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以六亚甲基四胺(HMT)为导向剂,通过水热法,在不同温度下合成了六边形薄片状的高取向三元前驱体NixCoyMn1-x-y(OH)2,采用氯化钾与氯化钠的混合熔盐法对前驱体进行煅烧后得到高取向富锂正极材料。经X射线衍射、扫描电镜等表征,材料具有良好的层状结构,在(003)晶面具有很高的择优取向。电化学测试结果表明,在0.1 C倍率下(20 m A/g),材料的首次放电容量为282.5 m A·h/g;1 C倍率下经30次循环放电容量从195.7 m A·h/g降至178.8 m A·h/g,容量保持率为91.4%;当倍率分别为2 C和5 C时,材料的放电容量分别为150.6 m A·h/g和110.0 m A·h/g。材料具有良好的循环稳定性和倍率性能。
Hexamethylenetetramine (HMT) as the directing agent, hexagonal flaky highly oriented ternary precursor NixCoyMn1-xy (OH) 2 was synthesized by hydrothermal method at different temperatures, Sodium chloride mixed molten salt method after calcination of the precursor to obtain highly oriented lithium-rich cathode material. The X-ray diffraction and scanning electron microscopy showed that the material has a good layered structure and a high preferred orientation at the (003) plane. The results of electrochemical tests show that the initial discharge capacity of the material is 282.5 mA · h / g at 0.1 C rate (20 m A / g), and the discharge capacity of the material after 195 cycles is 195.7 mA · h / g to 178.8 m A · h / g, and the capacity retention was 91.4%. When the magnifications were 2 C and 5 C, the discharge capacities of the materials were 150.6 m A · h / g and 110.0 m A · h / g, respectively . The material has good cycle stability and rate performance.