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Co-modification of conductive graphite and Zr doping to enhance the Li-storage properties of Ni-rich binary cathode material

Co-modification of conductive graphite and Zr doping to enhance the Li-storage properties of... Ni-rich binary cathode materials have attracted much attention due to their high specific capacity, good performance-cost ratio, and environmental friendliness. However, their commercial application is limited by the problems of rapid capacity attenuation and poor cycling performance at high voltage. In this work, Zr and conductive ks-6 co-modified LiNi0.85Mn0.15O2 cathode materials are successfully synthesized through optimizing the proportion of modified components. The results show that the discharge capacity of LiNi0.85Mn0.15O2 co-modified with Zr and 2 wt% ks-6 (NMZ-2) increases from 182.71 mAh g−1 to 203.32 mAh g−1, and the capacity retention rate rises from 67.59 to 81.09% after 100 cycles at 1 C between 2.75 V and 4.35 V. The excellent Li-storage performance may be attributed to the synergistic effect of conductive ks-6 and Zr doping, which not only increases the electronic conductivity and reduces the electrode polarization, but also significantly reduces the cation mixing and inhibits the irreversible phase transition during cycling. The co-modified LiNi0.85Mn0.15O2 cathode material shows higher Ni3+ content and layer structure integrity, which enhance the reversibility and cycling stability of the electrode during cycling. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ionics Springer Journals

Co-modification of conductive graphite and Zr doping to enhance the Li-storage properties of Ni-rich binary cathode material

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References (52)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021
ISSN
0947-7047
eISSN
1862-0760
DOI
10.1007/s11581-021-04369-3
Publisher site
See Article on Publisher Site

Abstract

Ni-rich binary cathode materials have attracted much attention due to their high specific capacity, good performance-cost ratio, and environmental friendliness. However, their commercial application is limited by the problems of rapid capacity attenuation and poor cycling performance at high voltage. In this work, Zr and conductive ks-6 co-modified LiNi0.85Mn0.15O2 cathode materials are successfully synthesized through optimizing the proportion of modified components. The results show that the discharge capacity of LiNi0.85Mn0.15O2 co-modified with Zr and 2 wt% ks-6 (NMZ-2) increases from 182.71 mAh g−1 to 203.32 mAh g−1, and the capacity retention rate rises from 67.59 to 81.09% after 100 cycles at 1 C between 2.75 V and 4.35 V. The excellent Li-storage performance may be attributed to the synergistic effect of conductive ks-6 and Zr doping, which not only increases the electronic conductivity and reduces the electrode polarization, but also significantly reduces the cation mixing and inhibits the irreversible phase transition during cycling. The co-modified LiNi0.85Mn0.15O2 cathode material shows higher Ni3+ content and layer structure integrity, which enhance the reversibility and cycling stability of the electrode during cycling.

Journal

Ionics – Springer Journals

Published: Mar 1, 2022

Keywords: LiNi0.85Mn0.15O2; Ni-rich; Conductive graphite; Co-modification; Lithium-ion batteries

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