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The multi-cations doped LiVPO4F, nominally Li0.97Cr0.01V0.95Al0.01Nb0.02PO4F0.97, is prepared by Chromium (Cr) doping on lithium site and Al-Nb co-doping on vanadium site via a conventional carbothermal reduction (CTR) route. The crystallographic lattice volume, particle size and morphology are not obviously changed comparing with un-doped LiVPO4F. However, the high rate and lifetime cycling performances are noticeably improved although the capacities at very low currents are slightly decreased. The reversible capacity at 1/10 C, 1 C, 2 C and 4 C of the pristine LiVPO4F is 143 mA h g(-1), 99 mA h g(-1), 86 mA h g(-1) and 70 mA h g(-1), respectively, while that of the doped counterpart is 138 mA h g(-1), 102 mA h g(-1), 95 mA h g(-1) and 82 mA h g(-1), respectively. The capacity retention after 100 galvanostatic cycles at 1.5 C is enhanced from 85.4% to 90.9% by such multi-cations doping. Moreover, the initial coulombic efficiency is significantly increased from 81.8% to 90.3% as well.
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FUNCTIONAL MATERIALS LETTERS
ISSN: 1793-6047
Year: 2015
Issue: 5
Volume: 8
1 . 3 3 3
JCR@2015
2 . 1 7 0
JCR@2020
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:265
JCR Journal Grade:2
CAS Journal Grade:4
Cited Count:
WoS CC Cited Count: 3
SCOPUS Cited Count: 4
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 6