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Silicon-carbon composite negative electrode material for lithium ion battery, preparation method of silicon-carbon composite negative electrode material and battery
The invention discloses a silicon-carbon composite negative electrode material for a lithium ion battery, a preparation method of the silicon-carbon composite negative electrode material and the battery. According to the preparation method of the silicon-carbon composite negative electrode material for the lithium ion battery, the silicon surface is coated with a foaming agent, an organic polymer and asphalt through a solid-phase reaction method to prepare the silicon-carbon composite negative electrode material for the lithium ion battery. The silicon-carbon composite negative electrode material for the lithium ion battery is of a core-shell structure, the core-shell structure comprises a Si/C inner core and a carbon coating layer coating the surface of the Si/C inner core, the Si/C inner core is an inner core with Si distributed on the surface of graphite, and a cavity is formed between the Si/C inner core and the carbon coating layer. The preparation method is simple and convenient in process, environment-friendly, pollution-free and easy to realize large-scale production, and the prepared silicon-carbon composite negative electrode material for the lithium ion battery has enough volume expansion cavities, so that the volume expansion of silicon can be relieved, the conductivity of the negative electrode material is effectively improved, and the electrochemical performance of the lithium ion battery is further improved.
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、电池，其中锂离子电池用硅碳复合负极材料的制备方法通过固相反应法将发泡剂、有机高分子以及沥青包覆在硅表面制得锂离子电池用硅碳复合负极材料；锂离子电池用硅碳复合负极材料为核壳结构，核壳结构包括Si/C内核以及包覆在Si/C内核表面的碳包覆层，Si/C内核为石墨表面分布有Si的内核，Si/C内核与碳包覆层之间具有空腔。该制备方法不仅工艺简便、环境友好无污染、容易实现规模化生产，而且其制备的锂离子电池用硅碳复合负极材料具有足够的体积膨胀空腔，能够缓解硅的体积膨胀，有效提高负极材料的导电性，进而改善锂离子电池的电化学性能。
Silicon-carbon composite negative electrode material for lithium ion battery, preparation method of silicon-carbon composite negative electrode material and battery
The invention discloses a silicon-carbon composite negative electrode material for a lithium ion battery, a preparation method of the silicon-carbon composite negative electrode material and the battery. According to the preparation method of the silicon-carbon composite negative electrode material for the lithium ion battery, the silicon surface is coated with a foaming agent, an organic polymer and asphalt through a solid-phase reaction method to prepare the silicon-carbon composite negative electrode material for the lithium ion battery. The silicon-carbon composite negative electrode material for the lithium ion battery is of a core-shell structure, the core-shell structure comprises a Si/C inner core and a carbon coating layer coating the surface of the Si/C inner core, the Si/C inner core is an inner core with Si distributed on the surface of graphite, and a cavity is formed between the Si/C inner core and the carbon coating layer. The preparation method is simple and convenient in process, environment-friendly, pollution-free and easy to realize large-scale production, and the prepared silicon-carbon composite negative electrode material for the lithium ion battery has enough volume expansion cavities, so that the volume expansion of silicon can be relieved, the conductivity of the negative electrode material is effectively improved, and the electrochemical performance of the lithium ion battery is further improved.
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、电池，其中锂离子电池用硅碳复合负极材料的制备方法通过固相反应法将发泡剂、有机高分子以及沥青包覆在硅表面制得锂离子电池用硅碳复合负极材料；锂离子电池用硅碳复合负极材料为核壳结构，核壳结构包括Si/C内核以及包覆在Si/C内核表面的碳包覆层，Si/C内核为石墨表面分布有Si的内核，Si/C内核与碳包覆层之间具有空腔。该制备方法不仅工艺简便、环境友好无污染、容易实现规模化生产，而且其制备的锂离子电池用硅碳复合负极材料具有足够的体积膨胀空腔，能够缓解硅的体积膨胀，有效提高负极材料的导电性，进而改善锂离子电池的电化学性能。
Silicon-carbon composite negative electrode material for lithium ion battery, preparation method of silicon-carbon composite negative electrode material and battery
锂离子电池用硅碳复合负极材料及其制备方法、电池
TAN YINGBIN (author) / LI ZHENGZHENG (author) / WU RUOFEI (author) / TAO JUN (author) / YANG BING (author)
2021-12-28
Patent
Electronic Resource
Chinese
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