摘要
LiNi0.8Co0.1Mn0.1O2是一种具有高能量密度的锂离子电池正极材料,但实际应用中的循环性能不佳、热稳定性差等缺陷亟待改善。本研究通过高温固相反应法制备了LiNi0.8-Co0.1Mn0.1O2材料,并采用H3BO3对其进行包覆改性。扫描电镜(SEM)显示包覆热处理后正极材料表面形成了一层不均匀絮状包覆物,X射线光电子能谱(XPS)测试显示该包覆物为LiBO2和Li2B4O7的混合物。电化学测试表明包覆物有效减缓了循环过程中的阻抗增加,显著提升了正极材料的容量与循环性能,其中0.5%包覆的正极材料0.2 C首次放电容量达到195.9 mAh·g^-1,1 C循环100周后容量保持率达到88.7%。
As one of Li-ion battery cathode,LiNi0.8Co0.1Mn0.1O2 has high power density,but poor cycling and thermal performance.In this study,it was prepared by high temperature solid reaction,then coated with H3BO3.Inhomogeneous layer on the surface of LiNi0.8Co0.1-Mn0.1O2,can be seen under SEM,and characterized to be a mixture of LiBO2 and Li2B4O7 by XPS.Through electrochemical test,this layer can lower the impedance increasement efficiently through cycling procedure,and contribute to the capacity and cycling performance remarkably.Especially,LiNi0.8Co0.1Mn0.1O2,coated with 0.5%H3BO3,has 195.9 mAh·g-1of capacity under 0.2 C circumstance,and 88.7%of capacity retention after 100 cycles under 1 C circumstance.
作者
陈明峰
袁徐俊
佘圣贤
黄晓笑
CHEN Mingfeng;YUAN Xujun;SHE Shengxian;HUANG Xiaoxiao(Research Department of Battery Material,Ningbo Ronbay New Energy Technology Co.,Ltd.,Yuyao 315400,China)
出处
《青岛科技大学学报（自然科学版）》
CAS
2020年第5期41-46,共6页
Journal of Qingdao University of Science and Technology:Natural Science Edition
基金
科技创新2025重大专项项目(2019B10113).
