制备层状LiMnO_2的水热合成法工艺优化

Optimized process of layered LiMnO_2 preparation by hydrothermal synthesis method

正交层状锰酸锂(o-LiMnO_2)是高能量密度锂离子电池正极材料之一,是当前的研究热点。利用水热合成法制备层状锰酸锂,颗粒细小,形状均匀,更利于电池的装填。但是,水热法制备锰酸锂需要在较高的锂锰比下进行,造成了锂资源的浪费,也阻碍了工业化生产的进行。在水热合成过程中通过添加氨水,成功地在低锂锰比条件下制备出o-LiMnO_2,该工艺对o-LiMnO_2的工业化生产具有重大指导意义。

Layered orthogonal LiMnO2, a hot spot in current research, is a key cathode material for the high energy density lithium ion battery. The particles of layered LiMnO2 by hydrothermal synthesis method are tiny and uniform in shape, which is more conducive to battery filling. However, the preparation of LiMnO2 by hydrothermal method needs to be carried out at a higher mole rate of lithium and manganese, resulting in the waste of lithium and hindering the industrialization. In the process of hydrothermal synthesis, o-LiMnO2 was successfully prepared by adding ammonia water under the condition of low lithium manganese ratio. This process has great guiding significance for the industrialization of o-LiMnO2.