Improvement of Cathode Properties by Lithium Excess in Disordered Rocksalt Li<sub>2+2</sub><i><sub>x</sub></i>Mn<sub>1−</sub><i><sub>x</sub></i>Ti<sub>1−</sub><i><sub>x</sub></i>O<sub>4</sub>

Ayuko Kitajou, Kosuke Tanaka, Hidenori Miki, Hideyuki Koga, Toshihiro Okajima, Shigeto Okada

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Although Li<sub>2</sub>MnTiO<sub>4</sub> has a large theoretical capacity (295 mAh g<sup>−1</sup>), the cathode utilization is limited due to the mixed cation occupation in the disordered rocksalt structure. In this study, we have attempted to prepare single-phase Li<sub>2+2</sub><i><sub>x</sub></i>Mn<sub>1−</sub><i><sub>x</sub></i>Ti<sub>1−</sub><i><sub>x</sub></i>O<sub>4</sub> compositions (0 ≤ <i>x</i> ≤ 0.3) with Li excess to further improve the cathode properties of Li<sub>2</sub>MnTiO<sub>4</sub>. The rechargeable capacity of the synthesized Li<sub>2.4</sub>Mn<sub>0.8</sub>Ti<sub>0.8</sub>O<sub>4</sub> composition was above 220 mAh g<sup>−1</sup>, which is larger than those of other disordered Li<sub>2</sub>MTiO<sub>4</sub> (M = Ni, Co, Mn and Fe) series. Moreover, the discharge capacity of Li<sub>2.4</sub>Mn<sub>0.8</sub>Ti<sub>0.8</sub>O<sub>4</sub> was ca. 190 mAh g<sup>−1</sup> after the 15th cycle, and its capacity retention was 82%.
Original languageEnglish
Pages (from-to)597-600
Number of pages4
Issue number8
Publication statusPublished - 2016


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