high tap density spherical li[ni0.5mn0.3co0.2]o2 cathode material synthesized via continuous hydroxide coprecipitation method for advanced lithium-ion batteries
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2012
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Abstract
Spherical [Ni0.5Mn0.3Co0.2](OH)2 precursor with narrow size distribution and high tap density has been successfully synthesized by a continuous hydroxide coprecipitation, and Li[Ni0.5Mn0.3Co0.2]O2 is then prepared by mixing the precursor with 6% excess Li2CO3 followed by calcinations. The tap density of the obtained Li[Ni0.5Mn0.3Co0.2]O2 powder is as high as 2.61 g cm−3. The powders are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), particle size distribution (PSD), and charge/discharge cycling. The XRD studies show that the prepared Li[Ni0.5Mn0.3Co0.2]O2 has a well-ordered layered structure without any impurity phases. Good packing properties of spherical secondary particles (about 12 μm) consisted of a large number of tiny-thin plate-shape primary particles (less than 1 μm), which can be identified from the SEM observations. In the voltage range of 3.0–4.3 V and 2.5–4.6 V, Li[Ni0.5Mn0.3Co0.2]O2 delivers the initial discharge capacity of approximately 175 and 214 mAh g−1 at a current density of 32 mA g−1, and the capacity retention after 50 cycles reaches 98.8% and 90.2%, respectively. Besides, it displays good high-temperature characteristics and excellent rate capability.
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yang2012internationalhigh
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| Authors | ;Shunyi Yang;Xianyou Wang;Xiukang Yang;Ziling Liu;Qiliang Wei;Hongbo Shu |
| Journal | BMJ open quality |
| Year | 2012 |
| DOI |
10.1155/2012/323560
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