Pomegranate-like Ti-doped LiNi0.4Mn1.6O4 5 V-class cathode with superior high-voltage cycle and rate performance for Li-ion batteries

The high-voltage and low-cost lithium nickel manganese oxides are regarded as the most potential cathode materials for high-density Li-ion batteries (LIBs), but the inferior ionic conductivity and vulnerable lattice oxygen limit their rate and cycle capabilities. Herein, we report a unique pomegranate-like Ti-doped LiNi0.4Mn1.6O4 cathode materials (LNMTO) without surface residues, which are expected to greatly shorten the Li+ transfer distance, enhance reaction kinetics and reduce the electrochemical polarization. Meantime, the strong Ti-O bonds can robust the lattice oxygen and stabilize the crystal structure during electrochemical reactions process. Consequently, the LNMTO exhibits a fast charge-discharge capability with a high reversible capacity of 101 mAh g(1) within 3.5-5.0 V even at 10C with an 84.4% capacity retention after 500 cycles at 1C, which is superior to the reported LiNi0.4Mn1.6O4-related cathode materials. This work provides a novel inspiration to design and synthesize high-voltage cobalt-free based cathode materials with satisfied lithium storage performances. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

A novel Ti-doped LiNi0.4Mn1.6O4 cathode material with a pomegranate-like structure is reported in this study, which can enhance lithium ion transfer rate and reduce electrochemical polarization, leading to improved cycle performance and charge-discharge rate.