钛酸锂合成技术研究进展

钛酸锂是一种尖晶石结构的锂离子电池负极材料,相对于碳基材料具有更好的充放电性能、循环稳定性和使用安全性能,成为研究新型锂电子电池负极材料的热点。然而,钛酸锂本身存在电导率较低,极化现象严重和理论容量小等缺点,限制了其广泛应用。介绍了钛酸锂的合成技术、原理,改进方法及研究现状。分析了不同制备工艺的优缺点及其对材料性能的影响。指出元素掺杂、表面包覆、形貌设计和复合改性等方式可有效改善Li4Ti5O12材料的导电性能,提高材料的电化学性能。提出了目前存在的问题及未来的研究方向。

Research progress in synthesis technology of lithium titanate

The spinel lithium titanate has become one of promising anode materials for its excellent cycling stability, high rate capability, and reliable safety performance compared with graphite anode. However, the poor conductivity, serious polarization, and low theoretical specific capacity impede its commercial application. The synthesis methods, principle, modified technologies and current research states of lithium titanate were reviewed. The doping and coating of metal element, morphology design and complex modification have been considered as effective ways to enhance electronic conductivity and improve the electrochemistry properties, and the existing problems and the further research and development are proposed.