Synergistic effect of B-Nb co-modified to achieve crystal structure and interface tuning for Ni-rich cathode

被引:1
作者
Wang, Zhaokun [1 ]
Wang, Jiashuai [1 ]
Shi, Haofeng [1 ]
Wang, Chengdeng [1 ]
Li, Wenxin [2 ]
Wang, Zhi [1 ]
Zhang, Wenyuan [1 ]
Xiong, Zhihao [1 ]
Gao, Yan [3 ]
Yan, Xiaoqin [1 ,4 ]
机构
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Beijing Inst Technol, Sch Future Technol, Beijing 100081, Peoples R China
[3] Natl Ctr Nanosci & Technol, Lab Nanosyst & Hierarchy Fabricat, Beijing 100190, Peoples R China
[4] Univ Sci & Technol Beijing, Beijing Municipal Key Lab New Energy Mat & Technol, Beijing 100083, Peoples R China
关键词
Ni-rich layered cathodes; Crystal orientation engineering; Side reactions; Cyclic stability; LITHIUM; PERFORMANCE; CAPACITY; VOLTAGE;
D O I
10.1016/j.electacta.2023.143475
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Nickel-rich cathode materials play a pivotal role in the functioning of lithium-ion batteries, but their crystal structure defects and surface side reactions significantly affect battery performance. This has slowed down the commercialization process of nickel-rich cathodes. To remedy these problems, a new strategy utilizing B and Nb for crystal structure and interface control of LiNi0.8Co0.1Mn0.1O2 (NCM811) is proposed in this study. The B-Nb modified cathode exhibits strong radial orientation and exposes a large number of active (003) lattice plane on the particle surface. This structural control reduces micro-cracks and accelerates lithium-ion diffusion kinetics. Additionally, the LiNbO3 coating effectively avoids immediate contact between secondary particles and the electrolyte, greatly alleviating side reactions. Consequently, the optimal cathode B-NCM@LNO5 modified cathode maintains a capacity retention of 86.71% after 200 cycles at 1 C, outperforming the original material (76.11% retention). Meanwhile, it demonstrates attractive rate capability of 158.4 mAhg(-1) under 5 C. This research provides valuable insights for addressing anisotropic strain and interface compatibility issues in nickel-rich cathodes.
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页数:8
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