ZrO_2包覆富锂正极材料Li[Li_(0.2)Ni_(0.2)Mn_(0.6)]O_2  

Modification of ZrO_2-Coated Li[Li_(0. 2)Ni_(0. 2)Mn_(0. 6)]O_2

作　　者：苏银利[1] 王丹[2] 陈丽[2] 单忠强[3] 

机构地区：[1]天津巴莫科技股份有限公司,天津300072 [2]天津大学理学院,天津300072 [3]天津大学化工学院,天津300072

出　　处：《化学工业与工程》2015年第4期30-33,共4页Chemical Industry and Engineering

摘　　要：采用共沉淀-高温固相法制备了富锂正极材料Li[Li0.2Ni0.2Mn0.6]O2,并使用Zr（OC3H7）4进行了Zr O2包覆改性。通过X射线粉末衍射（XRD）、透射电子显微镜（TEM）和电化学测试手段讨论了Zr O2包覆对材料的结构、形貌和电化学性能的影响。Zr O2能均匀覆盖在Li[Li0.2Ni0.2Mn0.6]O2颗粒表面,包覆后材料的电化学性能有一定的改善。包覆质量分数0.5%的Zr O2样品表现了提高的循环和倍率性能。首次放电容量（0.1 C,2.0~4.8 V）高达250.8 m Ah·g^-1,循环45周（0.2C）容量保持为201.6 m Ah·g^-1,2.0 C倍率放电容量可达123.2 m Ah·g^-1。The Li-rich layered Li[Li0. 2Ni0. 2Mn0. 6]O2was prepared by co-precipitation and solid state reaction method,then coated with Zr O2（ Zr（ OC3H7）4as coating source）. The X-ray diffraction（ XRD）,transmission electron microscope（ TEM） techniques,and galvanostatic charge-discharge tests were used to investigate the effect of Zr O2 coating on the crystal structures,morphology and electrochemical performance of Li-rich material Li[Li0. 2Ni0. 2Mn0. 6]O2. The results showed that Zr O2 particles was homogeneously covered on the surface of Li[Li0. 2Ni0. 2Mn0. 6]O2,and the electrochemical performance was improved after Zr O2 coating,the 0. 5% Zr O2 coated sample exhibited superior cycle performance and rate capability among the samples,The 0. 5% Zr O2-coated Li[Li0. 2Ni0. 2Mn0. 6]O2sample delivered initial discharge capacity of 250. 8 m Ah·g- 1at 20 m A·g^-1（ 0. 1 C） in the range of 2. 0 to 4. 8 V,the discharge capacity maintained 201. 6 m Ah·g^-1after 45 cycles at 0. 2 C,and the discharge capacity at 2. 0 C rate attained123. 2 m Ah·g^-1.

关 键 词：锂离子电池 富锂正极材料 层状结构 ZrO2包覆 电化学性能 

分 类 号：O646.541[理学—物理化学]