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Title: Synthesis, characterization and electrochemical performance of Al-substituted Li₂MnO₃

Li 2MnO 3 is known to be electrochemically inactive due to Mn in tetravalent oxidation state. Several compositions such as Li 2MnO 3 , Li 1.5Al 0.17MnO 3, Li 1.0Al 0.33MnO 3 and Li 0.5Al 0.5MnO 3 were synthesized by a sol–gel Pechini method. All the samples were characterized with x-ray diffraction, Raman, x-ray photoelectron spectroscopy, scanning electron microscopy, Tap density and BET analyzer. X-ray diffraction patterns indicated the presence of monoclinic phase for pristine Li 2MnO 3and mixed monoclinic/spinel phases (Li 2 - xMn 1 - yAl x + yO 3 + z) for Al-substituted Li 2MnO 3compounds. The Al substitution seems to occur both at Li and Mn sites, which could explain the presence of spinel phase. X-ray photoelectron spectroscopy for Mn 2p orbital reveals a significant decrease in binding energy for Li 1.0Al 0.33MnO 3 and Li 0.5Al 0.5MnO 3 compounds. Cyclic voltammetry, charge/discharge cycles and electrochemical impedance spectroscopy were also performed. A discharge capacity of 24 mAh g -1 for Li 2MnO 3, 68 mAh g -1 for Li 1.5Al 0.17MnO 3, 58 mAh g -1 for Li 1.0Al 0.33MnO 3 and 74 mAh g -1 for Li 0.5Al 0.5MnO 3 were obtained. As a result,more » aluminum substitutions increased the formation of spinel phase which is responsible for cycling.« less
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States); West Virginia Univ., Morgantown, WV (United States)
  3. Univ. of Puerto Rico, San Juan (Puerto Rico)
  4. Univ. Pierre et Marie Curie, Paris (France)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. B, Solid-State Materials for Advanced Technology
Additional Journal Information:
Journal Volume: 201; Journal Issue: C; Journal ID: ISSN 0921-5107
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; lithium ion battery; energy storage; Li2MnO3 cathode; Al substitution
OSTI Identifier:
1213338
Alternate Identifier(s):
OSTI ID: 1359593