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Design and Synthesis of Layered Na2Ti3O7 and Tunnel Na2Ti6O13 Hybrid Structures with Enhanced Electrochemical Behavior for Sodium‐Ion Batteries
Advanced Science ( IF 14.3 ) Pub Date : 2018-07-01 , DOI: 10.1002/advs.201800519 Chunjin Wu 1 , Weibo Hua 1 , Zheng Zhang 1 , Benhe Zhong 1 , Zuguang Yang 1 , Guilin Feng 1 , Wei Xiang 1 , Zhenguo Wu 1 , Xiaodong Guo 1
Advanced Science ( IF 14.3 ) Pub Date : 2018-07-01 , DOI: 10.1002/advs.201800519 Chunjin Wu 1 , Weibo Hua 1 , Zheng Zhang 1 , Benhe Zhong 1 , Zuguang Yang 1 , Guilin Feng 1 , Wei Xiang 1 , Zhenguo Wu 1 , Xiaodong Guo 1
Affiliation
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A novel complementary approach for promising anode materials is proposed. Sodium titanates with layered Na2Ti3O7 and tunnel Na2Ti6O13 hybrid structure are presented, fabricated, and characterized. The hybrid sample exhibits excellent cycling stability and superior rate performance by the inhibition of layered phase transformation and synergetic effect. The structural evolution, reaction mechanism, and reaction dynamics of hybrid electrodes during the sodium insertion/desertion process are carefully investigated. In situ synchrotron X‐ray powder diffraction (SXRD) characterization is performed and the result indicates that Na+ inserts into tunnel structure with occurring solid solution reaction and intercalates into Na2Ti3O7 structure with appearing a phase transition in a low voltage. The reaction dynamics reveals that sodium ion diffusion of tunnel Na2Ti6O13 is faster than that of layered Na2Ti3O7. The synergetic complementary properties are significantly conductive to enhance electrochemical behavior of hybrid structure. This study provides a promising candidate anode for advanced sodium ion batteries (SIBs).
中文翻译：
具有增强钠离子电池电化学行为的层状Na2Ti3O7和隧道Na2Ti6O13杂化结构的设计与合成
提出了一种有前途的阳极材料的新型补充方法。提出、制备并表征了具有层状Na 2 Ti 3 O 7和隧道Na 2 Ti 6 O 13混合结构的钛酸钠。通过抑制层状相变和协同效应，杂化样品表现出优异的循环稳定性和优越的倍率性能。仔细研究了混合电极在钠插入/脱离过程中的结构演变、反应机制和反应动力学。进行原位同步加速器X射线粉末衍射（SXRD）表征，结果表明Na +嵌入隧道结构中并发生固溶反应，并嵌入Na 2 Ti 3 O 7结构中并在低电压下出现相变。反应动力学表明隧道Na 2 Ti 6 O 13的钠离子扩散速度快于层状Na 2 Ti 3 O 7的钠离子扩散速度。协同互补特性对于增强混合结构的电化学行为具有显着的促进作用。这项研究为先进钠离子电池（SIB）提供了一种有前途的候选阳极。
更新日期：2018-07-01
中文翻译：
具有增强钠离子电池电化学行为的层状Na2Ti3O7和隧道Na2Ti6O13杂化结构的设计与合成
提出了一种有前途的阳极材料的新型补充方法。提出、制备并表征了具有层状Na 2 Ti 3 O 7和隧道Na 2 Ti 6 O 13混合结构的钛酸钠。通过抑制层状相变和协同效应，杂化样品表现出优异的循环稳定性和优越的倍率性能。仔细研究了混合电极在钠插入/脱离过程中的结构演变、反应机制和反应动力学。进行原位同步加速器X射线粉末衍射（SXRD）表征，结果表明Na +嵌入隧道结构中并发生固溶反应，并嵌入Na 2 Ti 3 O 7结构中并在低电压下出现相变。反应动力学表明隧道Na 2 Ti 6 O 13的钠离子扩散速度快于层状Na 2 Ti 3 O 7的钠离子扩散速度。协同互补特性对于增强混合结构的电化学行为具有显着的促进作用。这项研究为先进钠离子电池（SIB）提供了一种有前途的候选阳极。
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