Negative electrode composite material and preparation method thereof, negative electrode plate and secondary battery

• Main Authors: YANG SHAN, CHEN JIE, MO ZILIN, XIANG HAIBIAO, LI ZAIBO
• Format: Patent
• Language: Chinese; English
• Published: 25.03.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention belongs to the technical field of secondary batteries, and particularly relates to a negative electrode composite material and a preparation method thereof, a negative electrode plate and a secondary battery, and the negative electrode composite material comprises carbon spheres and titanium dioxide and nitrogen coating the surfaces of the carbon spheres. According to the negative electrode composite material disclosed by the invention, titanium dioxide can improve a charge-discharge platform, increase the structural stability of the material, reduce a lithium dendrite phenomenon and improve safety, and nitrogen is doped, so that the conductivity and stability of the material are improved, and the discharge performance and cycle performance of a lithium ion battery are greatly improved. 本发明属于二次电池技术领域，尤其涉及一种负极复合材料及其制备方法、负极片以及二次电池，包括碳球和包覆在所述碳球表面的二氧化钛和氮。本发明的一种负极复合材料，二氧化钛能够提高充放电平台，增加材料结构稳定性，减少锂枝晶现象，提高安全问题，而且掺杂了氮元素，提升材料导电能力和稳定性，极大提高锂离子电池的放电性能及循环性能。