title: An ultrastable anode for long-life room-temperature sodium-ion batteries.
abstract: 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)O2, 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.
authors: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8568 (Japan).
authors: Haijun
authors: H
authors: Yu
authors: Yang
authors: Y
authors: Ren
authors: Dongdong
authors: D
authors: Xiao
authors: Shaohua
authors: S
authors: Guo
authors: Yanbei
authors: Y
authors: Zhu
authors: Yumin
authors: Y
authors: Qian
authors: Lin
authors: L
authors: Gu
authors: Haoshen
authors: H
authors: Zhou
keywords: anode materials; electrochemistry; sodium storage; sodium-ion batteries