title: A zero-strain layered metal oxide as the negative electrode for long-life sodium-ion batteries.
abstract: Room-temperature sodium-ion batteries have shown great promise in large-scale energy storage applications for renewable energy and smart grid because of the abundant sodium resources and low cost. Although many interesting positive electrode materials with acceptable performance have been proposed, suitable negative electrode materials have not been identified and their development is quite challenging. Here we introduce a layered material, P2-Na0.66[Li0.22Ti0.78]O2, as the negative electrode, which exhibits only ~0.77% volume change during sodium insertion/extraction. The zero-strain characteristics ensure a potentially long cycle life. The electrode material also exhibits an average storage voltage of 0.75 V, a practical usable capacity of ca. 100 mAh g(-1), and an apparent Na(+) diffusion coefficient of 1 × 10(-10) cm(-2) s(-1) as well as the best cyclability for a negative electrode material in a half-cell reported to date. This contribution demonstrates that P2-Na0.66[Li0.22Ti0.78]O2 is a promising negative electrode material for the development of rechargeable long-life sodium-ion batteries.
authors: 1] Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2].
authors: Yuesheng
authors: Y
authors: Wang
authors: Xiqian
authors: X
authors: Yu
authors: Shuyin
authors: S
authors: Xu
authors: Jianming
authors: J
authors: Bai
authors: Ruijuan
authors: R
authors: Xiao
authors: Yong-Sheng
authors: YS
authors: Hu
authors: Hong
authors: H
authors: Li
authors: Xiao-Qing
authors: XQ
authors: Yang
authors: Liquan
authors: L
authors: Chen
authors: Xuejie
authors: X
authors: Huang