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An Ultrastable Anode for Long‐Life Room‐Temperature Sodium‐Ion Batteries
Author(s) -
Yu Haijun,
Ren Yang,
Xiao Dongdong,
Guo Shaohua,
Zhu Yanbei,
Qian Yumin,
Gu Lin,
Zhou Haoshen
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201404549
Subject(s) - anode , energy storage , sodium , materials science , ion , oxide , electrode , chemical engineering , chemistry , metallurgy , engineering , power (physics) , physics , organic chemistry , quantum mechanics
Sodium‐ion batteries are important alternative energy storage devices that have recently come again into focus for the development of large‐scale energy storage devices because sodium is an abundant and low‐cost material. However, the development of electrode materials with long‐term stability has remained a great challenge. A novel negative‐electrode material, a P2‐type layered oxide with the chemical composition Na 2/3 Co 1/3 Ti 2/3 O 2 , exhibits outstanding cycle stability (ca. 84.84 % capacity retention for 3000 cycles, very small decrease in the volume (0.046 %) after 500 cycles), good rate capability (ca. 41 % capacity retention at a discharge/charge rate of 10 C), and a usable reversible capacity of about 90 mAh g −1 with a safe average storage voltage of approximately 0.7 V in the sodium half‐cell. This P2‐type layered oxide is a promising anode material for sodium‐ion batteries with a long cycle life and should greatly promote the development of room‐temperature sodium‐ion batteries.