Hwang, Jang-Yeon Oh, Seung-Min Myung, Seung-Taek Chung, Kyung Yoon Belharouak, Ilias Sun, Yang-Kook 2024-01-20T07:31:09Z 2024-01-20T07:31:09Z 2021-09-05 2015-04 2041-1723 https://pubs.kist.re.kr/handle/201004/125605 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. English NATURE PUBLISHING GROUP LOW-TEMPERATURE PERFORMANCE HIGH-CAPACITY ELECTROCHEMICAL INTERCALATION ELECTRODE PERFORMANCE POSITIVE ELECTRODE NAXCOO2 P2-TYPE NACRO2 ANODE POWER Radially aligned hierarchical columnar structure as a cathode material for high energy density sodium-ion batteries Article 10.1038/ncomms7865 1 NATURE COMMUNICATIONS, v.6 NATURE COMMUNICATIONS 6 scie scopus 000353703400032 2-s2.0-84928109569 Multidisciplinary Sciences Science & Technology - Other Topics Article LOW-TEMPERATURE PERFORMANCE HIGH-CAPACITY ELECTROCHEMICAL INTERCALATION ELECTRODE PERFORMANCE POSITIVE ELECTRODE NAXCOO2 P2-TYPE NACRO2 ANODE POWER Chemical sciences Materials science Physical chemistry