Al、Mn共掺杂高镍正极材料电化学性能研究

Study on electrochemical properties of Al and Mn co-doping high nickel cathode materials

高镍正极材料形貌受合成体系中Mn和Al的影响比较大。采用简单的共沉淀方法合成出正极材料前驱体[Ni_(0.8)Co_(0.15)](OH)_(1.9),在烧结过程中同时引入不同比例的Al、Mn离子,以其协同作用共同实现材料的稳定层状结构,提高材料循环稳定性,从而改善材料的电化学性能。结果显示:在800℃烧结条件下,当Mn和Al的掺杂量同为0.025时,制备出的锂离子电池正极材料Li(Ni_(0.8)Co_(0.15)Mn_(0.025)Al_(0.025))O_(2)电化学性能最佳。具体体现为:在0.1 C放电比容量达到190.3 mAh/g,在20 C放电比容量达到100.2 mAh/g。

The morphology of high nickel cathode material is greatly affected by Mn and Al in the synthesis system.The precursor of cathode material[Ni_(0.8)Co_(0.15)](OH)_(1.9) was synthesized by simple co-precipitation method.Herein,we simultaneously introduced Al and Mn in the sintering process to achieve a stable layered structure of the cathode material with a synergistic effect.This method improved the cycle stability of the material structure,thereby improving the electrochemical performance.The results show that with the doping amount of Mn and Al is 0.025,the prepared lithium ion cathode material Li(Ni_(0.8)Co_(0.15)Mn_(0.025)Al_(0.025))O_(2)calcined at 800℃,the electrochemical performance is the best.Specifically,the discharge specific capacity(0.1 C)reaches to 190.3 mAh/g,and 100.2 mAh/g at 20 C.