Enhancing structural stability unto 4.5 V of Ni-rich cathodes by tungsten-doping for lithium storage

• Published in: Journal of power sources Vol. 423; pp. 246 - 254
• Main Authors: Shang, Guozhi, Tang, Yiwei, Lai, Yanqing, Wu, Jian, Yang, Xing, Li, Huangxu, Peng, Can, Zheng, Jiangfeng, Zhang, Zhian
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 31.05.2019
• Subjects: High voltage; Lithium-ion batteries; Nickel-rich cathodes materials; Structural stability; W-modification; Lithium-ion batteries; W-modification; High voltage; Structural stability; Nickel-rich cathodes materials
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2019.03.072

Nickel-rich cathode material LiNi0.8Co0.1Mn0.1O2 has received widespread attention as the promising material for high energy density lithium-ion batteries. However, there still remains some formidable challenges for commercial application, of which the high-voltage cycling stability must be paid broad concerns because of the huge gap between the actual and ideal performance. Herein, a series of tungsten-doped LiNi0.8Co0.1Mn0.1O2 with enhanced capacity by pushing the cut-off potential to a high level (4.5 V) are investigated. It is found that the 0.5 mol% WO3 modified LiNi0.8Co0.1Mn0.1O2 (WNCM-0.5) displays optimal performance with an initial discharge capacity of 203.6 mAhg−1, which is almost close to that of pristine LiNi0.8Mn0.1Co0.1O2 (205.9 mAhg−1) at 0.2C (1C = 200 mAhg−1), within the potential range of 2.8–4.5 V. Moreover, the capacity loss for WNCM-0.5 is 7.9% after testing for 100 cycles at 1C, much less than that of the pristine cathodes (15%). Improved electrochemical performance could be ascribed to the obstruction of impendence increase and discharge voltage decline, as well as suppression of structure collapse upon cycling. •A series of W-doped NCM811 cathode materials were prepared.•The modified NCM811 exhibits better stability and structural integrity.•WNCM-0.5 displays best rate and cycling performance at elevated cut-off voltage.•This work has extremely high commercial competitiveness and viability.