Title: Synthesis and electrochemical characterization of Cr-doped lithium-rich Li1.2Ni0.16Mn0.56Co0.08-xCrxO2 cathodes

Journal Article · · Emergent Materials

Lithium-rich layer oxide, Li1.2Ni0.16Mn0.56Co0.08O2 (NMC), is a possible cathode candidate for high-energy density batteries. Issues such as cycling stability, rate performance, and cost are yet to be overcome before successful commercialization of the material. In this work, we report on the synthesis of Cr-doped lithium-rich phases Li1.2Ni0.16Mn0.56Co0.08-xCrxO2 (where x=0.00, 0.01, and 0.02) (NMC-Cr) by the sol-gel technique. Cr is homogeneously distributed in the crystal structure evidence by elemental mapping measurements. The Cr-doped materials exhibit much better cycling stability with 100% capacity retention versus 44% for the undoped sample after 50 cycles. The Cr-doped samples show excellent electrochemical performance at higher C-rate in comparison with the undoped NMC. The latter shows rapid capacity fading from 220 to 50 mAh g₋1 at the 0.1 to 1C rates, respectively. Moreover, the Cr-containing materials do not show significant signs of voltage fading during cycling owing to the stabilization of the crystal lattice by Cr. The electrochemical impedance spectroscopy measurements also indicate the stable cell resistance on cycling for the Cr-doped phases compared to the undoped phase.Open image in new window

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1566942
Journal Information:
Emergent Materials, Journal Name: Emergent Materials Journal Issue: 3-4 Vol. 1; ISSN 2522-5731
Country of Publication:
United States
Language:
English

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