Reversible Intercalation of Li Ions in an Earth-Abundant Phyllosilicate Clay
Reversible Intercalation of Li Ions in an Earth-Abundant Phyllosilicate Clay
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地球上储量丰富的页硅酸盐粘土中锂离子的可逆嵌入
DOI：
10.1021/acs.inorgchem.1c03834
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发表时间：
2022
影响因子：
4.6
通讯作者：
Melot, Brent C.
中科院分区：
文献类型：
--
作者：
Stiles, Joseph W.;McClure, Eric T.;Bashian, Nicholas H.;Tappan, Bryce A.;Melot, Brent C.
层状硅酸盐黏土家族是一种有趣的材料集合，由于它们的分层拓扑结构和广泛可调的组成空间，它们成为研究碱离子嵌入的理想模型。在这种精神下，我们提出了一种水热法制备层状叶状硅酸铁粘土Fe2Si4O10(OH)2，并对其电化学性能进行了评价，以（de）插入Li离子。通过仔细的结构细化，我们确定这种铁粘土含有2:1的堆积顺序，这与广泛研究的矿物蒙脱土直接相似，其晶体呈片状形态。循环伏安法和恒流循环法揭示了锂通过固溶机制可逆地插入到间隙层中。离子（脱）插层与其他粘土体系（如白云母、KFe2.75Si3.25O10(OH)2）的对比表明，控制层间净电荷与层状硅酸盐矿物是实现结构内可逆阳离子插层的途径。
The phyllosilicate family of clays is an intriguing collection of materials that make ideal models for studying the intercalation of alkali ions due to their layered topology and broadly tunable composition space. In this spirit, we present a hydrothermal method to prepare a layered iron phyllosilicate clay, Fe2Si4O10(OH)2, and an evaluation of its electrochemical performance for the (de)insertion of Li ions. Through careful structural refinement, we determined that this iron clay contains a 2:1 stacking sequence, which is directly analogous to the widely studied mineral montmorillonite, with the crystallites adopting a platelike morphology. Cyclic voltammetry and galvanostatic cycling reveal reversible insertion of lithium into the interstitial layers via a solid solution mechanism. Comparison of ion (de)intercalation with reports on other clay systems like muscovite, KFe2.75Si3.25O10(OH)2, which features a rigidly bound interlayer cation, demonstrates that controlling the net charge on the layers with phyllosilicate minerals is a route to enabling reversible cationic intercalation within the structure.