Microstructural control of new intercalation layered titanoniobates with large and reversible d-spacing for easy Na(+) ion uptake.
Microstructural control of new intercalation layered titanoniobates with large and reversible d-spacing for easy Na(+) ion uptake.
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DOI：
10.1126/sciadv.1700509
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发表时间：
2017-10
期刊：
影响因子：
13.6
通讯作者：
Paik U
中科院分区：
文献类型：
--
作者：
Park H;Kwon J;Choi H;Song T;Paik U
H0.43Ti0.93Nb1.07O5具有大的d间距约8.3ä和二维离子通道，可轻松吸收Na+离子。钠离子电池的关键问题是开发具有良好插入/脱嵌位置的电极材料，以及由于其较高的活化能和较差的电化学可逆性而对反应机理的理解。我们首次报道了层状H0.43Ti0.93Nb1.07O5作为一种新的负极材料。这种负极材料被设计成具有优势的(200)和(020)晶面，具有足够大的d间距~8.3ä，以及易于吸收Na+离子的二维离子通道，这导致在Na插入(放电)时沿c方向的小体积膨胀~0.6ä，并在[020]面上的最低能垒为0.19 eV。该材料对1.7Na离子(~200mAhg−1)的插层和脱嵌是可逆的，在相对于Na/Na+的0.0 1~3.0V的电势窗口内没有容量衰减。钠的插入/取出是通过固溶体反应进行的，没有相分离，这防止了循环过程中微观结构中的一致应变或应力，并确保了良好的钠存储性能。这些发现表明，H0.43Ti0.93Nb1.07O5作为阳极具有很大的潜力，我们的策略也可以应用于其他层状金属氧化物，具有良好的钠存储性能。
H0.43Ti0.93Nb1.07O5 engineered with large d-spacing of ~8.3 Å and two-dimensional ionic channels enables easy Na+ ion uptake. Key issues for Na-ion batteries are the development of promising electrode materials with favorable sites for Na+ ion intercalation/deintercalation and an understanding of the reaction mechanisms due to its high activation energy and poor electrochemical reversibility. We first report a layered H0.43Ti0.93Nb1.07O5 as a new anode material. This anode material is engineered to have dominant (200) and (020) planes with both a sufficiently large d-spacing of ~8.3 Å and two-dimensional ionic channels for easy Na+ ion uptake, which leads to a small volume expansion of ~0.6 Å along the c direction upon Na insertion (discharging) and the lowest energy barrier of 0.19 eV in the [020] plane among titanium oxide–based materials ever reported. The material intercalates and deintercalates reversibly 1.7 Na ions (~200 mAh g−1) without a capacity fading in a potential window of 0.01 to 3.0 V versus Na/Na+. Na insertion/deinsertion takes place through a solid-solution reaction without a phase separation, which prevents coherent strain or stress in the microstructure during cycling and ensures promising sodium storage properties. These findings demonstrate a great potential of H0.43Ti0.93Nb1.07O5 as the anode, and our strategy can be applied to other layered metal oxides for promising sodium storage properties.
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影响因子：
3.2
作者：
DELMAS, C;BRACONNIER, JJ;HAGENMULLER, P
通讯作者：
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影响因子：
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作者：
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作者：
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27.8
作者：
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通讯作者：
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影响因子：
41.2
作者：
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通讯作者：
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