锂离子电池正极材料LiNi_(0.85)Co_(0.10)(TiMg)_(0.025)O_2合成及表征

Preparation and Characterization of LiNi_(0.85)Co_(0.10)(TiMg)_(0.025)O_2 as Cathode Materials for Lithium-ion Batteries

以LiOH·H2O、Ni2O3、Co2O3、TiO2和Mg(OH)2为原料,应用固相反应法合成Co-Ti-Mg共掺杂的LiNiO2化合物LiNi0.85Co0.10(TiMg)0.025O2;TG-DTA、XRD、SEM和电化学测试表明,该材料首次放电容量达182.7 mAh/g(3.0～4.3 V,18 mA/g),10次循环之后,容量还有175.5 mAh/g,容量保持率为96.2%;与未掺杂的LiNiO2相比,该材料显示出良好的循环性能,是一种很有应用前景的锂电池正极材料.

Cathode material of LiNi_(0.85)Co_(0.10)(TiMg)_(0.025)O_2 were prepared by solid state reaction at 725℃ for 24 h from LiOH·H_2O, Ni_2O_3, Co_2O_3, TiO_2 and Mg(OH)_2 under flowing oxygen, and were characterized by TG-DTA, XRD, SEM and electrochemical tests. Effort to simultaneously doped LiNiO_2 with Co-Ti-Mg has been tried to improve the cathode performance. The results show that co-doping definitely has a large beneficial effect in increasing the capacity (182.7mAh/g of the first discharge capacity for LiNi_(0.85)Co_(0.10)(TiMg)_(0.025)O_2) and cycling behavior (175.5 mAh/g after 10 cycles). This cathode materials can be applied for lithium-ion batteries.