富锂锰基Li1.2[Co0.13Ni0.13Mn0.54]O2锂离子正极材料的磷改性研究  

Phosphorus modification of Li-rich and Mn-based Li 1.2[Co 0.13 Ni 0.13 Mn 0.54]O 2 cathode materialfor lithium-ion battery

作　　者：班丽卿[1,2] 高敏 庞国耀[1,2] 柏祥涛 李钊[1,2] 庄卫东 BAN Li-qing;GAO Min;PANG Guo-yao;BAI Xiang-tao;LI Zhao;ZHUANG Wei-dong(General Research Institute for Nonferrous Metals,Beijing 100088,China;China Automotive BatteryResearch Institute Co.,Ltd.,Beijing 101400,China)

机构地区：[1]北京有色金属研究总院,北京100088 [2]国联汽车动力电池研究院有限责任公司,北京101400

出　　处：《材料工程》2020年第7期103-110,共8页Journal of Materials Engineering

基　　金：国家自然科学基金-联合基金(U1764255);北京市自然科学基金(L182023)。

摘　　要：为提高高比容量的层状富锂锰基Li1.2[Co0.13Ni0.13Mn0.54]O2材料的电化学性能,对材料添加了不同含量的NH4H2PO4,并对其进行相关研究。主要是对原样和改性后的材料进行X射线衍射(XRD)、高分辨透射电镜(HRTEM)等物理化学性能测试,以及电化学阻抗谱(EIS)、首次充放电性能和倍率性能等电化学性能测试。结果表明:添加0.3%(质量分数,下同)磷元素材料(LMNCOP-03)的综合性能最优,首次放电比容量为280 mAh·g^-1,1 C容量为212.2 mAh·g^-1,3 C容量为170.6 mAh·g^-1。同时EIS测试表明引入0.3%磷的材料具有较低的表面阻抗Rsf和电荷传递电阻Rct。The enhanced electrochemical performance of the lithium-rich solid solution Li 1.2[Co 0.13 Ni 0.13 Mn 0.54]O 2(LMNCO)cathode was enhanced by phosphorus incorporation.The various phosphorus contents were introduced by adding NH 4H 2PO 4 into the raw materials.The pristine sample and the sulfur incorporated samples were characterized by X-ray diffraction(XRD),high resolution transmission electron microscopy(HRTEM),electrochemical impedance spectroscopy(EIS).Electrochemical performance was assessed by measuring parameters such as charge and discharge capacity,rate capability in lithium ion cells.The results show that the LMNCOP-03 material has the best initial discharge capacity of 280 mAh·g^-1.Moreover,it has about 212.2 mAh·g^-1 and 170.6 mAh·g^-1 at 1.0 C and 3.0 C rate,respectively.The LMNCOP-03 material shows an improved rate performance attributed to the enhanced electrical conductivity and lithium ion diffusion,which is proved by EIS tests.

关 键 词：锂离子电池 富锂锰基材料 改性 磷 倍率性能 

分 类 号：O646.21[理学—物理化学] TM912.9[理学—化学]