A method for preparing a silicon-carbon composite material
By preparing nitrogen-doped porous carbon fibers and depositing nano-silicon carbon through electrospinning, the problems of large expansion and poor cycle performance of silicon carbon materials in lithium-ion batteries were solved, and silicon carbon composite materials with high specific capacity, low expansion and excellent cycle performance were realized.
CN116581262BActive Publication Date: 2026-06-12HUIYANG (GUIZHOU) NEW ENERGY MATERIALS CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUIYANG (GUIZHOU) NEW ENERGY MATERIALS CO LTD
- Filing Date
- 2023-05-22
- Publication Date
- 2026-06-12
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Figure CN116581262B_ABST
Abstract
The application discloses a preparation method of a silicon-carbon composite material, which comprises the following steps: dissolving polyacrylonitrile, a nitrogen source, a lithium source and lye in an organic solvent DMF to configure a spinning solution, performing electrostatic spinning to obtain a precursor material, carbonizing and sintering the precursor material in an oxygen atmosphere to obtain porous carbon fibers; transferring the porous carbon fibers into a reaction cavity, heating in a silane mixed gas, keeping the pressure in the cavity at 1-2 Mpa, and keeping the reaction time at 30-300 min to obtain a nano silicon / porous carbon fiber material; transferring the nano silicon / porous carbon fiber material into the reaction cavity, depositing silane, keeping the pressure in the cavity as a micro positive pressure, then depositing a carbon source in a vacuum cavity under a micro negative pressure to obtain a silicon-carbon composite material. The material has the advantages of high specific capacity, high initial efficiency, low expansion, excellent cycle performance and the like when applied to a lithium ion battery.
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