Nickel-rich layered cathode LiNi0.8Co0.1Mn0.1O2 mediated by a selective lattice doping towards high-performance lithium ion battery

• Published in: Journal of alloys and compounds 2023-09, Vol.957, p.170400, Article 170400
• Main Authors: Zhang, Jue, Cao, Tangzhe, Lei, Ying, Li, Jianying, Fan, Weifeng, Zhang, Bin, Liu, Xingyong, Si, Yujun, Wang, Honghui
• Format: Article
• Language: English
• Subjects: Lithium-ion battery; Nickel-rich layered cathode; Selective lattice doping; Synergistic effect; Tuned phase transition
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.170400

Rapid capacity loss and voltage fading pose a significant barrier to the commercialization of nickel-rich materials with layered structures due to particle cracking and structure degradation. Double element selective lattice modification strategy that can balance multiple performance requirements is gaining attention. Here, we proposed a selective lattice doping strategy to enhance the lattice stability of LiNi0.8Co0.1Mn0.1O2 via a double element co-doping of Mg and W. Impressively, the Mg/W co-doping improved electrochemical reaction kinetics and discharge capacity, and largely suppressed structure degradation simultaneously. In situ X-ray diffraction (XRD) results demonstrated that W/Mg co-doping can tune H2−H3 phase transition, relieving the lattice stress and mechanical degradation. These improvements can be attributed to a synergistic effect of W and Mg, in which high valence state W6+ induced the formation of Ni2+ and strong W−O bonds increased layer structure stability, meanwhile Mg2+ as a pillar inhibited Li+/Ni2+ mixing and maintained structural stability. This work provides selective lattice dual-doping strategic guidelines for the use of high energy efficiency and robust stability high-nickel low-cobalt cathodes in lithium-ion batteries. •Mg/W-NCM cathodes exhibited improved initial capacity and the higher capacity retention of 86 % after 300 cycles at 1 C.•Mg/W dual doping can relieve the lattice distortion through suppressing the undesired H2−H3 phase transition.•The superior performance is attributed to the synergistic effect of Mg2+ pillar effect and the rivet effect of W−O bonds.