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Title: Modulating Anion Redox Activity of Li₁.₂Mn0.54Ni₀.₁₃Co₀.₁₃O₂ through Strong Sr−O Bonds toward Achieving Stable Li-Ion Half-/Full-Cell Performance
Authors: Murugan, Vivekanantha
Arul Saravanan, Raaju Sundhar
Thangaian, Kesavan
Partheeban, Thamodaran
Aravindan, Vanchiappan
Srinivasan, Madhavi
Sasidharan, Manickam
Bharathi, K. Kamala
Keywords: Engineering::Materials
Issue Date: 2021
Source: Murugan, V., Arul Saravanan, R. S., Thangaian, K., Partheeban, T., Aravindan, V., Srinivasan, M., Sasidharan, M. & Bharathi, K. K. (2021). Modulating Anion Redox Activity of Li₁.₂Mn0.54Ni₀.₁₃Co₀.₁₃O₂ through Strong Sr−O Bonds toward Achieving Stable Li-Ion Half-/Full-Cell Performance. ACS Applied Energy Materials, 4(10), 11234-11247.
Project: NRFI2017-08 
Journal: ACS Applied Energy Materials 
Abstract: Controlled synthesis and compositional modification of Li-rich layered oxides (LLOs) Li1.2Mn0.54Co0.13Ni0.13O2 is considered as a potential strategy to achieve high structural stability/reversibility, suppressed voltage/capacity fading, and realize stable cycle life performance in lithium-ion batteries (LIBs). In this study, the effect of strontium (Sr2+) doping in Li1.2−2xSrxMn0.54Co0.13Ni0.13O2 (0.0015 ≤ x ≤ 0.007) is systematically investigated by electrochemical studies. X-ray refinement studies reveal the occupancy of Sr2+ at Li+ (lithium) sites with larger oxygen-lithium-oxygen inter-slab spacing in crystal structure. Investigation of Sr2+ doped materials in Li-ion cell furnishes up to ~50% reduction in anionic redox activity during the first charge cycle compared to LLO. Ex-situ structural analysis of LLO and Sr2+−doped samples shows suppressed layered to spinel phase transformation for the latter. The Sr2+− doped electrode (x=0.005) delivers ~70 Wh kg−1 more energy (620 Wh kg−1) than the LLO at 0.2C. Besides, testing for 500 cycles at 1C, Sr2+−doped cathode (x=0.005) retains ~94% of its initial capacity as against LLO (68%). High temperature study at 55 °C shows better electrochemical performance indicating good structural stability of Sr2+−doped samples. Moreover, in full-cell configuration, Sr2+−doped cathode (x=0.005) retains ~98% of its initial capacity at 0.5C after 50 cycles unlike LLO (55%).
ISSN: 2574-0962
DOI: 10.1021/acsaem.1c02090
Schools: School of Materials Science and Engineering 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Energy Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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