کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1649968 | 1007594 | 2009 | 4 صفحه PDF | دانلود رایگان |
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The coprecipitation of Ni and Mn hydroxides followed by freeze drying results in the formation of agglomerated 20–30 nm particles of complex hydroxide with spinel-like structure. The thermal decomposition of this hydroxide causes the formation of ilmenite-type complex oxide at T > 300 °C without considerable changes in the Ni and Mn valence states according to X-ray photoelectron spectroscopy data. Further processing at T ≤ 400 °C is accompanied by significant particle intergrowth though their internal structure remains nanostructured. Ni–Mn oxide- and hydroxide-based electrodes revealed a significant reversible electrochemical activity in the alkaline electrolytes and an extended operating voltage window (~ 1.8 V). Ni–Mn ilmenite-based electrode materials demonstrated a low fade rate and high specific electrochemical capacity values at high discharge rates (up to 70 mAh g− 1 at I = 70 mA cm− 2) that makes feasible their application in high rate batteries and electrochemical supercapacitors.
Journal: Materials Letters - Volume 63, Issue 1, 15 January 2009, Pages 109–112