Zezhou Lin, Yiran Ying, Zhihang Xu, Gao Chen, Xi Gong, Zehua Wang, Daqin Guan, Leqi Zhao, Mingyang Yang, Ke Fan, Tiancheng Liu, Hao LI, Honglei Zhang, Huangxu Li, Xi Zhang, Ye Zhu, Zhou-Guang Lu, Zongping Shao, Peiyu Hou, Haitao Huang
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引用次数: 0
Abstract
Increasing upper cut-off voltage is a useful way for enhancing specific capacity of LiCoO2 (LCO) cathode and the energy density of corresponding lithium-ion batteries (LIBs), while the main challenge is concurrent phase transition associated with oxygen evolution reaction that results in quick decay in electrochemical performance. Here, we report a significant improvement in both capacity and durability at high voltage by simply growing an AlPO4-5 zeolite protecting layer over LCO, with good crystallinity, ordered porous channels and full surface coverage. Such coating, realized by using triethylamine as a template, acts multifunctionally to remarkably alleviative phase transition via suppressing the oxygen release at high voltage, enable fast Li+ diffusion through its nanoporous structure, accelerate the Li+-desolvation on the cathode/electrolyte interface, and boost the redox kinetics, as supported by various in-situ and ex-situ measurements of LCO@AlPO4-5 zeolite (LCO@Z) cathode under a high cut-off voltage of 4.6 V (vs. Li/Li+) and density functional theory (DFT) calculations. As a result, the surface engineered LCO@Z electrode exhibits outstanding cycling stability (capacity retention of 90.3% after 200 cycles) and high-rate capability (108.2 mAh g-1 at 10C). Such zeolite coating strategy provides a new way for developing high-energy-density LIBs with great application potential.
期刊介绍:
Chemical Reviews is a highly regarded and highest-ranked journal covering the general topic of chemistry. Its mission is to provide comprehensive, authoritative, critical, and readable reviews of important recent research in organic, inorganic, physical, analytical, theoretical, and biological chemistry.
Since 1985, Chemical Reviews has also published periodic thematic issues that focus on a single theme or direction of emerging research.