尿素共沉淀法制备LiNi_(0.8)Co_(0.2)O_2正极材料及其电化学性能

Synthesis and Electrochemical Performance of LiNi_(0.8)Co_(0.2)O_2 Cathode Material by Co-precipitation Using Urea

采用尿素共沉淀法合成了LiNi0.8Co0.2O2锂离子电池正极材料,研究了烧结温度、锂源摩尔配比对LiNi0.8Co0.2O2晶形结构、形貌以及电化学性能的影响。结果表明,尿素共沉淀法合成LiNi0.8Co0.2O2样品最佳工艺条件是800℃温度条件下烧结10 h、锂过量5%合成的样品具有较好的电化学性能,以0.2 C倍率充放电时首次充放电容量分别为206.4 mAh·g-1和191.6 mAh·g-1,循环30次后容量为178.2 mAh·g-1。

The cathode material LiNi0. 8Co0. 2O2 was synthesized by co-precipitation using urea. The influence of different methods and synthesis conditions on the physical and electrochemical performance of LiNi0. 8Co0. 2Mn0. 2O2 was analyzed,and the synthesis conditions were optimized. The optimum conditions of synthesis LiNi0. 8Co0. 2O2 were sintered at 800 ℃ for 10 h,and the electrochemical performance of the sample was excellent. Its first charge and discharge capacity was 206. 4 mAh·g- 1and 191. 6 mAh·g- 1,the capacity retained 178.2 mAh·g- 1after 30 cycles.