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High-first-effect silicon-carbon negative electrode material, preparation method thereof and lithium ion battery
The invention discloses a high-first-effect silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery and relates to the technical field of lithium-ion batteries. The preparation method of the silicon-carbon negative electrode material comprises the steps: S1, preparing material, S2, performing mixing; and S3, performing sintering. The S1 of material preparation comprises: S1.1, performing silicon material preparation; and S1.2, performing carbon material preparation; the specific preparation process of the silicon material at the S1.1 is as follows: silicon powder, silicon monoxide powder and a reducing agent are mixed, sanded and dried to obtain a silicon material, wherein the silicon powder accounts for 20-50 wt% of the total mass of the siliconpowder and the silicon monoxide powder; and the reducing agent is a water-soluble organic matter and accounts for 10-20 wt% of the total mass of the silicon powder and the silicon monoxide powder. The reducing agent plays a role in inhibiting the generation of silicon dioxide to improve the initial charge-discharge efficiency of the negative electrode material; the reducing agent can also be usedas a part of a carbon source for coating in the S3 of sintering process to improve the electrochemical performance with certain advantages; and the agent can react with the surface of silicon to reduce the specific surface area of silicon, thereby improving the initial effect.
本发明公开了一种高首效硅碳负极材料及其制备方法、锂离子电池，涉及锂离子电池技术领域，硅碳负极材料的制备方法包括步骤S1备料、S2混合、S3烧结，所述S1备料包括S1.1硅料制备和S1.2碳料制备，所述S1.1硅料制备的具体过程如下：将硅粉、氧化亚硅粉和还原剂混合，并进行砂磨、烘干，得到硅料，所述硅粉占硅粉和氧化亚硅粉总质量20‑50wt%，所述还原剂为水溶性有机物且占硅粉和氧化亚硅粉总质量的10‑20wt%。还原剂起到抑制二氧化硅生成的作用，提高负极材料的首次充放电效率，且还原剂在S3烧结过程中也可作为碳源的一部分进行包覆，提高一定优势的电化学性能，且会和硅表面反应，减小硅的比表面积，从而提高首效。
High-first-effect silicon-carbon negative electrode material, preparation method thereof and lithium ion battery
The invention discloses a high-first-effect silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery and relates to the technical field of lithium-ion batteries. The preparation method of the silicon-carbon negative electrode material comprises the steps: S1, preparing material, S2, performing mixing; and S3, performing sintering. The S1 of material preparation comprises: S1.1, performing silicon material preparation; and S1.2, performing carbon material preparation; the specific preparation process of the silicon material at the S1.1 is as follows: silicon powder, silicon monoxide powder and a reducing agent are mixed, sanded and dried to obtain a silicon material, wherein the silicon powder accounts for 20-50 wt% of the total mass of the siliconpowder and the silicon monoxide powder; and the reducing agent is a water-soluble organic matter and accounts for 10-20 wt% of the total mass of the silicon powder and the silicon monoxide powder. The reducing agent plays a role in inhibiting the generation of silicon dioxide to improve the initial charge-discharge efficiency of the negative electrode material; the reducing agent can also be usedas a part of a carbon source for coating in the S3 of sintering process to improve the electrochemical performance with certain advantages; and the agent can react with the surface of silicon to reduce the specific surface area of silicon, thereby improving the initial effect.
本发明公开了一种高首效硅碳负极材料及其制备方法、锂离子电池，涉及锂离子电池技术领域，硅碳负极材料的制备方法包括步骤S1备料、S2混合、S3烧结，所述S1备料包括S1.1硅料制备和S1.2碳料制备，所述S1.1硅料制备的具体过程如下：将硅粉、氧化亚硅粉和还原剂混合，并进行砂磨、烘干，得到硅料，所述硅粉占硅粉和氧化亚硅粉总质量20‑50wt%，所述还原剂为水溶性有机物且占硅粉和氧化亚硅粉总质量的10‑20wt%。还原剂起到抑制二氧化硅生成的作用，提高负极材料的首次充放电效率，且还原剂在S3烧结过程中也可作为碳源的一部分进行包覆，提高一定优势的电化学性能，且会和硅表面反应，减小硅的比表面积，从而提高首效。
High-first-effect silicon-carbon negative electrode material, preparation method thereof and lithium ion battery
一种高首效硅碳负极材料及其制备方法、锂离子电池
SUN YUXING (author) / WU QINGGUO (author)
2020-09-08
Patent
Electronic Resource
Chinese
| European Patent Office | 2021
| European Patent Office | 2020
Lithium battery negative electrode material and preparation method thereof
| European Patent Office | 2021
Lithium ion battery negative electrode material and preparation method thereof
| European Patent Office | 2020
| European Patent Office | 2021