Hierarchical Li1.2Ni0.2Mn0.6O2 Nanoplates with Exposed {010} Planes as High-Performance Cathode Material for Lithium-Ion Batteries
Hierarchical Li1.2Ni0.2Mn0.6O2 Nanoplates with Exposed {010} Planes as High-Performance Cathode Material for Lithium-Ion Batteries
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具有外露{010}面的分层Li1.2Ni0.2Mn0.6O2纳米板作为高性能锂离子电池正极材料
DOI：
10.1002/adma.201402541
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发表时间：
2014-10-22
影响因子：
29.4
通讯作者：
Wu, Feng
中科院分区：
文献类型：
--
作者：
Chen, Lai;Su, Yuefeng;Wu, Feng
DOI：10.1002/adma.包括（010）、（110）、（100）、（010）、（110）和（100）刻面的201402541平面[29，30]为Li+扩散提供了不受阻碍的路径。Sun的工作表明，层状阴极材料的倍率性能可以通过增加暴露的{010}活性平面的百分比来增强。[31然而，制备具有暴露的{010}面的层状材料仍然是一个巨大的挑战，因为这些高能面在合成过程中容易消失。[31]在此，为了联合收割机结合分层结构和分层结构的电化学活性{010}平面的优点，我们展示了一种通过合理设计的分层结构来产生暴露的{010}平面的高表面积的简单方法。以层状富锂材料Li 1.2 Mn 0.6 Ni 0.2 O2为例，验证了该方法的有效性，该方法依赖于径向排列的初级纳米片自发组装成分级准球体，如图1所示.结果表明，初始纳米片的侧面为{010}面，一旦实现定向排列，准球形纳米片的表面将以{010}面为主。然后，可以建立从球中心到表面的三维发散路径用于Li+传输，从而提供上级Li+嵌入/脱嵌动力学。因此，这种分层结构的富锂材料（HSLR）在作为LIB的阴极材料进行测试时，预期会产生出色的倍率性能。此外，由于分层形态，还预期良好的循环性能。
DOI: 10.1002/adma. 201402541 planes,[29, 30] including (010),(110),(100),(010),(110) and (100) facets, afford unimpeded paths for Li+ diffusion. Sun’s works have shown that the rate performance of layered cathode materials can be enhanced by increasing the percentage of exposed {010} active planes.[31, 32] However, it is still a huge challenge to prepare layered materials with exposed {010} planes, as these high-energy facets are easy to be vanished during synthesis.[31] Herein, in order to combine the advantages from the hierarchical architecture and the electrochemically active {010} planes of the layered structure, we demonstrate a facile approach for creating a high surface area of exposed {010} planes through a rational designed hierarchical structure. A layered lithium-rich material, Li 1.2Mn 0.6Ni 0.2O 2, is used here as an example to verify the validity of our strategy.Our approach relies on the spontaneous assembly of the radially aligned primary nanoplates into hierarchical quasi-spheres as shown in Scheme 1. It is demonstrated that the lateral planes of primary nanoplates are {010} planes, so once they realize the directional alignment as designed, the surface of quasi-spheres will be dominated by {010} planes. Then 3D divergent paths span from the center of spheres to the surface could be built up for Li+ transport, affording superior Li+ intercalate/deintercalate kinetics. As a consequence, this hierarchical structured lithium-rich material (HSLR) is expected to yield outstanding rate capability when tested as a cathode material for LIBs. Furthermore, good cycling performance is also anticipated because of the hierarchical morphology.