A Targeted Functional Design for Highly Efficient and Stable Cathodes for Rechargeable Li-Ion Batteries
A Targeted Functional Design for Highly Efficient and Stable Cathodes for Rechargeable Li-Ion Batteries
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可充电锂离子电池高效稳定正极的针对性功能设计
DOI：
10.1002/adfm.201604903
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发表时间：
2017-01-01
影响因子：
19
通讯作者：
Parkin, Ivan P.
中科院分区：
文献类型：
--
作者：
He, Guanjie;Han, Xiaoyu;Parkin, Ivan P.
尽管迄今为止锂离子电池（LIB）取得了巨大成功，但随着便携式设备和电动汽车等新一代电子产品的出现，提出了更高的需求。即使阳极有所改进，高容量和持久耐用的阴极仍然是一个挑战。这项工作报道了碳布上的新型 3D NiCo2O4@V2O5 核壳阵列 (CSA) 作为 LIB 的阴极。基于骨架的总质量和活性材料的量，纳米设计的材料实现了具有高功率比的V2O5的理论比容量。该电极实现了卓越的循环稳定性，是迄今为止报道过的最稳定的锂离子电池阴极之一。从原位透射电子显微镜和量子水平计算来看，3D NiCo2O4 纳米片框架提供了高电子电导率和坚固的 CSA 骨架，而无需参与锂化/脱锂；层状V2O5的厚度对于Li扩散率和电极的容量贡献起着关键作用。本文的结构指向了锂离子电池阴极高性能纳米结构的新设计理念。
Despite the great success of Li-ion batteries (LIBs) up to now, higher demand has been raised with the emergence of the new generation electrics, such as portable devices and electrical vehicles. Even with the improvement on anodes, the cathodes with high capacity and long-lastingness still remain a challenge. New 3D NiCo2O4@V2O5 core-shell arrays (CSAs) on carbon cloth as cathodes in LIBs have been reported in this work. The nanodesigned materials realize the theoretical specific capacity of V2O5 with high power rate based on the total mass of the framework and amount of active materials. The electrodes achieve superb cycling stability, among the most stable cathodes for LIBs ever reported. From both in situ transmission electron microscopy and quantum level calculations, the 3D NiCo2O4 nanosheet frameworks provide high electron conductivity and the skeleton of the robust CSAs without participating in the lithiation/delithiation; the thickness of the layered V2O5 plays a key role for Li diffusivity and the capacity contribution of electrodes. The structures herein point to new design concepts for high-performance nanoarchitectures for LIB cathodes.