A Water Stable, Near-Zero-Strain O3-Layered Titanium-Based Anode for Long Cycle Sodium-Ion Battery

被引:46
作者
Cao, Yang [1 ]
Zhang, Qing [1 ]
Wei, Yaqing [1 ]
Guo, Yanpeng [1 ]
Zhang, Zewen [2 ]
Huang, William [2 ]
Yang, Kaiwei [3 ]
Chen, Weihua [3 ]
Zhai, Tianyou [1 ]
Li, Huiqiao [1 ]
Cui, Yi [2 ]
机构
[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China
[2] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA
[3] Zhengzhou Univ, Coll Chem & Mol Engn, Zhengzhou 450001, Henan, Peoples R China
基金
中国国家自然科学基金;
关键词
layered structure; long cycle; sodium-ion battery; Ti-based anode; water stable; INSERTION; MOISTURE;
D O I
10.1002/adfm.201907023
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Layered transition metal (TM) oxides of the stoichiometry NaxMO2 (M = TM) have shown great promise in sodium-ion batteries (SIBs); however, they are extremely sensitive to moisture. To date, most reported titanium-based layered anodes exhibit a P2-type structure. In contrast, O3-type compounds are rarely investigated and their synthesis is challenging due to their higher percentage of unstable Ti3+ than the P2 type. Here, a pure phase and highly crystalline O3-type Na0.73Li0.36Ti0.73O2 with high performance is successfully proposed in SIBs. This material delivers a reversible capacity of 108 mAh g(-1) with a stable and safe potential of 0.75 V versus Na/Na+. In situ X-ray diffraction reveals that this material does not undergo any phase transitions and exhibits a near-zero volume change upon Na+ insertion/de-insertion, which ensures exceptional long cycle life over 6000 cycles. Importantly, it is found that this O3-Na0.73Li0.36Ti0.73O2 shows superior moisture stability, even when immersed into water, which are both elusive for conventional layered TM oxides in SIBs. It is believed that the small interlayer distance and high occupation of interlayer vacancy promise such unprecedented water stability.
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页数:8
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