Study on the surface modification of spinel LiNi0.45Cr0.1Mn1.45O4

A amorphous compound Li–Al–Ti–O is coated on the surface of spinel LiNi0.45Cr0.1Mn1.45O4. Different from other coatings, the coating layer and the bulk material are not simply connected. There is a transition region between the coating layer and the bulk material, in which no sudden change of lattic...

Full description

Saved in:
Bibliographic Details
Published in:Journal of alloys and compounds 2020-04, Vol.821, p.153418, Article 153418
Main Authors: Liu, Guoqiang, Sun, Lizhu, Tong, Zizheng, Liu, Ru-Shi, Wang, Bao, Xia, Xinde
Format: Article
Language:English
Subjects:
Bonding strength
Charge-discharge properties
Diffusion coating
Diffusion coefficient
Impedance measurement
Lattice matching
Lithium
Lithium ions
Spinel
Spinel LiNi0.45Cr0.1Mn1.45O4
Structure characteristics
Surface modification
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A amorphous compound Li–Al–Ti–O is coated on the surface of spinel LiNi0.45Cr0.1Mn1.45O4. Different from other coatings, the coating layer and the bulk material are not simply connected. There is a transition region between the coating layer and the bulk material, in which no sudden change of lattice emerges. High-resolution transmission electron microscopy (HRTEM) shows that lattice matching is formed at the contact region between coating layer and bulk material. The Cr K-edge XANES spectra show that the local structure of Cr has not changed before and after coating. According to the electrochemical impedance measurement, the diffusion coefficient of lithium ion has no much changes after coating. Compared with the pristine materials, this coated materials exhibits improved cycle performance. After 700 charging and discharging cycles, the capacity retention rate reaches over 83%, and the Coulomb efficiency of each cycle is 99.5%. This coating structure undoubtedly increases the bonding strength between the coating layer and the bulk material, and also reduces the resistance of lithium ions passing through transition region. This coating lays a good foundation for the practical application of the spinel LiNi0.45Cr0.1Mn1.45O4. •A new amorphous compound Li–Al–Ti–O was coated on the spinel LiNi0.45Cr0.1Mn1.45O4.•The structural characteristics of coating were in-depth studied.•The coated material exhibited superior cycle performance.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.153418