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Title: Crystal Chemistry of Electrochemically and Chemically Lithiated Layered αI-LiVOPO4

Journal Article · · Chemistry of Materials
 [1];  [2];  [1]
  1. Univ. of Texas, Austin, TX (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

LiVOPO4 is an attractive cathode for lithium-ion batteries with a high operating voltage and the potential to achieve the reversible insertion of two lithium ions between VOPO4 and Li2VOPO4. Among the three known forms of LiVOPO4 (α, β, and αI), the αI-LiVOPO4 has a layered structure that could promote better ionic mobility and reversibility than others. However, a comprehensive study of its lithiated product is not available as αI-LiVOPO4 is metastable and difficult to prepare by conventional approaches. We present here a facile synthesis of highly crystalline αI-LiVOPO4 and αI-LiVOPO4/rGO nanocomposite by a microwave-assisted solvothermal method and its electrochemical/chemical lithiation. The LiVOPO4/rGO cathodes exhibit a high reversible capacity of 225 mAh g–1, indicating the insertion of more than one lithium into VOPO4. Both electrochemical and chemical lithiation imply a solid-solution reaction mechanism on inserting the second lithium into αI-LiVOPO4, but a two-phase reaction feature could also occur under certain conditions such as insufficient time for equilibration of Li+ diffusion in the structure. The fully lithiated new αI-Li2VOPO4 phase was characterized by combined Rietveld refinement of neutron diffraction and X-ray diffraction data and by bond-valence sum maps. The results suggest that αI-Li2VOPO4 retains the tetragonal P4/nmm symmetry of the parent αI-LiVOPO4 structure, where the second lithium ions are located in the lithium layers rather than in the VOPO4 layers

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265668
Journal Information:
Chemistry of Materials, Vol. 27, Issue 19; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Competing with other polyanionic cathode materials for potassium-ion batteries via fine structure design: new layered KVOPO 4 with a tailored particle morphology journal January 2019
Research Progress in Multielectron Reactions in Polyanionic Materials for Sodium‐Ion Batteries journal October 2018
Delithiation/lithiation behaviors of three polymorphs of LiVOPO 4 journal January 2018
Evaluation of α 1 -LiVOPO 4 , β-LiVOPO 4 , and α-LiVOPO 4 Synthesized from a Same Precursor by Hydrothermal Method journal January 2019
Voltage issue of aqueous rechargeable metal-ion batteries journal January 2020
Aqueous rechargeable zinc/sodium vanadate batteries with enhanced performance from simultaneous insertion of dual carriers journal April 2018
Role of disorder in limiting the true multi-electron redox in ε-LiVOPO 4 journal January 2018
In situ carbon coated flower-like VPO 4 as an anode material for potassium-ion batteries journal January 2019
Rational synthesis and electrochemical performance of LiVOPO 4 polymorphs journal January 2019
High-voltage positive electrode materials for lithium-ion batteries journal January 2017
Microwave-assisted chemical insertion: a rapid technique for screening cathodes for Mg-ion batteries journal January 2017