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Stannum-carbon composite material used for lithium ion battery cathode, preparation method thereof and lithium ion battery

A technology of lithium-ion batteries and composite materials, which is applied in the field of battery manufacturing, can solve the problems of material performance cracking and the inability to effectively alleviate the volume effect of tin materials, etc., and achieve the effects of low cost, easy implementation, and good reproducibility

Active Publication Date: 2013-12-18
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is just a simple carbon-coated tin material, which cannot effectively alleviate the volume effect of tin materials, so it is not very good for improving the cycle performance of such materials. As the number of cycles increases, the material properties will further crack

Method used

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  • Stannum-carbon composite material used for lithium ion battery cathode, preparation method thereof and lithium ion battery
  • Stannum-carbon composite material used for lithium ion battery cathode, preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Preparation of porous catechol formaldehyde resin

[0038] Add 2.20g catechol, 2ml formaldehyde (37wt%) and 5ml concentrated hydrochloric acid into 10ml ethanol together, the molar ratio of phenolic monomer and aldehyde monomer is about 1:1, stir to make it dissolve completely, put the above solution into Put it into a 50ml autoclave, keep it warm at 100°C for 5 hours, and obtain a porous polymer catechol formaldehyde resin gel through the synthesis reaction; the obtained gel is crushed, dried at 80°C for 18 hours, and the vacuum degree is -0.1MPa to obtain Porous catechol formaldehyde resin, the obtained material is ground into powder with a mortar for use.

[0039] Gained porous macromolecule phenolic resin scanning electron micrograph is as follows figure 1 a, 1b shown by figure 1 b It can be seen that the sample has a honeycomb structure, the pores are small and dense, the pores are cross-linked and interconnected, and the distribution is relatively uniform. ...

Embodiment 2

[0048] (1) Preparation of porous hydroquinone formaldehyde resin

[0049] Add 3.30g of hydroquinone, 12ml of formaldehyde (37wt%) and 6ml of concentrated sulfuric acid into 20ml of ethanol, the molar ratio of phenol monomer and aldehyde monomer is about 1:4, stir to make it completely dissolved, and put the above solution into Put it into a 50ml high-pressure reactor, keep it warm at 120°C for 10 hours, and obtain a porous polymer hydroquinone formaldehyde resin gel through the synthesis reaction; crush the resulting gel, and dry it in vacuum at 120°C for 6 hours, with a vacuum degree of -0.1MPa. Porous hydroquinone formaldehyde resin, the resulting material is ground into powder with a mortar for use.

[0050] (2) Configuration of tin-containing chloride salt solution

[0051] Prepare 10mL SnCl 2 solution, the concentration of tin in the solution is 3mol / L.

[0052] (3) Preparation of tin-containing polymer resin

[0053] Add 6 g of the porous polymer phenolic resin prepa...

Embodiment 3

[0058] (1) Preparation of porous hydroquinone-catechol-benzaldehyde resin

[0059] Add 2.2g of hydroquinone, 1.1g of catechol, 6ml of benzaldehyde, and 5ml of nitric acid into 20ml of deionized water. The molar ratio of phenolic monomers to aldehyde monomers is about 1:2. Stir to dissolve completely. Put the above solution into a reaction kettle, keep it warm at 30°C for 30 days, mash the obtained gel, and dry it in vacuum at 100°C for 12 hours, the vacuum degree is -0.1MPa, porous hydroquinone-catechol-benzaldehyde Resin, the resulting material is ground into powder with a mortar for use.

[0060] (2) Configuration of tin-containing chloride salt solution

[0061] Prepare 30mL SnCl 4 ·5H 2 O solution, the concentration of tin in the solution is 1mol / L.

[0062] (3) Preparation of tin-containing polymer resin

[0063] Add 5 g of the porous macromolecule phenolic resin prepared in step (1) into the tin salt solution of step (2), that is, the mass ratio of phenolic resin to...

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Abstract

The invention provides a stannum-carbon composite material used for lithium ion battery cathodes and a preparation method thereof, and provides a lithium ion battery assembled with the stannum-carbon composite material prepared by the method as an electrode. According to the invention, phenol monomers and aldehyde monomers are used to prepare porous high molecular phenolic resins with high pore volume and high specific surface; on the basis of the porous high molecular phenolic resins, the stannum-carbon composite material with a small particle size, high bonding strength, high specific capacity and stable electrochemical performance is prepared. According to an optimal embodiment in the invention, the initial discharge specific capacity of the cathode material can reach 605 mAh / g and has a specific capacity of 453 mAh / g after 20 cycles.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a tin-carbon composite material for a negative electrode of a lithium ion battery, a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, the lithium-ion batteries used in production mainly use graphitized carbon as the negative electrode material, but the lithium storage capacity of graphite materials is not high. As far as graphite-based negative electrode materials are concerned, their large layered structure voids not only provide a place for lithium storage, but also determine the characteristics of the material's low theoretical specific capacity (about 372mAh / g). Therefore, the development of new high-capacity and high-rate anode materials has high research and application value. Research on negative electrode materials has found that metals or alloy materials that can form alloys with lithium, such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/139H01M10/0525
CPCY02E60/10
Inventor 朱广燕陈效华
Owner CHERY AUTOMOBILE CO LTD