Journal
NANOTECHNOLOGY
Volume 31, Issue 45, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab9579
Keywords
co-free; li-rich layered oxide materials; co-doping; synergistic effect
Funding
- National Natural Science Foundation of China [21878195, 21805018, 21805198]
- Sichuan University [2019CDLZ]
- Luzhou Municipal People's Government [2019CDLZ-06]
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There has been extensive research into lithium-rich layered oxide materials as candidates for the nextgeneration of cathode materials in lithium-ion batteries, due to their high energy density and low cost; however, their poor cycle life and fast voltage fade hinder their large-scale commercial application. Here, we propose a novel cation/anion (Na+/PO43-) co-doping approach to mitigate the discharge capacity and voltage fade of a Co-free Li(1.2)Ni(0.2)Mn(0.6)O(2)cathode. Our results show that the synergistic effect of cation/anion doping can promote long cycle stability and rate performance by inhibiting the phase transformation of the layered structure to a spinel or rock-salt structure and stabilizing the well-ordered crystal structure during long cycles. The co-doped sample exhibits an outstanding cycle stability (capacity retention of 86.7% after 150 cycles at 1 C) and excellent rate performance (153 mAh g(-1)at 5 C). The large ionic radius of Na(+)can expand the Li slab to accelerate Li diffusion and the large tetrahedral PO(4)(3-)polyanions with high electronegativity stabilize the local structure to improve the electrochemical performance.
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