Safe fast-charging lithium-ion batteries (LIBs) have huge potential market size on demand according to their shortened charging time for high-power devices. Zero-strain spinel Li4Ti5O12 is one of ideal candidates for safe high-power batteries owing to its good cycling performance, low cost and safety. However, the inherent insulating characteristic of LTO seriously limits its high-rate capability. In this work, we successfully synthesize novel wavelike spinel LTO nanosheets using a facile ‘co-hydrolysis’ method, which is superior to molten-salt approach and traditional solvothermal method in some respects. The unique 2D structures have single-crystal framework with shortened path for Li ion transport. As a result, the N-doped 2D wavelike LTO with 0.6 wt.% of ‘carbon joint’ not only exhibits exciting capacity of ~180 and ~150 mA h g−1 for fast lithium storage at high discharge/charge rates of 1.7 and 8.5 A g−1 (10C and 50C) respectively, but also shows excellent low-temperature performance at −20°C. In addition, the cost may be further decreased due to recycled functional reagents. This novel nanostructured 2D LTO anode material makes it possible to develop safe fast-charging high-power lithium ion batteries.
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机译：安全的快速充电锂离子电池（LIB）由于缩短了对大功率设备的充电时间，因此具有巨大的潜在市场需求。零应变尖晶石Li4Ti5O12具有良好的循环性能，低成本和安全性，因此是安全的大功率电池的理想选择之一。但是，LTO的固有绝缘特性严重限制了其高倍率能力。在这项工作中，我们成功地使用了一种简便的“共水解”方法成功合成了新型波状尖晶石LTO纳米片，在某些方面它优于熔融盐法和传统的溶剂热法。独特的2D结构具有单晶框架，缩短了Li离子传输的路径。结果，具有0.6 wt。％的“碳键”的N掺杂二维波状LTO不仅表现出〜180和〜150 mA hg -1 的激发容量，可以在高放电时快速存储锂/充电速率分别为1.7和8.5 A g -1 （10C和50C），但在-20°C时也显示出优异的低温性能。另外，由于回收了功能试剂，成本可以进一步降低。这种新颖的纳米结构二维LTO阳极材料使开发安全的快速充电大功率锂离子电池成为可能。
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