Electrochemical and Thermal Evolution of P2 Na2/3MnO2

被引：1

作者：

Thilakarathna, B. D. K. K. ^{[1
]}

Mittal, Uttam ^{[1
]}

Peng, Jian ^{[1
]}

Brocklebank, Daniel ^{[1
]}

Brand, Helen E. A. ^{[2
]}

Sharma, Neeraj ^{[1
]}

机构：

[1] UNSW, Sch Chem, Sydney, NSW 2052, Australia

[2] Australian Nucl Sci & Technol Org, Australian Synchrotron, 800 Blackburn Rd, Clayton, Vic 3168, Australia

来源：

CHEMPHYSCHEM | 2025年 / 26卷 / 05期

基金：

澳大利亚研究理事会;

关键词：

Structural evolution; Sodium-ion batteries; Cathode; Synchrotron X-ray powder diffraction; X LESS-THAN; CATHODE MATERIALS; ION BATTERY; PERFORMANCE; NA0.67MNO2; OXIDES; CU;

D O I：

10.1002/cphc.202400832

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

P2 Na2/3MnO2 can be used as a cathode material in sodium-ion batteries. Here, the electrochemical-temperature-dependent evolution of P2 Na2/3MnO2 is investigated using X-ray powder diffraction. P2 Na2/3MnO2 powder under a N2 atmosphere shows evidence of the formation of a monoclinic C2/m phase, from about 450 degrees C. The P2 Na2/3MnO2 electrode sealed in a capillary undergoes a sequence of phase transitions from the as-prepared hexagonal P63/mmc to a secondary hexagonal P63/mmc phase followed by a transition to Mn3O4 and subsequently MnO. NaF also appears parallel to the formation of the secondary hexagonal phase. These transitions suggest a local reducing environment as the Mn oxidation state evolves from 3+/4+ to 2+. The samples at various states of charge show similar thermal evolution with the exception of the discharged (Na-inserted) state which features a slightly more complex evolution. Understanding the structure and thermal evolution at various states of charge and under various conditions provides insight into the stability of these potential cathode materials.

引用

页数：10

共 44 条

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