材料科学
钠
离子
结晶学
相(物质)
阴极
晶体结构
电解质
快离子导体
公式单位
电化学
分析化学(期刊)
化学
物理化学
电极
有机化学
色谱法
冶金
作者
Zelang Jian,Chenchen Yuan,Wenze Han,Xia Lu,Lin Gu,Xuekui Xi,Yong‐Sheng Hu,Hong Li,Wen Chen,Dongfeng Chen,Yuichi Ikuhara,Liquan Chen
标识
DOI:10.1002/adfm.201400173
摘要
Na 3 V 2 (PO 4 ) 3 is one of the most important cathode materials for sodium‐ion batteries, delivering about two Na extraction/insertion from/into the unit structure. To understand the mechanism of sodium storage, a detailed structure of rhombohedral Na 3 V 2 (PO 4 ) 3 and its sodium extracted phase of NaV 2 (PO 4 ) 3 are investigated at the atomic scale using a variety of advanced techniques. It is found that two different Na sites (6b, M1 and 18e, M2) with different coordination environments co‐exist in Na 3 V 2 (PO 4 ) 3 , whereas only one Na site (6b, M1) exists in NaV 2 (PO 4 ) 3 . When Na is extracted from Na 3 V 2 (PO 4 ) 3 to form NaV 2 (PO 4 ) 3 , Na + occupying the M2 site (CN = 8) is extracted and the rest of the Na remains at M1 site (CN = 6). In addition, the Na atoms are not randomly distributed, possibly with an ordered arrangement in M2 sites locally for Na 3 V 2 (PO 4 ) 3 . Na + ions at the M1 sites in Na 3 V 2 (PO 4 ) 3 tend to remain immobilized, suggesting a direct M2‐to‐M2 conduction pathway. Only Na occupying the M2 sites can be extracted, suggesting about two Na atoms able to be extracted from the Na 3 V 2 (PO 4 ) 3 structure.
科研通智能强力驱动
Strongly Powered by AbleSci AI