以共沉淀法制备的球形Ni_(0.5)Co_(0.3)Mn_(0.2)CO_3粉末为前驱体,按一定的比例将碳酸锂与前驱体混合,然后采用高温固相法合成高振实密度球形LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2正极材料.该材料的振实密度达到2.60 g/cm~3,与商品化LiCoO_2的密度相当.SEM分析表明, LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2正极材料与前驱体形貌有良好的继承性,均为理想的球形.XRD物相分析表明,在不同合成温度下的Li Ni_(0.5)Co_(0.3) Mn_(0.2)O_2产物均为具有α-NaFeO_2层状结构的纯相物质,在较高合成温度下所得材料的结晶度较高.电化学性能研究表明,在2.7～4.3 V的电压范围内,电池的放电比容量在0.2C倍率下为168.1 mA-h/g,在1C倍率下为157.6 mA-h/g;经50次循环后,两种放电条件下的电池容量保持率分别为95.1%和97.2%,显示出良好的电化学性能.
The high tap-density spherical LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 cathode materials were synthesized from coprecipitated Ni_(0.5)Co_(0.3)Mn_(0.2)CO_3 by high-temperature solid-state method. The tap-density of the material is as high as 2.60 g/cm~3, which is similar to commercial LiCoO_2. The SEM results reveal that the LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 cathode material has well kept the spherical morphology of the spherical precursor. The XRD results show that all the LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 samples have high purity phase, and the powders are much better crystallized at higher synthesis temperature. At 2.7-4.3 V, the discharge capacities reach 168.1 and 157.6 mA-h/g at the rates of 0.2C and 1C, respectively. The capacity retentions after 50 cycles at 0.2C and 1C are 95.1% and 97.2%, respectively. This proves that the materials present excellent electrochemical performances.
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