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Lithium-ion battery negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of electrode cycle performance decline, affecting battery stability, agglomeration of negative electrode materials, etc., to achieve good cycle performance, charging Excellent discharge performance and the effect of alleviating volume expansion

Inactive Publication Date: 2013-10-02
天津锦美碳材科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon-based materials have a serious volume effect under the condition of high-level deintercalation of lithium, which causes the destruction of the material structure, which leads to a sharp decline in the cycle performance of the electrode. Repeated charging and discharging of the electrode will cause the agglomeration of the negative electrode material, which will affect the performance of the battery. stability

Method used

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  • Lithium-ion battery negative electrode material and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0018] Pour 30g of polysilazane liquid into a glass container, put it into the constant temperature zone of a high-temperature tube furnace for programmed temperature-controlled cross-linking, increase the temperature to 300°C at a rate of 5°C / min, keep it warm for 2 hours, and then increase the temperature at a rate of 5°C / min The cooling rate was lowered to room temperature to obtain a cross-linked body. Under the protection of Ar, put the cross-linked body in the constant temperature zone of the high-temperature tube furnace for programmed temperature pyrolysis, increase the temperature to 1100 °C at a rate of 5 °C / min, pass ethylene for 20 min, flow 80 sccm and continue to keep warm for 1 h, Ar atmosphere Down to room temperature at a cooling rate of 5°C / min to obtain carbon-coated silicon carbon nitride ceramic powder. The obtained carbon-coated silicon-carbon-nitrogen ceramics are ground and mixed with the graphite negative electrode at a mass ratio of 1:1 to obtain the ...

Embodiment 2

[0020] Pour 30g of polysilazane liquid into a glass container, put it into the constant temperature zone of a high-temperature tube furnace for programmed temperature-controlled cross-linking, increase the temperature to 300°C at a rate of 5°C / min, keep it warm for 2 hours, and then increase the temperature at a rate of 5°C / min The cooling rate was lowered to room temperature to obtain a cross-linked body. Under the protection of Ar, put the cross-linked body in the constant temperature zone of the high-temperature tube furnace for programmed temperature pyrolysis, increase the temperature to 1100 °C at a rate of 5 °C / min, pass ethylene for 20 min, flow 80 sccm and continue to keep warm for 1 h, Ar atmosphere Down to room temperature at a cooling rate of 5°C / min to obtain carbon-coated silicon carbon nitride ceramic powder. Grinding the obtained carbon-coated silicon-carbon-nitrogen ceramics and mixing it with the graphite negative electrode in a mass ratio of 3:1 to obtain th...

Embodiment 3

[0022] Pour 30g of polysilazane liquid into a glass container, put it into the constant temperature zone of a high-temperature tube furnace for programmed temperature-controlled cross-linking, increase the temperature to 300°C at a rate of 5°C / min, keep it warm for 2 hours, and then increase the temperature at a rate of 5°C / min The cooling rate was lowered to room temperature to obtain a cross-linked body. Under the protection of Ar, put the cross-linked body in the constant temperature zone of the high-temperature tube furnace for programmed temperature pyrolysis, increase the temperature to 1100 °C at a rate of 5 °C / min, pass ethylene for 20 min, flow 80 sccm and continue to keep warm for 1 h, Ar atmosphere Down to room temperature at a cooling rate of 5°C / min to obtain carbon-coated silicon carbon nitride ceramic powder. Grinding the obtained carbon-coated silicon-carbon-nitrogen ceramics, and mixing it with the graphite negative electrode at a mass ratio of 5:1 to obtain t...

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Abstract

The invention relates to a lithium-ion battery negative electrode material and a preparation method of the lithium-ion battery negative electrode material. The preparation method comprises the following steps of: preparing a silicon-based precursor ceramic cross-linking body by a precursor method, forming ceramic by pyrolysis; introducing a carbon-containing compound in the pyrolysis process of the cross-linking body; after the carbon-containing compound cracks, forming carbon-containing micromolecules to coat ceramic particles of the precursor; and then mixing the carbon-coated ceramic particles of the precursor and graphite according to the proportion, and obtaining the lithium-ion battery negative material. The lithium-ion battery negative electrode material obtained according to the invention has the advantages that the first-time reversible capacity is 1252mAh / g, the first-time efficiency is 95%, 90% of the capacity can be maintained still after 200-time circulation, and the charging and discharging performances are excellent.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, belonging to the technical field of material preparation. Background technique [0002] With the rapid development of the microelectronics industry and the automobile industry, and the popularization of various portable communication devices, personal computers, and small electronic devices, human requirements for lithium-ion batteries are also moving towards high energy density, high power density, high safety, Development in the direction of long life, fast charging and discharging, and light and thin. At present, the anode materials of commercial lithium-ion batteries mainly use natural graphite and artificial graphite, and their specific capacity is generally 300-360mAh / g. At the same time, the theoretical value of graphite materials is 372mAh / g, and the development potential is limited. Therefore, the development of high specific capacity l...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/139H01M4/13C04B35/622
CPCY02E60/10
Inventor 臧文平殷正娥赵旭
Owner 天津锦美碳材科技发展有限公司