Amorphous Zr(OH)4 coated LiNi0.915Co0.075Al0.01O2 cathode material with enhanced electrochemical performance for lithium ion batteries

• 来源期刊: 能源化学
• 年，卷（期）: 2017,（3）
• 页码范围: 481-487
• 页数: 7页
• 语种: 英文

摘要

LiNi0.915Co0.075Al0.01O2 (NCA) with Zr(OH)4 coating is demonstrated as high performance cathode material for lithium ion batteries (LIBs).The coated materials are synthesized via a simple dry coating method of NCA with Zr(OH)4 powders,and then characterized with scanning electron microscopy (SEM),transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS).Experimental results show that amorphous Zr(OH)4 powders have been successfully coated on the surface of spherical NCA particles,exhibiting improved electrochemical performance.0.50 wt％ Zr(OH)4 coated NCA delivers a capacity of 197.6 mAh/g at the first cycle and 154.3 mAh/g after 100 cycles with a capacity retention of 78.1％ at 1 C rate.In comparison,the pure NCA shows a capacity of 194.6 mAh/g at the first cycle and 142.5 mAh/g after 100 cycles with a capacity retention of 73.2％ at 1 C rate.Electrochemical impedance spectroscopy (EIS) results show that the coated material exhibits a lower resistance,indicating that the coating layer can efficiently suppress transition metals dissolution and decrease the side reactions at the surface between the electrode and electrolyte.Therefore,surface coating with amorphous Zr(OH)4 is a simple and useful method to enhance the electrochemical performance of NCA-based materials for the cathode of LIBs.