Effect of Mn substitution on the structural, morphological and electrochemical behaviors of Li2Fe1−xMnxSiO4 synthesized via citric acid assisted sol–gel method
Effect of Mn substitution on the structural, morphological and electrochemical behaviors of Li2Fe1−xMnxSiO4 synthesized via citric acid assisted sol–gel method
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DOI：
10.1016/j.jallcom.2009.08.007
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发表时间：
2009-11
影响因子：
6.2
通讯作者：
Chaoyong Deng;Shuren Zhang;S. Y. Yang
中科院分区：
文献类型：
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作者：
Chaoyong Deng;Shuren Zhang;S. Y. Yang
采用柠檬酸辅助溶胶-凝胶法合成了Li2(Fe1−xMnx)SiO4(x=0，0.3，0.5，0.7，1)正极材料。研究了Mn掺杂对Li2(Fe1−xMnx)SiO4的结构、形貌和电化学行为的影响。所制备的Li2(Fe1−xMnx)SiO4样品都可以以Pmn21空间群中的正交晶胞为标度，且它们的晶格参数相似。在样品中可以观察到纳米颗粒。放电容量随x的增大先增大后减小，当x=0.5时，放电容量达到最大值。然而，Li_2(Fe_1-−_xMnx)SiO_4样品的循环性能随着x的增加而降低，同时，Mn的替代降低了Li_2(Fe_1-−_xMnx)SiO_4样品的电化学可逆性。
Li2(Fe1−xMnx)SiO4(x=0, 0.3, 0.5, 0.7, 1) cathode materials have been synthesized via citric acid assisted sol–gel method. The effects of Mn substitution on the structural, morphological and electrochemical behaviors of Li2(Fe1−xMnx)SiO4are investigated. The prepared Li2(Fe1−xMnx)SiO4samples can all be indexed on the basis of the orthorhombic unit cell in space group Pmn21, and their lattice parameters are similar. Nanoparticles can be observed in the samples. The discharge capacity first increases and then decreases with increasing x. The maximum discharge capacity is obtained when x is equal to 0.5. However, the cycling performance of the Li2(Fe1−xMnx)SiO4samples decreases with increasing x. At the same time, Mn substitution lowers the electrochemical reversibility of the Li2(Fe1−xMnx)SiO4samples.