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Synthesis and Characterization of a Multication Doped Mn Spinel, LiNi0.3Cu0.1Fe0.2Mn1.4O4, as 5 V Positive Electrode Material.

ABSTRACT: The suitability of multication doping to stabilize the disordered Fd3?m structure in a spinel is reported here. In this work, LiNi0.3Cu0.1Fe0.2Mn1.4O4 was synthesized via a sol-gel route at a calcination temperature of 850 °C. LiNi0.3Cu0.1Fe0.2Mn1.4O4 is evaluated as positive electrode material in a voltage range between 3.5 and 5.3 V (vs Li+/Li) with an initial specific discharge capacity of 126 mAh g-1 at a rate of C/2. This material shows good cycling stability with a capacity retention of 89% after 200 cycles and an excellent rate capability with the discharge capacity reaching 78 mAh g-1 at a rate of 20C. In operando X-ray diffraction (XRD) measurements with a laboratory X-ray source between 3.5 and 5.3 V at a rate of C/10 reveal that the (de)lithiation occurs via a solid-solution mechanism where a local variation of lithium content is observed. A simplified estimation based on the in operando XRD analysis suggests that around 17-31 mAh g-1 of discharge capacity in the first cycle is used for a reductive parasitic reaction, hindering a full lithiation of the positive electrode at the end of the first discharge.

SUBMITTER: Sharma P 

PROVIDER: S-EPMC7495482 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Synthesis and Characterization of a Multication Doped Mn Spinel, LiNi<sub>0.3</sub>Cu<sub>0.1</sub>Fe<sub>0.2</sub>Mn<sub>1.4</sub>O<sub>4</sub>, as 5 V Positive Electrode Material.

Sharma Priyanka P   Das Chittaranjan C   Indris Sylvio S   Bergfeldt Thomas T   Mereacre Liuda L   Knapp Michael M   Geckle Udo U   Ehrenberg Helmut H   Darma Mariyam Susana Dewi MSD  

ACS omega 20200831 36

The suitability of multication doping to stabilize the disordered <i>Fd</i>3̅<i>m</i> structure in a spinel is reported here. In this work, LiNi<sub>0.3</sub>Cu<sub>0.1</sub>Fe<sub>0.2</sub>Mn<sub>1.4</sub>O<sub>4</sub> was synthesized via a sol-gel route at a calcination temperature of 850 °C. LiNi<sub>0.3</sub>Cu<sub>0.1</sub>Fe<sub>0.2</sub>Mn<sub>1.4</sub>O<sub>4</sub> is evaluated as positive electrode material in a voltage range between 3.5 and 5.3 V (vs Li<sup>+</sup>/Li) with an initial  ...[more]

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