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Effect of vacancy-tailored Mn3+ spinning on enhancing structural stability by Lu Yang; Zepeng Liu; Xi Shen; Shuwei Li; Zhiwei Hu; Qingyu Kong; Jun Ma; Jiedong Li; Hong-Ji Lin; Chien-Te Chen; Jin-Ming Chen; Shu-Chih Haw; Xuefeng Wang; Richeng Yu; Zhaoxiang Wang; Liquan Chen is a Engineering article available to read on EtoBox.

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The layered manganese oxide cathode materials suffer from the Jahn-Teller effect of the octahedral Mn 3 + ions at low potentials and the anionic oxidation triggered structural degradation at high potentials. Introduction of vacancies in the transition metal layer has proved effective in stabilizing the structure at both the high and low potentials. Herein we specially designed vacancy-containing P2-Na 2/3 [Zn 1/9 Mn 7/9 □ 1/9 ]O 2 (NZMO-Vac) and vacancy-free P2-Na 2/3 [Zn 2/9 Mn 7/9 ]O 2 (NZMO) to clarify how the vacancies tailor the spinning states of the Mn 3 + ions and benefit the structural stability and kinetic performances. The temperature-dependent magnetic susceptibility demonstrates the increase of the Jahn-Teller inactive low-spin Mn 3 + ions in NZMO-Vac at low potentials. Density functional theory calculations and advanced physical characterizations further indicate that the TM vacancies facilitate the generation of the low-spin Mn 3 + ions by decreasing the Mn-O bond length during discharging. These findings provide new ideas on designing cathode materials with higher specific capacities and robust structures.

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Author

Lu Yang; Zepeng Liu; Xi Shen; Shuwei Li; Zhiwei Hu; Qingyu Kong; Jun Ma; Jiedong Li; Hong-Ji Lin; Chien-Te Chen; Jin-Ming Chen; Shu-Chih Haw; Xuefeng Wang; Richeng Yu; Zhaoxiang Wang; Liquan Chen

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)