合成方法对LiNi1／3Co1／3Mn1／3O2性能的影响

Effects of synthesis method on the performance of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2

采用高温固相法、溶胶．凝胶法和碳酸盐共沉淀法分别制备了锂离子电池层状正极材料LiNi1／3Co1／3Mn1／3O2。采用XRD、SEM、粒径分布和充放电实验，对产物的结构和性能进行了分析。结果表明，合成方法和工艺条件的不同导致了样品晶相结构、表观形貌、粒径分布及电化学性能上的差异。碳酸盐共沉淀法制备的LiNi1／3Co1／3Mn1／3O2样品的电化学性能较好，在2．5—4．6V、0．1G倍率下，首次放电比容量为190．29mAh／g，显示了较好的循环稳定性。

The layered cathode materials LiNi1/3Co1/3Mn1/3O2 for Li-ion battery were synthesized by high temperature sol/d-state method, sol-gel method and carbonate co-precipitation method, respectively. The materials were analyzed by XRD, SEM, grain size distribution and charge/discharge experiments. The results showed that the difference in preparation methods and technique conditions resulted in the difference in crystal structure and apparent morphology, grain size distribution and electrochemical performance. The LiNi1/3Co1/3Mn1/3O2 cathode synthesized by carbonate co-precipitation method exhibited better electrochemical performance. Its initial specific discharge capacity was 190.29 mAh/g （2.5 - 4.6 V ,0.1 C rate） ,showed better cycle stability.