Titanium diboride coated silicon carbon material, preparation method and application thereof

A technology of titanium diboride and silicon carbon materials, applied in electrical components, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems of poor cycle performance of silicon carbon materials, and achieve increased rate performance, improved conductivity, and acid resistance strong effect

Pending Publication Date: 2021-04-09
YINLONG ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a silicon carbon material coated with titanium diboride and its preparation method and application, to solve the problem of poor cycle performance of the silicon carbon material in the prior art

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  • Titanium diboride coated silicon carbon material, preparation method and application thereof
  • Titanium diboride coated silicon carbon material, preparation method and application thereof
  • Titanium diboride coated silicon carbon material, preparation method and application thereof

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preparation example Construction

[0027] The aforementioned titanium diboride-coated silicon-carbon material of the present application may be coated by a conventional coating method, for example, the silicon-carbon material is prepared first, and then reacted in situ on it to form a titanium dioxide coating layer. In order to improve the bonding strength between layers, in another typical embodiment of the present application, a method for preparing a titanium diboride-coated silicon carbon material is provided, the preparation method comprising: step S1, Prepare silicon-carbon composite material precursor; step S2, prepare titanium diboride precursor solution; step S3, mix silicon-carbon composite material precursor and titanium diboride precursor solution, spray dry, and obtain titanium diboride coating The silicon carbon material precursor; step S4, sintering the silicon carbon material precursor covered with titanium diboride, to obtain the silicon carbon material covered with titanium diboride.

[0028] ...

Embodiment 1

[0040] (1) Add nano-silica powder with an average particle size of 50nm, mesocarbon microspheres with an average particle size of 10μm, and polyvinyl alcohol into deionized water at a mass ratio of 1:6:1 for mixing and dispersion to obtain silicon carbon Slurry, the solid content of the slurry is 20%, then the slurry is spray-dried, and after sieving, the mesophase carbon microsphere precursor coated with nano-silicon is obtained, and its thickness is recorded in Table 1;

[0041] (2) Add citric acid, ethylene glycol, and water-based polyurethane to deionized water according to the mass ratio of 1:1:1, and stir until completely dissolved to obtain a mixed solution;

[0042] (3) adding diboron trioxide and titanium tetrachloride to the mixed solution according to a mass ratio of 1:1, and stirring at 55° C. until completely dissolved to obtain a titanium diboride precursor solution;

[0043] (4) In the titanium diboride precursor solution in step (3), the mass ratio of the mesop...

Embodiment 2

[0046] (1) Add nano-silica powder with an average particle size of 50nm, mesocarbon microspheres with an average particle size of 10μm, and polyvinyl alcohol into deionized water at a mass ratio of 1:6:1 for mixing and dispersion to obtain silicon carbon Slurry, the solid content of the slurry is 22%, and then the slurry is spray-dried and sieved to obtain a nano-silicon-coated mesophase carbon microsphere precursor. The average thickness of the silicon layer is recorded in Table 1;

[0047] (2) Add citric acid, ethylene glycol, and water-based polyurethane to deionized water according to the mass ratio of 1:1:1, and stir until completely dissolved to obtain a mixed solution;

[0048] (3) adding diboron trioxide and titanium tetrachloride to the mixed solution according to a mass ratio of 1:1, and stirring at 55° C. until completely dissolved to obtain a titanium diboride precursor solution;

[0049] (4) In the titanium diboride precursor solution in step (3), the mass ratio ...

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Abstract

The invention provides a titanium diboride coated silicon carbon material, a preparation method and application thereof. The material comprises a silicon-carbon core and a titanium diboride layer coated to the silicon-carbon core. Titanium diboride has the characteristics of good conductivity, stable structure, strong acid resistance and the like, and can be tightly connected with carbon and silicon to form a composite material with a stable structure, so that the volume expansion of the silicon material is effectively inhibited; and by forming the structure that the silicon-carbon core is coated with the titanium diboride, the surface impedance of the silicon-carbon material is reduced, and the conductivity of the silicon-carbon material is effectively improved, so that the high energy density of the battery is ensured under the action of the two aspects, and the rate capability, the cycle performance and the high-temperature storage performance of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a titanium diboride-coated silicon carbon material and a preparation method and application thereof. Background technique [0002] At present, due to its high energy density, wide operating voltage range, and no memory effect, lithium-ion batteries are used in many fields of life, such as new energy vehicles, energy storage, 3C digital electronic products, power tools, etc. As the energy density requirements for lithium-ion power batteries are getting higher and higher, silicon-carbon materials with high specific capacity have begun to replace traditional carbon materials and are used on the negative electrode of power batteries, but the single-coated silicon-carbon materials themselves also have Obvious shortcomings, such as low electrical conductivity, large volume expansion during charging and discharging, and the resulting problems of poor battery rate and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M10/052
CPCH01M4/134H01M4/366H01M4/386H01M4/62H01M4/624H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 何海平詹世英张正李海军蔡惠群
Owner YINLONG ENERGY CO LTD
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