Charge-Discharge Property of Non-Stoichiometric Lithium Iron Silicate
Charge-Discharge Property of Non-Stoichiometric Lithium Iron Silicate
复制标题
非化学计量硅酸铁锂的充放电性能
DOI：
10.1149/08010.0111ecst
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Y. Orikasa
中科院分区：
文献类型：
--
作者：
R. Matsui;M. Katayama;Y. Inada;Y. Orikasa
硅酸铁锂Li 2FeSiO 4显示出高的理论容量;然而，可逆的充放电反应实际上仅在铁的二价和三价之间进行，并且不涉及过量的锂离子。在本研究中，我们试图通过合成非化学计量的化合物来最大化铁氧化还原对的量。在高度非化学计量组成中，观察到由于杂质相导致的充放电容量降低，但是在少量锂缺乏组成的情况下，观察到容量增加和倍率性能的改善。
Lithium iron silicate, Li2FeSiO4 exhibits a high theoretical capacity; however, the reversible charge-discharge reaction is proceeded actually only between the divalent and the trivalent of iron, and the excess lithium ion is not involved. In this study, we attempted to maximize the amount of iron redox couple by synthesizing non-stoichiometric compound compounds. In the highly non-stoichiometric composition, the charge-discharge capacity decreased due to the impurity phase was observed, but in the case of a small amount of lithium deficient composition the capacity increase and the improvement of rate capability were observed.