Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 182, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2023.111603
Keywords
Polypyrrole; Li3V2(PO4)(3); Lithium-ion storage; Zr4+ doping; Rate property
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In this research, a promising strategy of polypyrrole coating and Zr4+ doping was introduced to improve the conductivity of LVP material. The Zr4+-doped and polypyrrole-coated LVZ(x)P@PPy electrode was synthesized by a facile way followed by an in-situ pyrrole polymerization procedure. The as-fabricated electrode exhibited outstanding rate property for lithium energy storage.
The inferior electrical conductivity seriously prevents the application of monoclinic Li3V2(PO4)(3) (LVP) cathode in lithium energy storage. In this research, we introduce a promising strategy of polypyrrole coating and Zr4+ doping to promote the conductivity of LVP material. The Zr4+-doped and polypyrrole-coated LVP (LVZ(x)P@PPy) electrode is synthesized by a facile way followed by an in-situ pyrrole polymerization procedure for the first time. The substitution of Zr4+ in V3+ site can enlarge the lattice volume of LVP, providing a big diffusion channel for Li+ extraction and insertion. Besides, Zr4+ doping can also promote the intrinsic conductivity of LVP, whilst polypyrrole film can greatly promote the apparent conductivity. Therefore, the as-fabricated LVZ(x)P@PPy electrode possesses outstanding rate property for lithium energy storage. Especially, LVZ(5%)P@PPy displays the specific capacities of 131.5 and 115.2 mA h g(-1) at 0.1 and 5C respectively between 3 and 4.3 V. Meanwhile, it shows the high capacity retention of 95.7% over 400 cycles at 10C in the potential range of 3 similar to 4.8 V.
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