A Study of Cu Doping Effects in P2-Na0.75Mn0.6Fe0.2(CuxNi0.2-x)O2 Layered Cathodes for Sodium-Ion Batteries

被引：29
作者：
Wang, Yichao [1 ]
Kim, Sooran [1 ,2 ]
Lu, Jingyu [1 ]
Feng, Guangyuan [1 ]
Li, Xin [1 ]
机构：
[1] Harvard Univ, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA
[2] Kyungpook Natl Univ, Dept Phys Educ, Daegu 41566, South Korea
来源：
BATTERIES & SUPERCAPS | 2020年 / 3卷 / 04期
基金：
新加坡国家研究基金会; 美国国家科学基金会;
关键词：
Cu doping; diffusion; Jahn-Teller distortion; sodium-ion battery; oxygen redox; TOTAL-ENERGY CALCULATIONS; HIGH-CAPACITY; ELECTROCHEMICAL PROPERTIES; P2-TYPE; OXIDE; PERFORMANCE; PHASE; NI; SUBSTITUTION; ELECTRODE;
D O I：
10.1002/batt.201900172
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Layered sodium metal oxide cathodes have much broader choice of transition metal elements than the Li counterparts. A reversible Cu2+/3+ redox couple has recently been introduced in such Na cathodes. To study the role of Cu, here P2-type layered Na0.75Mn0.6Fe0.2(CuxNi0.2-x)O-2 compounds have been designed, synthesized and investigated. It shows the high initial capacity of 206 mAh/g and good capacity retention. Reversible oxygen redox activity is observed in our experiments. Our DFT calculations suggest that Cu can stabilize the oxygen redox by modifying the electronic structure together with Fe at high voltages. In addition, the strong P ' 2 transition observed at low voltages is induced by Jahn-Teller active Cu2+ with two competing effects of enhanced Na ion diffusivity and reduced electronic conductivity.
引用
收藏
页码：376 / 387
页数：12
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