Intermediate honeycomb ordering to trigger oxygen redox chemistry in layered battery electrode

被引：272

作者：

de Boisse, Benoit Mortemard ^{[1
,2
]}

Liu, Guandong ^{[1
]}

Ma, Jiangtao ^{[1
]}

Nishimura, Shin-ichi ^{[1
,2
]}

Chung, Sai-Cheong ^{[1
,2
]}

Kiuchi, Hisao ^{[3
]}

Harada, Yoshihisa ^{[4
,5
]}

Kikkawa, Jun ^{[6
]}

Kobayashi, Yoshio ^{[7
,8
]}

Okubo, Masashi ^{[1
,2
]}

Yamada, Atsuo ^{[1
,2
]}

机构：

[1] Univ Tokyo, Sch Engn, Dept Chem Syst Engn, Bunkyo Ku, Hongo 7-3-1, Tokyo 1138656, Japan

[2] Kyoto Univ, Elements Strategy Initiat Catalysts & Batteries, Nishikyo Ku, Kyoto 6158245, Japan

[3] Univ Tokyo, Sch Engn, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan

[4] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[5] Univ Tokyo, Synchrotron Radiat Res Org, Tatsuno, Hyogo 6795165, Japan

[6] Natl Inst Mat Sci, Adv Key Technol Div, Tsukuba, Ibaraki 3050044, Japan

[7] Univ Electrocommun, Dept Engn Sci, Chofu, Tokyo 1828585, Japan

[8] RIKEN, RIKEN Nishina Ctr Accelerator Based Sci, Wako, Saitama 3510198, Japan

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

关键词：

POSITIVE ELECTRODE; ION BATTERIES; ANIONIC REDOX; CATHODE; PERFORMANCE; VISUALIZATION; OXIDES;

D O I：

10.1038/ncomms11397

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Sodium-ion batteries are attractive energy storage media owing to the abundance of sodium, but the low capacities of available cathode materials make them impractical. Sodium-excess metal oxides Na2MO3 (M: transition metal) are appealing cathode materials that may realize large capacities through additional oxygen redox reaction. However, the general strategies for enhancing the capacity of Na2MO3 are poorly established. Here using two polymorphs of Na2RuO3, we demonstrate the critical role of honeycomb-type cation ordering in Na2MO3. Ordered Na2RuO3 with honeycomb-ordered [Na1/3Ru2/3]O-2 slabs delivers a capacity of 180 mAhg(-1) (1.3-electron reaction), whereas disordered Na2RuO3 only delivers 135 mAhg(-1) (1.0-electron reaction). We clarify that the large extra capacity of ordered Na2RuO3 is enabled by a spontaneously ordered intermediate Na1RuO3 phase with ilmenite O1 structure, which induces frontier orbital reorganization to trigger the oxygen redox reaction, unveiling a general requisite for the stable oxygen redox reaction in high-capacity Na2MO3 cathodes.

引用

页数：9

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