Factors influencing the chemical lithium extraction rate from layered LiNi1−y−zCoyMnzO2 cathodes
Factors influencing the chemical lithium extraction rate from layered LiNi1−y−zCoyMnzO2 cathodes
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DOI：
10.1016/j.elecom.2004.06.004
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发表时间：
2004-08
影响因子：
5.4
通讯作者：
Sivaramakrishnan Venkatraman;J. Choi;A. Manthiram
中科院分区：
文献类型：
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作者：
Sivaramakrishnan Venkatraman;J. Choi;A. Manthiram
研究了在乙腈介质中，以NO2 BF 4为氧化剂，从层状LiNi 1 −y− zCoyMnzO 2中化学提锂的速率.虽然所有的锂可以在30分钟内从富钴的LiNi 1 − yCoyO 2（0.5 μ y <0.5）中提取出来，但从富镍的LiNi 1 − yCoyO 2（0 μ y<0.5）和LiNi 1 − yMnyO 2（y=0.25和0.5）中提取所有的锂需要更长的时间（6-48 h）。在LiNi0.5 - 0.5yMn0.5 - 0.5yCoyO2样品的情况下，提取所有锂所需的时间随着Co含量的增加而减少。在富镍的LiNi 1 − yCoyO 2、LiNi 1 − zMnzO 2和贫钴的LiNi0.5−0.5yMn0.5 − 0.5yCoyO2系统中，缓慢的锂提取速率归因于相当大的阳离子无序，如X射线衍射数据的Rietveld分析所示。在LiNi 1 − yMnyO 2和贫钴LiNi0.5− 0.5yMn0.5− 0.5yCoyO2系统中，发现结构中较大的锂片间空间有助于锂的提取。
The rate of chemical lithium extraction from the layered LiNi1−y−zCoyMnzO2has been investigated with the oxidizer NO2BF4in acetonitrile medium. While all the lithium could be extracted in 30 min from the cobalt-rich LiNi1−yCoyO2(0.5⩽y⩽1), it takes a longer time (6–48 h) to extract all the lithium from the nickel-rich LiNi1−yCoyO2(0⩽y<0.5) and LiNi1−yMnyO2(y=0.25 and 0.5). In the case of LiNi0.5−0.5yMn0.5−0.5yCoyO2samples, the time required to extract all the lithium decreases with increasing Co content. The slow lithium extraction rate in the nickel-rich LiNi1−yCoyO2, LiNi1−zMnzO2, and cobalt-poor LiNi0.5−0.5yMn0.5−0.5yCoyO2systems is attributed to a considerable cation disorder as indicated by the Rietveld analysis of the X-ray diffraction data. In the LiNi1−yMnyO2and cobalt-poor LiNi0.5−0.5yMn0.5−0.5yCoyO2systems, a larger inter-slab space for lithium in the structure is found to help the lithium extraction.