Mitigating the P2-O2 phase transition of high-voltage P2-Na2/3[Ni1/3Mn2/3]O2 cathodes by cobalt gradient substitution for high-rate sodium-ion batteries

被引:56
|
作者
Hou, Peiyu [1 ]
Li, Feng [2 ]
Wang, Yangyang [2 ]
Yin, Jiangmei [1 ]
Xu, Xijin [1 ]
机构
[1] Univ Jinan, Sch Phys & Technol, Jinan 250022, Shandong, Peoples R China
[2] Nankai Univ, Natl Inst Adv Mat, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China
基金
中国国家自然科学基金;
关键词
LAYERED OXIDE CATHODES; HIGH-ENERGY DENSITY; LONG-LIFE; ELECTROCHEMICAL PERFORMANCE; ELECTRODE MATERIALS; POSITIVE-ELECTRODE; PHOSPHONATE; CARBON; FABRICATION; MODULATION;
D O I
10.1039/c8ta10980j
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
High-voltage P2-Na-2/3[Ni1/3Mn2/3]O-2 as a high energy density cathode for sodium-ion batteries (SIBs) has attracted considerable attention. But the unfavorable P2-O2 phase transition and electrode/electrolyte side reactions easily occur when charged above 4.2 V (vs. Na/Na+), resulting in the rapid decay of capacity. Here, for the first time, a nanoscale cobalt gradient substitution is introduced to build a Co-enriched surface and cobalt-substituted interior, in which the cobalt-enriched surface is expected to reduce the side reactions and improve the Na+ kinetics while the cobalt substitution is supposed to mitigate the P2-O2 transition. Correspondingly, this gradient cobalt substituted P2-Na-2/3[Ni1/3Mn2/3]O-2 delivers a large reversible capacity of 164.6 mA h g(-1) with a high median potential of 3.55 V, achieving a high energy density of approximate to 585 W h kg(-1) and is comparable to the LiCoO2 cathode in lithium-ion batteries. As anticipated, it shows a mitigated P2-O2 transition and thus exhibits an improved cycling stability. Besides, it delivers a much higher capacity of 110 mA h g(-1) at a high rate of 10C than reported pristine and modified electrodes by bulk doping and surface coating, indicating better high-rate properties. These gratifying achievements make this nanoscale gradient substitution an effective approach for suppressing the P2-O2 transition and improving the Na+ kinetics of P2-Na-2/3[Ni1/3Mn2/3]O-2 cathodes.
引用
收藏
页码:4705 / 4713
页数:9
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