采用共沉淀-高温固相烧结法,控制合成条件,以不同的沉淀剂（Na2CO3、NaOH）制备出正极材料。通过XRD、SEM及电池测试系统对不同沉淀剂制备的正极材料进行结构、形貌和电化学性能的表征,对比两者存在的优缺点。研究结果表明,以NaOH为沉淀剂制备的正极材料有更好的层状结构,形貌也更好,充放电性能和倍率性能也较好。其首次放电比容量达到了187.9mAh/g,最高可达196.2mAh/g,50次充放电循环后,容量保持率为81.6%;以Na2CO3为沉淀剂制备的正极材料的放电比容量较低,但容量保持率较高,为85.3%。
In this article,cathode materials were synthesized via co-precipitation with different precipitants（Na2CO3,NaOH） followed by sintering process.XRD,SEM and electrochemical tests were used to characterize the microstructure,morphology and electrochemical properties of the obtained cathode materials.The results indicated that the cathode material synthesized by NaOH exhibits better layer structure,morphology,charge-discharge performance and rate performance.Its first specific discharge capacity is about 187.9mAh/g,the highest reaches 196.2mAh/g,and the capacity retention rate is about 81.6% after 50 cycles.The cathode material,prepared by Na2CO3,has a lower specific discharge capacity,but has a higher capacity retention rate about 85.3% after 50 cycles.
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