超声共沉淀法合成锂离子电池正极材料

采用超声共沉淀法,合成尖晶石型掺杂锰酸锂Li1.05Co0.10Ni0.10Mn1.80O4前驱体,并使用三段热处理方式,制备出尖晶石产物。用粒度分布、XRD、SEM、EDS及电化学性能测试等对其进行表征。结果表明:与未处理试样相比,超声共沉淀法制备的产物的粒度分布变窄,体积比表面积由7.0116m2/cm3缩小至6.9789m2/cm3,晶格常数从0.822nm缩小至0.821nm,晶粒尺寸从67.41nm减小至57.78nm,晶形更加完整,颗粒均匀性更好。经装配成电池测定电化学性能,其充放电平台增长,比容量加大,循环性能更优越。

Synthesis of Spinel by Supersonic Co-precipitation Method as a Anode for Rechargeable Lithium-ion Battery

The precursors of spinel Li1.05Co0.10Ni0.10Mn1.80O4 were prepared by using co-precipitation method combining with supersonic vibration, and then treated by three-step heat-treatment. The obtained powders were characterized by particle size distribution, XRD, SEM, EDS and electrochemical performance tests. The results show the supersonic treated product, contrast to the untreated one, has a narrower particle size distribution, volumetric surface area reduces from 7.011 6 m2/cm3 to 6.978 9m2/cm3, lattice constant reduces from 0.822 nm to 0.821 nm, grain size reduces from 67.41 nm to 57.78 nm. It has better crystal form and particle uniformity. The supersonic treated powders have a long charge-recharge platform, higher capacity and static cycle life according to the electrochemical performance test.