Superior Lithium Storage Properties of Carbon Coated Li2MnSiO4 Cathodes
Superior Lithium Storage Properties of Carbon Coated Li2MnSiO4 Cathodes
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DOI：
10.1149/1.3543568
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发表时间：
2011-04
影响因子：
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通讯作者：
V. Aravindan;K. Karthikeyan;S. Amaresh;Yun‐Sung Lee
中科院分区：
文献类型：
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作者：
V. Aravindan;K. Karthikeyan;S. Amaresh;Yun‐Sung Lee
Li 2 MnSiO 4 采用固相反应法在Ar气氛中900 o C的优化条件下合成。这里，己二酸用作碳的原料。粉末X射线衍射测量证实了Li 2 MnSiO 4 相的形成。 Li/Li 2 MnSiO 4 电池在 C/20 倍率下的初始放电容量为 160 mAh g–1。经过几次初始循环后，电池表现出稳定的放电行为~ 140 mAh g-1，库伦效率超过 90%。我们首次观察到Li 2 MnSiO 4 电极如此稳定的放电行为。因此，稳定性的提高归功于化合物以及碳源材料的适当优化。
Li 2 MnSiO 4 is synthesized by solid state reaction method under the optimized conditions of 900 o C in Ar atmosphere. Here, adipic acid is used as the source material for carbon. Powder X-ray diffraction measurements confirm the Li 2 MnSiO 4 phase formation. The Li/Li 2 MnSiO 4 cell delivers initial discharge capacity of 160 mAh g–1 at C/20 rate. After a few initial cycles, the cell exhibits a stable discharge behavior∼ 140 mAh g–1 with coloumbic efficiency over 90%. For the first time, we observed such stable discharge behavior for Li 2 MnSiO 4 electrodes. Thus, improved stability is due to proper optimization of the compound as well as the source material for carbon.