The Synergetic Effects of Ru and Al Co‐Doping for Improved Cyclability of LiCoO2 at High Voltages

材料科学 兴奋剂 阴极 电压 氧化物 格子(音乐) 电化学 纳米技术 化学工程 光电子学 电极 化学 电气工程 物理化学 冶金 物理 声学 工程类
作者
Zhenguo Cheng,Xiang Ma,Suwei Mou,Yi Zhang,Fang Wu,Yong Xiang,Xiaokun Zhang
出处
期刊:Advanced sustainable systems [Wiley]
被引量:5
标识
DOI:10.1002/adsu.202300325
摘要

Abstract LiCoO 2 is one of the most extensively deployed cathode materials in commercial lithium‐ion batteries. However, it remains a challenge to fulfill the potential specific capacity of LiCoO 2 during long‐term cycling, due to the lattice degradations in deep delithiation states. Herein, a dual doping scheme based on Ru and Al is explored, which improves the cyclability of LiCoO 2 at high voltages through synergistically reconfiguring electronic structure and stabilizing lattice structure. It is well known that the doped Al will serve as a strong positively charged center and restrain the lattice distortion. The doping of Ru suppresses the occupied O:2p states below Fermi level and stabilizes oxygen redox during cycling. The proposed dual doping strategy improves the accessible energy density and cyclability of LiCoO 2 at increased voltages significantly. For example, the dual doped LiCoO 2 performs 19% higher energy density at 4.57 V versus Li + /Li than the pristine one. In addition, an initial capacity of 197 mAh g −1 and 86% capacity retention after 100 cycles are achieved from 3.00 to 4.53 V versus Li + /Li. This study sheds a light on the fundamental principles for the development of high‐voltage LiCoO 2 and other layered oxide cathode materials with high energy density and excellent cyclability.
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