Issue 20, 2022

N-doped engineering of a high-voltage LiNi0.5Mn1.5O4 cathode with superior cycling capability for wide temperature lithium–ion batteries

Abstract

Spinel LiNi0.5Mn1.5O4 (LNMO) is one potential cathode candidate for next-generation high energy-density lithium–ion batteries (LIBs). However, serious capacity decay from its poor structural stability, especially at high operating temperatures, shadows its application prospects. In this work, N-doped LNMO (LNMON) was synthesized by a facile co-precipitation method and multistep calcination, exhibiting a unique yolk–shell architecture. Concurrently, N dopants are introduced into a LNMO lattice, endowing LNMON with a more stable structure via stronger Ni–N/Mn–N bindings. Benefiting from the synergistic effect of the yolk–shell structure and N-doped engineering, the obtained LNMON cathode exhibits an impressive rate and the state-of-the-art cycling capability, delivering a high capacity of 103 mA h g−1 at 25 °C after 8000 cycles. Even at a high operating temperature of 60 °C, the capacity retention remains at 92% after 1000 cycles. The discovery of N dopants in improving the cycling capability of LNMO in our case offers a prospective approach to enable 5 V LNMO cathode materials with excellent cycling capability.

Graphical abstract: N-doped engineering of a high-voltage LiNi0.5Mn1.5O4 cathode with superior cycling capability for wide temperature lithium–ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
19 Feb 2022
Accepted
24 Mar 2022
First published
30 Mar 2022

Phys. Chem. Chem. Phys., 2022,24, 12214-12225

N-doped engineering of a high-voltage LiNi0.5Mn1.5O4 cathode with superior cycling capability for wide temperature lithium–ion batteries

M. Li, Q. Li, M. Hu, Y. Du, Z. Duan, H. Fan, Y. Cui, S. Liu, Y. Jin and W. Liu, Phys. Chem. Chem. Phys., 2022, 24, 12214 DOI: 10.1039/D2CP00835A

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