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Approaching the Theoretical Capacity of Li 3 VO 4 via Electrochemical Reconstruction
Author(s) -
Ni Shibing,
Zhang Jicheng,
Ma Jianjun,
Yang Xuelin,
Zhang Lulu,
Li Xiaoming,
Zeng Haibo
Publication year - 2016
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201500340
Subject(s) - materials science , electrochemistry , anode , cathode , graphite , carbon fibers , dispersity , current density , conductivity , chemical engineering , nanotechnology , analytical chemistry (journal) , electrode , chemistry , composite material , composite number , organic chemistry , physics , quantum mechanics , polymer chemistry , engineering
Li 3 VO 4 is a potential anode for Li‐ion batteries owing to its safe discharge plateau and high capacity, but the reported reversible capacity is still far from its theoretical value (592 mAh g −1 ). Here, for the first time, a Li 3 VO 4 anode is reported with reversible capacity approaching the theoretical value. Li 3 VO 4 aggregates hybridized with carbon (Li 3 VO 4 /C) are first fabricated, and then dramatically transform into well dispersed Li 3 VO 4 nanocrystals (NCs) anchoring on carbon nanoflakes (NFs) by electrochemical reconstruction. In the Li 3 VO 4 /C NC‐on‐NF structures, the small‐sized Li 3 VO 4 NCs, the flexible carbon NFs, and the good dispersity provide high Li‐ion storage, electronic conductivity and stability, respectively. Resultingly, outstanding electrochemical performance of the Li 3 VO 4 /C is achieved with discharge and charge capacities of 542 and 541 mAh g −1 after 300 cycles at a specific current of 150 mA g −1 . After 1000 cycles at a specific current of 2000 mA g −1 , the discharge and charge capacities are maintained at 422 and 421 mAh g −1 . When matching with a 4 V cathode, the specific energy density of the Li 3 VO 4 /C is 4.2 times of Li 4 Ti 5 O 12 and 1.2 times of graphite, and the volumetric energy density is 3.2 times of Li 4 Ti 5 O 12 and 1.4 times of graphite.