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Synthesis of layered LiMnO_2 by in situ oxidation-intercalation and a study of the- reaction mechanism and electrochemical performance

机译:原位氧化嵌入合成层状LiMnO_2及其反应机理和电化学性能的研究

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摘要

Using Mn(OH)_2 as precursor, LiOH as lithiating agent and (NH_4)_2S_2O_8 as oxidant, layered o-LiMnO_2 was obtained by a novel method--in situ oxidation-intercalation under mild conditions (80 deg C). The product was characterized by XRD, ICP, TEM and 7Li-NMR. The results reveal that orthorhombic LiMnO_2 with high purity and good crystallinity can be obtained by this method. During electrochemical tests, a LiMnO_2/Li cell shows an initial reversible capacity of 208 mAh centre dot g~(-1) and a reversible capacity of 180 mAh centre dot g~(-1) after 30 cycles at room temperature.
机译:以Mn(OH)_2为前驱体,LiOH为锂化剂,(NH_4)_2S_2O_8为氧化剂,通过新颖的方法在温和的条件下(80℃)原位氧化嵌入获得了层状的o-LiMnO_2。用XRD,ICP,TEM和7Li-NMR对产物进行表征。结果表明,该方法可以得到高纯度,良好结晶度的正交晶LiMnO_2。在电化学测试中,LiMnO_2 / Li电池在室温下经过30个循环后,其初始可逆容量为208 mAh中心点g〜(-1),可逆容量为180 mAh中心点g〜(-1)。

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