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Silicon-carbon composite negative electrode material for lithium ion battery and preparation method thereof
The invention discloses a silicon-carbon composite negative electrode material for a lithium ion battery and a preparation method of the silicon-carbon composite negative electrode material, and aimsto improve the electrochemical performance and safety of the silicon-carbon composite negative electrode material and reduce the cost. The silicon-carbon composite negative electrode material for thelithium ion battery is of a core-shell structure; the core is composed of long-strip-sheet-shaped nanometer silicon powder and micro-powder graphite, amorphous carbon wrapping the surfaces of the nanometer silicon powder and the micro-powder graphite, and amorphous carbon bridged around the wrapped nanometer silicon powder and the micro-powder graphite; and micropores are distributed in the amorphous carbon and in the surface of the amorphous carbon. The shell is a carbon coating layer coating the surface of the core. The preparation method comprises silicon mud coarse powder preparation, acidpickling, nanocrystallization treatment, ultrasonic dispersion, spray granulation, high-temperature fusion and coating and high-temperature calcination. Compared with the prior art, the invention hasthe advantages of high capacity, high-rate charge-discharge performance, the long cycle life and safety, and is excellent in processability, low in production cost, easy to control and suitable for large-scale industrial production.
本发明公开了一种锂离子电池用硅碳复合负极材料及其制备方法，要解决的技术问题是提高硅碳复合负极材料的电化学性能和安全性，降低成本。本发明的锂离子电池用硅碳复合负极材料，为核壳结构；核由长条薄片状的纳米硅粉和微粉石墨、包覆在纳米硅粉和微粉石墨表面的无定形碳、桥接在包覆后的纳米硅粉和微粉石墨周围的无定形碳组成，无定形碳内部和表面分布有微小孔隙；壳为包覆在核表面的碳包覆层。本发明的制备方法，包括硅泥粗粉，酸洗，纳米化处理，超声分散，喷雾造粒，高温融合与包覆，高温煅烧。本发明与现有技术相比，具有高容量、高倍率充放电性能、长循环寿命、安全的特点，加工性能优异，生产成本低，容易控制，适合大规模产业化生产。
Silicon-carbon composite negative electrode material for lithium ion battery and preparation method thereof
The invention discloses a silicon-carbon composite negative electrode material for a lithium ion battery and a preparation method of the silicon-carbon composite negative electrode material, and aimsto improve the electrochemical performance and safety of the silicon-carbon composite negative electrode material and reduce the cost. The silicon-carbon composite negative electrode material for thelithium ion battery is of a core-shell structure; the core is composed of long-strip-sheet-shaped nanometer silicon powder and micro-powder graphite, amorphous carbon wrapping the surfaces of the nanometer silicon powder and the micro-powder graphite, and amorphous carbon bridged around the wrapped nanometer silicon powder and the micro-powder graphite; and micropores are distributed in the amorphous carbon and in the surface of the amorphous carbon. The shell is a carbon coating layer coating the surface of the core. The preparation method comprises silicon mud coarse powder preparation, acidpickling, nanocrystallization treatment, ultrasonic dispersion, spray granulation, high-temperature fusion and coating and high-temperature calcination. Compared with the prior art, the invention hasthe advantages of high capacity, high-rate charge-discharge performance, the long cycle life and safety, and is excellent in processability, low in production cost, easy to control and suitable for large-scale industrial production.
本发明公开了一种锂离子电池用硅碳复合负极材料及其制备方法，要解决的技术问题是提高硅碳复合负极材料的电化学性能和安全性，降低成本。本发明的锂离子电池用硅碳复合负极材料，为核壳结构；核由长条薄片状的纳米硅粉和微粉石墨、包覆在纳米硅粉和微粉石墨表面的无定形碳、桥接在包覆后的纳米硅粉和微粉石墨周围的无定形碳组成，无定形碳内部和表面分布有微小孔隙；壳为包覆在核表面的碳包覆层。本发明的制备方法，包括硅泥粗粉，酸洗，纳米化处理，超声分散，喷雾造粒，高温融合与包覆，高温煅烧。本发明与现有技术相比，具有高容量、高倍率充放电性能、长循环寿命、安全的特点，加工性能优异，生产成本低，容易控制，适合大规模产业化生产。
Silicon-carbon composite negative electrode material for lithium ion battery and preparation method thereof
锂离子电池用硅碳复合负极材料及其制备方法
WANG XINGWEI (author) / HOU JIAO (author) / HOU CHUNPING (author) / HE CHAO (author) / YANG DAN (author) / MA SHAONING (author)
2020-06-23
Patent
Electronic Resource
Chinese
IPC:
H01M
Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie
,
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
/
B82Y
Bestimmter Gebrauch oder bestimmte Anwendung von Nanostrukturen
,
SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES
/
C01B
NON-METALLIC ELEMENTS
,
Nichtmetallische Elemente
/
C04B
Kalk
,
LIME
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