Preparation method of nanometer SiC capable of being used as negative electrode material of lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in the field of lithium-ion batteries, can solve problems such as complex synthesis routes, coarse particles, and lack of purity, and achieve the effects of simple process, low energy consumption, and low cost

Active Publication Date: 2020-12-04
TIANNENG SAFT ENERGY JOINT CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the methods mentioned above, as well as preparation methods such as physical and chemical vapor deposition, sol-gel method, etc., have not been able to achieve large-scale commercial application due to the complexity of the synthetic route and high cost.
At present, the

Method used

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  • Preparation method of nanometer SiC capable of being used as negative electrode material of lithium ion battery
  • Preparation method of nanometer SiC capable of being used as negative electrode material of lithium ion battery
  • Preparation method of nanometer SiC capable of being used as negative electrode material of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0045] First weigh 98 parts of isopropanol, 1 part of polyvinyl alcohol, and 0.5 parts of polyethylene glycol, put them into a ball mill tank, stir properly with a glass rod, and then weigh 10 parts of SiO 2 The powder and 15 parts of graphite powder should be properly stirred with a glass rod and then ball milled. After being fully dispersed, take it out and dry it in a drying oven at 100°C. Press it into a 0.4g round cake with a diameter of 12mm under a pressure of 5MPa. , transferred to a high-temperature oven for sintering at 1200°C, the sintering time is 2.5h, and the sintering atmosphere is Ar+3vt%H 2 , in addition, take 550g CaCl 2 2H 2 O was dried in air at 180°C for 48h and then vacuum-dried at the same temperature for 24h, or air-dried at 260°C for 12h and then vacuum-dried at the same temperature for 6h to obtain CaCl 2 , weigh the CaCl prepared in the previous step 2 About 400g is placed in an alumina crucible, and then placed in a vertical high-temperature rea...

Embodiment 2

[0048] First weigh 99 parts of isopropanol, 1.2 parts of polyvinyl alcohol, and 1 part of polyethylene glycol, put them into a ball mill tank, stir properly with a glass rod, and then weigh 5 parts of SiO 2 The powder and 8 parts of graphite powder were properly stirred with a glass rod and started ball milling. After being fully dispersed, they were taken out and dried in an oven at 110°C. Under a pressure of 8MPa, they were pressed into a 1g round cake with a diameter of 18mm. Transfer to a high temperature oven for sintering at 1250°C, the sintering time is 3h, and the sintering atmosphere is Ar+4vt%H 2 , In addition, take 550g CaCl 2 2H 2 O was dried in air at 180°C for 48h and then vacuum-dried at the same temperature for 24h, or air-dried at 280°C for 12h and then vacuum-dried at the same temperature for 6h to obtain CaCl 2 , weigh the CaCl prepared in the previous step 2 About 400g is placed in an alumina crucible, and then placed in a vertical high-temperature react...

Embodiment 3

[0051] First weigh 100 parts of isopropanol, 1.5 parts of polyvinyl alcohol, and 1 part of polyethylene glycol, put them into a ball mill tank, stir properly with a glass rod, and then weigh 10 parts of SiO 2 The powder and 15 parts of graphite powder are properly stirred with a glass rod and started ball milling. After being fully dispersed, take them out and put them in an oven for drying at 120°C. Press them into a 2g round cake with a diameter of 25mm under a pressure of 10MPa. Transfer to a high-temperature oven for sintering at 1300°C, the sintering time is 2.5h-3.5h, and the sintering atmosphere is Ar+6vt%H 2 , in addition, take 550g CaCl 2 2H2O was dried in air at 200°C for 48h and then vacuum-dried at the same temperature for 24h, or air-dried at 300°C for 12h and then vacuum-dried at the same temperature for 6h to obtain CaCl 2 , weigh the CaCl prepared in the previous step 2 About 400g is placed in an alumina crucible, and then placed in a vertical high-temperatu...

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Abstract

The invention discloses a preparation method of nanometer SiC capable of being used as a negative electrode material of a lithium ion battery, belonging to the technical field of lithium ion batteries. The preparation method of the nanometer SiC comprises the following steps: mixing SiO2, graphite, isopropanol, polyvinyl alcohol and polyethylene glycol, carrying out drying and sintering successively to obtain a SiO2/graphite mixture, and carrying out electrodeoxygenation by using molten CaCl2 to synthesize the nanometer SiC material. The nanometer SiC material has a unique nanowire form and uniform element distribution, shows stable charge-discharge properties, has specific capacity and volume capacity higher than the specific capacity and volume capacity of a graphite material and can become the negative electrode material with potential competitiveness for the lithium ion battery; the effects of simple preparation process flow, relatively low cost and relatively low energy consumption can be realized; high-selectivity large-scale production can be realized by controlling process conditions; and the problems of high production temperature, high impurity content of a product, difficulty in batch production and the like when SiC is prepared by a conventional carbothermic reduction method are solved.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, more specifically, relate to a kind of preparation method that can be used as the nanometer SiC of lithium ion battery anode material. Background technique [0002] Lithium-ion batteries dominate the power supply market for portable electronic devices due to their good overall performance (including high operating voltage, high energy density, low self-discharge, and design flexibility). As one of the essential components of lithium-ion batteries, the anode active material must have the ability to conduct ions and electrons, and be able to accommodate a large amount of Li in the structure in a reversible manner. Because the chemical activity of Li embedded in it is only slightly lower than that of Li in the single state, and the volume change is relatively small during the charge-discharge cycle, graphite materials have been the most widely used mainstream anode materials. ...

Claims

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Application Information

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IPC IPC(8): C01B32/97H01M4/583H01M10/0525B82Y30/00B82Y40/00
CPCC01B32/97H01M4/583H01M10/0525B82Y30/00B82Y40/00H01M2004/021H01M2004/027C01P2004/03C01P2006/40Y02E60/10
Inventor 郭鑫陈挺娴周翠芳周建中李明钧林志菲陈飞
Owner TIANNENG SAFT ENERGY JOINT CO
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