Highly-stable P2–Na0.67MnO2 electrode enabled by lattice tailoring and surface engineering

By Wenhua Zuo, Jimin Qiu, Xiangsi Liu, Bizhu Zheng, Yang Zhao, Jialin Li, Huajin He, Ke Zhou, Zhumei Xiao, Qi Li and 2 more. 2020

136 citations recorded by the source corpus.

Abstract One of the key challenges of sodium ion batteries is to develop sustainable, low-cost and high capacity cathodes, and this is the reason that layered sodium manganese oxides have attracted so much attention. However, the undesired phase transitions and poor electrolyte-electrode interfacial stability facilitate their capacity decay and limit their practical applications. Herein, we design a novel Al2O3@Na0.67Zn0.1Mn0.9O2 electrode to mitigate these problems, by taking the advantages of both structural stabilization and surface passivation via Zn2+ substitution and Al2O3 atomic layered deposition (ALD) coating, respectively. Long-range and local structural analyses during charging/discharging processes indicate that P2–P2’ phase transformation can be suppressed by substituting proper amount of Mn3+ Jahn-Teller centers with Zn2+, whereas excessive Zn2+ leads to P2-OP4 structure transition at low sodium contents and facilitates the electrode degradations. Furthermore, the homogeneous and robust cathode electrolyte interphase (CEI) layers formed on the Al2O3-coated electrodes effectively hinder the organic electrolytes from further decomposition. Therefore, our synergetic strategy of Zn2+ substitution and ALD surface engineering remarkably boosts the cycling performance of P2–Na0.67MnO2 and provides some new insights into the designing of highly stable cathode electrodes for sustainable sodium ion batteries.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/44273d3536b682636b6609c7c9022390c28057e0