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

Abstract

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.