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Preparation of tin/tin phosphide/carbon composite material of alkali metal ion battery negative electrode

A technology of carbon composite materials and alkali metal ions, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve the problems of large particle size, incompatibility, and complicated methods, and achieve simple operation, Improved conductivity and low process cost

Active Publication Date: 2020-04-28
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some of today's nanonization and carbon coating methods are relatively complicated, and the two often cannot be balanced
For example, Liu Jianhong and others invented a method for preparing carbon-coated manganese oxide (patent number: CN201410666514.0). This method uses acrylonitrile oligomers as raw materials for carbon coating, which requires multiple heating, stirring and drying , and takes a long time
Lu Xiaoxiao et al. invented a method for preparing SnO2 / amorphous carbon composite material by online pyrolysis and atomization of composite precursors (patent number: CN201810778802.3). This method uses SnO2Alcohol sol and glucose mixture are used as precursors, transformed into aerosol by ultrasonic nebulizer, and then introduced into a quartz tube at 1100-1200°C with carrier gas for cracking. The method is more complicated and the temperature higher than 1000°C makes SnO 2 has a larger particle size

Method used

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  • Preparation of tin/tin phosphide/carbon composite material of alkali metal ion battery negative electrode
  • Preparation of tin/tin phosphide/carbon composite material of alkali metal ion battery negative electrode
  • Preparation of tin/tin phosphide/carbon composite material of alkali metal ion battery negative electrode

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Embodiment 1

[0037] This embodiment relates to a preparation method of a tin / tin phosphide / carbon composite material, comprising the following steps:

[0038] Step 1, cross-linking reaction: 3 g of sodium alginate was dissolved in 197 ml of deionized water to prepare a solution with a mass fraction of 1.5%. Sodium chloride and crystalline tin tetrachloride with a sodium:tin molar ratio of 3:1 were dissolved in 500ml of deionized water to prepare a solution with a tin ion concentration of 0.15mol / L. Sodium alginate was slowly dropped into the aqueous solution of metal ions, stirred and reacted for 24 hours, and waited for the complete completion of the cross-linking reaction. The cross-linked product was rinsed three times with deionized water, then placed in a freeze dryer, and freeze-dried at -60°C for 24 hours.

[0039]Step 2, carbonization: transfer the freeze-dried sodium alginate pellets to a tube furnace, raise the temperature to 550°C at a rate of 5°C / min in a nitrogen atmosphere, ...

Embodiment 2

[0044] This embodiment relates to a preparation method of a tin / tin phosphide / carbon composite material, comprising the following steps:

[0045] Step 1, cross-linking reaction: 2 g of sodium alginate was dissolved in 198 ml of deionized water to prepare a solution with a mass fraction of 1%. Sodium chloride and crystalline tin tetrachloride with a molar ratio of 1:1 were dissolved in 500ml of deionized water to prepare a solution with a tin ion concentration of 0.10mol / L. Sodium alginate was slowly dropped into the metal ion aqueous solution, stirred for 36 hours, and waited for the cross-linking reaction to complete. The cross-linked product was rinsed with deionized water three times, then placed in a freeze dryer, and freeze-dried at -50°C for 24 hours.

[0046] Step 2, carbonization: transfer the freeze-dried sodium alginate pellets to a tube furnace, raise the temperature to 500°C at a rate of 5°C / min in a nitrogen atmosphere, and keep it warm for 1 hour to obtain a tin...

Embodiment 3

[0050] This embodiment relates to a preparation method of a tin / tin phosphide / carbon composite material, comprising the following steps:

[0051] Step 1, cross-linking reaction: 3 g of sodium alginate was dissolved in 147 ml of deionized water to prepare a solution with a mass fraction of 2%. Sodium chloride and crystalline tin tetrachloride with a molar ratio of 5:1 were dissolved in 500ml of deionized water to prepare a solution with a tin ion concentration of 0.2mol / L. Sodium alginate was slowly dropped into the aqueous solution of metal ions, stirred and reacted for 48 hours, and waited for the complete completion of the cross-linking reaction. The cross-linked product was rinsed three times with deionized water, then placed in a freeze dryer, and freeze-dried at -70°C for 72 hours.

[0052] Step 2, carbonization: transfer the freeze-dried sodium alginate pellets to a tube furnace, raise the temperature to 1200°C at a rate of 10°C / min in a nitrogen atmosphere, and keep it...

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Abstract

The invention discloses preparation of a tin / tin phosphide / carbon composite material of an alkali metal ion battery negative electrode, which mainly comprises the steps of firstly, crosslinking sodiumalginate and tetravalent tin ions, then freeze-drying a crosslinking product by using sodium chloride as an inhibitor, carbonizing the product in an inert atmosphere, and then phosphating the productby using sodium hypophosphite to obtain the tin / tin phosphide / carbon composite material. According to the invention, nano-sized tin oxide particles are produced by a sodium alginate crosslinking method and wrapped by the graphitized carbon, a relatively good pore channel structure is formed in the macromolecular cracking process, the structure is reserved while the tin / tin phosphide / carbon composite material is obtained by using gaseous phosphating, so that the prepared composite material has good pore channels and conductivity, tin expansion can be effectively inhibited, and the tin / tin phosphide / carbon composite material has good cycle performance and rate capability when being applied to an alkali metal ion battery. The method is simple to operate, low in process cost and easy for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of preparation of negative electrode materials for alkali metal ion batteries, in particular to the preparation of a tin / tin phosphide / carbon composite material for the negative electrode of alkali metal ion batteries. Background technique [0002] Lithium ion battery is the most famous alkali metal ion battery, which is a kind of secondary battery, which has the advantages of high energy density, environmental friendliness and good safety. At present, the negative electrode used in lithium-ion batteries is mainly graphite, which is low in cost but small in capacity. With the increase in energy storage requirements, graphite is difficult to meet the current needs. Therefore, it is imminent to develop new anode materials. [0003] Tin-based materials have become a promising anode material for alkali metal ion batteries due to their environmental friendliness and high specific capacity, but their volume expan...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/387H01M4/625H01M4/628H01M4/5805H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 刘庆雷赖升华张旺顾佳俊张荻
Owner SHANGHAI JIAO TONG UNIV
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