Modulating Anion Redox Activity of Li<sub>1.2</sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub> through Strong Sr–O Bonds toward Achieving Stable Li-Ion Half-/Full-Cell Performance
نویسندگان
چکیده
Controlled synthesis and compositional modification of Li-rich layered oxides (LLOs), Li1.2Mn0.54Co0.13Ni0.13O2, are considered as potential strategies to achieve high structural stability/reversibility suppressed voltage/capacity fading for realizing stable cycle life performance in lithium-ion batteries (LIBs). In this study, the effect strontium (Sr2+) doping Li1.2–2xSrxMn0.54Co0.13Ni0.13O2 (0.0015 ≤ x 0.007) is systematically investigated by electrochemical studies. X-ray refinement studies reveal occupancy Sr2+ at Li+ (lithium) sites with larger oxygen–lithium–oxygen interslab spacing crystal structure. Investigation Sr2+-doped materials Li-ion cells furnishes up ∼50% reduction anionic redox activity during first charge compared LLO. Ex situ analysis LLO samples shows spinel phase transformation latter. The electrode (x = 0.005) delivers ∼70 W h kg–1 more energy (620 kg–1) than 0.2 C. Besides, testing 500 cycles 1 C, cathode retains ∼94% its initial capacity against (68%). High temperature study 55 °C better performance, indicating good stability samples. Moreover, full-cell configuration, ∼98% 0.5 C after 50 unlike (55%).
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ژورنال
عنوان ژورنال: ACS applied energy materials
سال: 2021
ISSN: ['2574-0962']
DOI: https://doi.org/10.1021/acsaem.1c02090