Hierarchical architecture of porous anatase TiO₂ microspheres is obtained by a universal solvothermal reaction, which can improve the cycling stability and ionic/electronic transport properties in sodium-ion batteries without further coating, carbon modification, or element doping. Meanwhile, through combining the porous structure with an ether-based electrolyte, the electrochemical properties of this material have been significantly enhanced. A great specific capacity of 207.3 mA h g^–1 at 1 C (168 mA g^–1) after 250 cycles can be achieved. Even at an unimaginable current density of 40 C, an outstanding cycle life was achieved with a capacity of 140.6 mA h g^–1 over 10000 cycles. Furthermore, in situ Raman spectroscopy and ex situ XRD pattern analyses were carried out to explore the structural transformation in the first cycling process.

中文翻译：

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具有高速率和长期循环稳定性的分层多孔锐钛矿型TiO ₂微球，用于醚基电解质中的钠存储

多孔锐钛矿型TiO ₂微球的层级结构是通过通用溶剂热反应获得的，无需进一步涂覆，碳修饰或元素掺杂，即可改善钠离子电池的循环稳定性和离子/电子传输性能。同时，通过将多孔结构与基于醚的电解质结合，该材料的电化学性能得到了显着提高。250个循环后，在1 C（168 mA g ^–1）下可实现207.3 mA hg ^–1的大比容量。即使在40 C的不可思议的电流密度下，其出色的循环寿命也达到了140.6 mA hg ^–1的容量。超过10000个周期。此外，进行了原位拉曼光谱和异位XRD图谱分析，以探索第一个循环过程中的结构转变。