preparation method of composite material:

[0050] 1) The preparation of the mixed powder is the same as in Example 1;

[0051] 2) Put the ball-milled mixed powder into a high-temperature tube furnace, and in a reducing atmosphere (H 2 ) protection, calcination at a high temperature of 800° C., and heat preservation for 4 hours to obtain a composite negative electrode material B of nano-metal tin and graphite.

[0052] Material B obtained by the above method, such as Figure 5 and 6 As shown, the nano-metal tin particles are evenly distributed in the graphite matrix, and the average particle size of the nano-tin particles is 80nm.

[0053] The molar ratio of carbon and tin in the composite negative electrode material is 18:1; Image 6 It can be seen that the diffraction peak of tin oxide in the diffraction peak of the sample after calcination disappeared, showing the diffraction peak of metal tin, which is due to the reaction of tin oxide and carbon to generate Sn; ...

Embodiment 3

[0056] Preparation method of composite material:

[0057] 1) The preparation of the mixed powder is the same as in Example 1;

[0058] 2) Put the ball-milled mixed powder into a high-temperature tube furnace, and in a reducing atmosphere (H 2 ) protection, calcination at a high temperature of 900° C., and heat preservation for 4 hours to obtain nano-metal tin and graphite composite negative electrode material C.

[0059] Material C obtained by the above method, such as Figure 7 and 8 As shown, the nano-metal tin particles are uniformly distributed in the graphite matrix, and the average particle size of the nano-tin particles is 90nm.

[0060] The molar ratio of carbon and tin in the composite negative electrode material is 18:1; Figure 8 It can be seen that the diffraction peak of tin oxide in the diffraction peak of the sample after calcination disappeared, showing the diffraction peak of metal tin, which is due to the reaction of tin oxide and carbon to generate Sn; t...

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Abstract

The invention discloses a nano metal tin and graphite composite negative electrode material and a preparation method thereof. The nano metal tin particles are evenly distributed into graphite matrix, wherein the mean grain size of the nano metal tin particles is within 100nm; the molar ratio of carbon to tin in the composite negative electrode material is (12:1) to (112:1). The preparation method comprises the following steps: firstly, mixing the raw material tin oxide with graphite powder according to a certain ratio; grinding by a mechanical ball milling method, so as to obtain mixed powder with a fixed grain size, and then burning the obtained mixed powder at certain temperature to carry out carbothermic reduction reaction, so as to obtain the composite negative electrode material disclosed by the invention. The negative electrode material is good in electrochemical property, and high in capacity retention ratio; raw materials in the preparation method are easily available, low in cost, free of poison, easy to control, free of pollution on environment, high in product purity, simple in technology, and convenient to operate, and the nano metal tin and graphite composite negative electrode material is easy for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery electrode materials, and in particular relates to an in-situ synthesized nano-metal tin and graphite composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become an internationally recognized ideal chemical energy source due to their outstanding advantages such as high working voltage, high specific energy, large capacity, small size, and no pollution. They are widely used in mobile phones, laptops and other electronic products, and the growing electric vehicles The field will bring more room for development of lithium-ion batteries. [0003] The negative electrode material is one of the keys that affect the performance of lithium-ion batteries. At present, carbon materials widely used have good cycle life, but their theoretical capacity is small (372mAh / g), and their volume specific capacity has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/48B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/38H01M4/628Y02E60/10
Inventor 曾宏武英赵海花况春江周少雄
Owner JIANGSU JICUI ANTAI CHUANGMING ADVANCED ENERGY MATERIALS RES INST CO LTD