Double-particle-size pitch repeatedly-coated shaped graphite silicon-carbon negative electrode material as well as preparation method and application of graphite silicon carbon negative electrode material

A negative electrode material, multiple coating technology, applied in the direction of nanotechnology for materials and surface science, negative electrodes, battery electrodes, etc., can solve the unsatisfactory coating effect of porous graphite, the difficulty of compounding nano-silicon, Poor material conductivity and other issues, to avoid nano-silicon exposure, improve high-rate discharge capacity, and good conductivity

Active Publication Date: 2021-06-29
浙江锂宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, among most silicon-carbon anode materials in the market, hot melt carbonization is the most common way to coat silicon, and single coating is more common, but the disadvantage of single carbon coating is that the carbon layer is thin, which is difficult for silicon to The resulting volume expansion is easy to break the carbon layer, resulting in direct contact between silicon and electrolyte, resulting in capacity loss and safety hazards; in addition, the single carbon coating is not satisfactory for the coating of porous graphite, and for micropores and mesoporous The coating is relative

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  • Double-particle-size pitch repeatedly-coated shaped graphite silicon-carbon negative electrode material as well as preparation method and application of graphite silicon carbon negative electrode material
  • Double-particle-size pitch repeatedly-coated shaped graphite silicon-carbon negative electrode material as well as preparation method and application of graphite silicon carbon negative electrode material

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Embodiment 1

[0027] This embodiment 1 provides a method for preparing a graphite silicon carbon negative electrode material coated with double particle size pitch multiple times, which specifically includes the following steps:

[0028] (1) Place shaped graphite (1600g) with a D50 average particle size of 17μm in a chemical vapor deposition furnace, pump it to a vacuum state, fill it with nitrogen at a rate of 12L / h, and raise the temperature to 420°C at a rate of 8°C / min. After reaching 420°C, fill in silane at a rate of 25L / h, keep the temperature for 2 hours, close the silicon source gas pipeline, enter the automatic cooling program, and take it out after cooling down to normal temperature to obtain shaped graphite with deposited nano-silicon;

[0029] (2) Combine 900g of shaped graphite deposited with silicon, and 100g of mesophase pitch, with an average particle size of D50 of 5.72μm, a rotation speed of 900r / min, and a stirring time of 20min. With circulating water to stabilize t

Embodiment 2

[0033] This embodiment 1 provides a method for preparing a graphite silicon carbon negative electrode material coated with double particle size pitch multiple times, which specifically includes the following steps:

[0034] (1) Place shaped graphite (1600g) with a D50 average particle size of 17μm in a chemical vapor deposition furnace, pump it to a vacuum state, fill it with nitrogen at a rate of 12L / h, and raise the temperature to 420°C at a rate of 8°C / min. After reaching 420°C, fill in silane at a rate of 25L / h, keep the temperature for 2 hours, close the silicon source gas pipeline, enter the automatic cooling program, and take it out after cooling down to normal temperature to obtain shaped graphite with deposited nano-silicon;

[0035] (2) Combine 900g of shaped graphite deposited with silicon, and 100g of mesophase pitch, with an average particle size of D50 of 10.27μm, a rotation speed of 900r / min, and a stirring time of 20min. With circulating water to stabilize

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Abstract

The invention discloses a preparation method of a double-particle-size pitch repeatedly-coated shaped graphite silicon-carbon negative electrode material, which comprises the following steps: performing CVD vapor deposition on nano silicon on shaped graphite, then coating an outer-layer carbon source with a layer of thickness-controllable mesophase carbon through a thermal polycondensation reaction of pitch, and performing double-layer pitch coating, so that better coating can be realized, the nano silicon is prevented from being exposed and being in direct contact with electrolyte, the technical problems in the prior art are thoroughly solved, and the obtained composite silicon-carbon material is high in first efficiency, good in cycle performance and good in rate capability; and according to the mechanism, the silicon carbon material coated with the asphalt with different particle sizes for multiple times is good in coating layer binding property, good in coating effect, uniform, stable and good in conductivity after carbonization, migration of lithium ions is facilitated, the high-rate discharge capacity is improved, and the cycle performance is remarkably improved.

Description

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Claims

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Application Information

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Owner 浙江锂宸新材料科技有限公司
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