ABSTRACT Li4Ti5O12 (LTO) is one of the most promising high-power anodes for lithium ion batteries, but its large-current performance is still undermined due to relatively poor ion/electron transfer. In this work, we report a powerful hydrothermal method for fabrication of highly porous binder-free Li4Ti5O12 films, which show hierarchical structure composed of interconnected primary nanoparticles of 50-100 nm and secondary nanowalls. The lithium ion storage performance of designed Li4Ti5O12 films is thoroughly studied and demonstrated with excellent high-rate performance. The as-prepared Li4Ti5O12 films exhibit a high specific capacity of 146 mAh g-1 at the current density of 2 C. In view of good structural stability, a notable cycling stability is verified with a specific capacity of 130 mAh g-1 after 5000 cycles at 2 C. Our method provides a novel route for synthesis of other advanced anodes for application in the field of ultrafast energy storage. Graphical abstract Highly porous binder-free Li4Ti5O12 films are synthesised via a hydrothermal method and exhibit a noticeable high-rate electrochemical performance as the anode of lithium ion batteries.

中文翻译：

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高度多孔的 Li4Ti5O12 薄膜作为用于快速锂离子存储的高倍率电极

摘要 Li4Ti5O12（LTO）是最有前途的锂离子电池大功率负极之一，但由于离子/电子转移相对较差，其大电流性能仍然受到削弱。在这项工作中，我们报告了一种强大的水热方法，用于制造高度多孔的无粘合剂 Li4Ti5O12 薄膜，该薄膜显示出由相互连接的 50-100 nm 初级纳米粒子和次级纳米壁组成的分层结构。对设计的 Li4Ti5O12 薄膜的锂离子存储性能进行了深入研究，并以优异的高倍率性能进行了证明。所制备的 Li4Ti5O12 薄膜在 2 C 的电流密度下表现出 146 mAh g-1 的高比容量。 鉴于良好的结构稳定性，5000 年后比容量为 130 mAh g-1 验证了显着的循环稳定性在 2 C 下循环。我们的方法为合成其他用于超快储能领域的先进阳极提供了一条新途径。图形摘要 高度多孔的无粘合剂 Li4Ti5O12 薄膜是通过水热法合成的，作为锂离子电池的阳极表现出显着的高倍率电化学性能。