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Carbon-silicon composite material, preparation method thereof, and lithium ion battery containing carbon-silicon composite material

A composite material, carbon-silicon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as volume effect and capacity fading that cannot be fundamentally suppressed, and achieve improved specific capacity and cycle performance, and high lithium storage capacity Characteristics, the effect of high discharge specific capacity

Inactive Publication Date: 2012-07-18
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the above methods alleviate the capacity fading of silicon-based negative electrode materials to a certain extent, the mechanism is simple physical compounding or high-temperature carbon coating, which cannot fundamentally suppress the volume effect in the process of charging and discharging. After cycling, the capacity will start to decay rapidly again

Method used

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  • Carbon-silicon composite material, preparation method thereof, and lithium ion battery containing carbon-silicon composite material
  • Carbon-silicon composite material, preparation method thereof, and lithium ion battery containing carbon-silicon composite material
  • Carbon-silicon composite material, preparation method thereof, and lithium ion battery containing carbon-silicon composite material

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Embodiment 1

[0031] This embodiment provides a method for preparing a carbon-silicon composite material, which includes the following steps:

[0032] (1) Mixing: polyvinyl chloride and silicon powder with a particle size of 1.5 μm are mixed and ball-milled according to a mass ratio of 1:1 to obtain a mixture of polyvinyl chloride and silicon powder;

[0033] (2) Coating: transfer the mixture into a porcelain boat, heat up to 950°C under the protection of argon, keep it warm for 5 hours, take it out after cooling, and obtain a composite material in which the porous carbon layer is tightly coated with silicon;

[0034] (3) Corrosion: Add the composite material of the porous carbon layer tightly coated with silicon into the corrosion solution, the mass ratio of the two is 1:200, and stir continuously for 24 hours, and the composite material of the porous carbon layer tightly coated with silicon Part of the silicon in the carbon is corroded, and the resulting suspension is filtered, fully wash...

Embodiment 2

[0038] This embodiment provides a method for preparing a carbon-silicon composite material, which includes the following steps:

[0039] (1) Mixing: Dissolve phenolic resin in a mixed solvent of ethanol and distilled water to obtain a solution of phenolic resin, add 0.05 μm silicon powder to the solution, the mass ratio of phenolic resin to silicon powder is 1:10, and ultrasonically disperse at 120 Minutes, and then by spray drying to obtain a mixture of phenolic resin and silicon powder, the organic carbon precursor is evenly distributed on the surface of the silicon;

[0040] (2) Coating: Transfer the mixture into a porcelain boat, heat up to 650°C under the protection of nitrogen, keep it warm for 6 hours, take it out after cooling, and obtain a composite material in which the porous carbon layer is tightly coated with silicon;

[0041](3) Corrosion: Add the composite material of the porous carbon layer tightly coated with silicon into the etching solution, the mass ratio o...

Embodiment 3

[0044] This embodiment provides a method for preparing a carbon-silicon composite material, which includes the following steps:

[0045] (1) Mixing: the styrene-butadiene rubber latex and the silicon powder whose particle size is 2.5 μm are mixed and ground according to the ratio of 4: 1 according to the mass ratio, so as to obtain the mixture of styrene-butadiene rubber latex and silicon powder;

[0046] (2) Coating: Transfer the mixture into a porcelain boat, raise the temperature to 1100°C under the protection of argon and hydrogen mixed gas, keep it warm for 2 hours, take it out after cooling, and obtain a composite of porous carbon layer tightly coated with silicon. Material;

[0047] (3) Corrosion: Add the composite material of the porous carbon layer tightly coated with silicon into the etching solution, the mass ratio of the two is 1:10, and stir continuously for 13 hours, the porous carbon layer tightly coated with silicon composite material Part of the silicon in th...

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Abstract

The invention discloses a carbon-silicon composite material, a preparation method of the carbon-silicon composite material and a lithium ion battery containing the carbon-silicon composite material. The preparation method comprises the steps of: directly selecting silicon powder as a raw material, wrapping the silicon powder with a precursor of organic carbon to obtain a porous carbon layer wrapping silicon composite material, and using corrosive liquid to remove partial silicon in the porous carbon layer wrapping silicon composite material by corrosion, so as to obtain the carbon-silicon composite material, wherein a gap exists between a carbon shell and the silicon arranged in the carbon shell. The preparation process is simple. The carbon-silicon composite material prepared by the preparation method disclosed by the invention is good in electrochemical property, and the battery prepared from the carbon-silicon composite material is good in cycling performance.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a carbon-silicon composite material with high specific capacity, a preparation method thereof, and a lithium ion battery prepared by using the carbon-silicon composite material. Background technique [0002] At present, practical lithium-ion batteries mainly use graphitized carbon as the negative electrode material. The large layered structure of graphite-based negative electrode materials provides a place for lithium storage. The large layered structure determines the low theoretical specific capacity of the material. (about 372mAh / g) characteristics. Therefore, high-capacity and high-rate anode materials have high research and application value. For a long time, silicon-based and tin-based materials have become research hotspots due to their high mass specific capacities (theoretical specific capacities of silicon and tin are 4200mAh / g and 990mAh / g, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/38H01M4/583H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 朱广燕焦方方
Owner CHERY AUTOMOBILE CO LTD
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