纳米CoOOH颗粒的合成及其作为锂离子电池负极材料的研究

The synthesis of nano-CoOOH as anode electrode materials for rechargeable Li-ion batteries

以CoSO4·6H2O和NaOH为原料,采用共沉淀法,在一定温度下反应一段时间得到深棕色产物.利用X射线衍射(XRD),透射电镜(TEM),热分析(TG-DTA),恒流充放电测试等方法对所产物结构,形貌,大小等进行分析表征及电化学性能测试.实验结果表明,产物为分散均匀的200nm CoOOH颗粒,且该材料作为锂离子电池负极材料,首圈放电容量达到2 100mAh·g-1,循环20圈后,放电容量保持800mAh·g-1.此方法合成的纳米尺寸的CoOOH作为锂离子电池负极材料具有较好的电化学性能.

Nano-CoOOH was synthesized by co-precipitation method using COSO4 . 6H2O and NaOH as resources and characterized by X-ray diffraction （XRD）, transmis- sion electron microscope （TEM）, and the thermogravimetric （TG-DTA）. The electro- chemical properties as the anode electrode materials for lithium ion batteries were stud- ied by charge-discharge method. The results showed that the sizes of Nano-CoOOH par- ticles could be well controlled. When used as the anode materials for lithium ion batter- ies, the discharge capacity of the first cycle could reach as high as 2100 mAh. g-1 and finally stabilize at about 800 mAh . g-1 after 20 cycles. These results showed that this material could be one of the candidates for the negative materials.