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submitted on 10.09.2019 and posted on 11.09.2019by Panpan Wang, Yue Du, Baoyou Zhang, Yanxin Yao, Yuchen Xiao, Lijie Ci, Chengyan Xu, Liang Zhen
The β-phase lithium vanadium oxide bronze (β-LixV2O5)
with high theoretic specific capacity up to 440 mAh g-1 is
considered as promising cathode materials, however, their practical application
is hindered by its poor ionic and electronic conductivity, resulting in unsatisfied
cyclic stability and rate capability. Herein, we report the surface decoration
of β-LixV2O5 cathode using both reduced
oxide graphene and ionic conductor LaPO4, which significantly promotes the electronic transfer and Li+
diffusion rate, respectively. As a result, the rGO/LaPO4/LixV2O5
composite exhibits excellent electrochemical performance in terms of high reversible
specific capacity of 275.7 mAh g-1 with high capacity retention of
84.1% after 100 cycles at a current density of 60 mA g-1, and
acceptable specific capacity of 170.3 mAh g-1 at high current
density of 400 mA g-1. The cycled electrode is also analyzed by
electrochemical impedance spectroscopy, ex-situ
X-ray diffraction and scanning electron microscope, providing further
insights into the improvement of electrochemical performance. Our results
provide an effective approach to boost the electrochemical properties of
lithium vanadates for practical application in lithium ion batteries.