Tuning the structural disordering in hierarchical LiNi0.5Mn1.5O4 microrods for stable high-rate electrode performance

High-voltage spinel LiNi0.5Mn1.5O4 (LNMO) is one of the most attractive cathode materials for next -generation Li-ion batteries (LIBs). However, its electrochemical performance depends on its morphology as well as a range of structural parameters. To boost the electrochemical performance of LNMO, here we combine the design of hierarchical microstructure with the control of structural disordering. The hierarchical microrod structure enabled by a simple self-template method guarantees stable capacity retention up to 20 C. Moving forward, the further control of the structural disordering by quenching the microrods at different temperatures leads to an outstanding rate capability. The LNMO microrods quenched at 700 celcius deliver a capacity of 116 mA h g-1 even at a discharging rate of 50 C, and the electrode maintains 80 % of its capacity after 1000 cycles at 5 C. Further experimental study discloses the critical role of the structural disordering over Mn3+ towards the electrochemical performance.(c) 2022 Elsevier B.V. All rights reserved.