Radially aligned hierarchical columnar structure as a cathode material for high energy density sodium-ion batteries

被引：250

作者：

Hwang, Jang-Yeon ^{[1
]}

Oh, Seung-Min ^{[1
]}

Myung, Seung-Taek ^{[2
]}

Chung, Kyung Yoon ^{[3
]}

Belharouak, Ilias ^{[4
]}

Sun, Yang-Kook ^{[1
]}

机构：

[1] Hanyang Univ, Dept Energy Engn, Seoul 133791, South Korea

[2] Sejong Univ, Dept Nano Engn, Seoul 143747, South Korea

[3] Korea Inst Sci & Technol, Ctr Energy Convergence Res, Seoul 136791, South Korea

[4] Qatar Fdn, Qatar Environm & Energy Res Inst, Doha, Qatar

来源：

NATURE COMMUNICATIONS | 2015年 / 6卷

关键词：

LOW-TEMPERATURE PERFORMANCE; HIGH-CAPACITY; ELECTROCHEMICAL INTERCALATION; ELECTRODE PERFORMANCE; POSITIVE ELECTRODE; NAXCOO2; P2-TYPE; NACRO2; ANODE; POWER;

D O I：

10.1038/ncomms7865

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：

Delivery of high capacity with good retention is a challenge in developing cathodes for rechargeable sodium-ion batteries. Here we present a radially aligned hierarchical columnar structure in spherical particles with varied chemical composition from the inner end (Na[Ni0.75Co0.02Mn0.23]O-2) to the outer end (Na[Ni0.58Co0.06Mn0.36]O-2) of the structure. With this cathode material, we show that an electrochemical reaction based on Ni2+/3+/4+ is readily available to deliver a discharge capacity of 157 mAh (g-oxide)(-1) (15 mA g(-1)), a capacity retention of 80% (125 mAh g(-1)) during 300 cycles in combination with a hard carbon anode, and a rate capability of 132.6 mAh g(-1) (1,500 mA g(-1), 10 degrees C-rate). The cathode also exhibits good temperature performance even at -20 degrees C. These results originate from rather unique chemistry of the cathode material, which enables the Ni redox reaction and minimizes the surface area contacting corrosive electrolyte.

引用

页数：9

共 47 条

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