The influences of SO42− from electrolytic manganese dioxide precursor on the electrochemical properties of Li-rich Mn-based material for Li-ion batteries
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A series of layered Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode materials, of which manganese source was electrolytic manganese dioxide, with different contents of SO42− were successfully synthesized via ball-milling process and solid-state sintering method. The obtained materials were characterized by XRD, XPS, SEM-EDS, C-S, ICP, and HR-TEM. All the obtained materials presented well-ordered layered structure. When the content of SO42− was below 1.30 wt%, the electrochemical properties and structural stabilities at low rate for the layered materials with SO42− were not changed dramatically, while when the content of SO42− increased to 5.85 wt%, the initial discharge capacities decreased dramatically from 248.24 to 209.23 mAh g−1 at 10 mA g−1. And the pristine sample shows excellent cyclic property and rate capability. It delivered the discharge capacity of 175.25 mAh g−1 after 100 cycles with the highest capacity retention of 90.67% at 200 mA g−1. Particularly, the treated Li-rich Mn-based materials with the highest amount of SO42− exhibited the best cyclic stability and it delivers the highest capacity retention of 95.17% after 100 cycles at 200 mA g−1. However, its discharge capacities were much lower than the pristine material. As a result, the addition of SO42− could promote side reactions between electrode and electrolyte and deep-degree corrosion of electrode materials to affect the electrochemical properties and structural stabilities of the Li-rich Mn-based materials.
KeywordsSulfate ions Ball milling EMD Li-rich materials Electrolyte
This work was supported by the National Natural Science Foundation of China (Grant No. 51574287, No. 51704332, No. 51674295 and No. 51674296), and the Program of Strategic Emerging Industries of Hunan Province, China (Grant No. 2017GK4019). This work received financial support from the collaborative Innovation center of Manganese-Zinc-Vanadium Industrial Technology (the 2011 plan of Hunan province). We also thank the Advanced Research Center of CSU for performing the HRTEM examination.
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